Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1287f9838a1856d…

MALICIOUS

PDF

101.6 KB Created: 2021-05-11 05:36:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 35883b57884da07933f5141d27572d2d SHA-1: d5055317078cd76c73e345d530d1f2c3dff75498 SHA-256: f1287f9838a1856dc4f8c3184f6ffeb3432696d4d2e45f67a6cf888f9d6c698a
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains numerous external links, many pointing to disposable hosting, and one specific URL (https://midufefew.ru/strik?utm_term=how+much+is+a+100+hours) that is likely malicious. Heuristics indicate this is a link farm designed to redirect users, and ClamAV detected it as a phishing trojan. The ML classifier also strongly flagged it as malicious. No scripts were extracted, but the overall structure and URL usage suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9944

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://midufefew.ru/strik?utm_term=how+much+is+a+100+hours PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4485578/normal_6005cf148fbbc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4447086/normal_5fed3504ceb32.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445879/normal_60217ef17e4e4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388825/normal_6034d4ddc72a3.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/xefezesebusu/dressed_to_dazzle_reading_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e29cf5d1-4e82-4001-9bbc-96c9171661d2/18233535891.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f1f31638-2d6f-4753-ad00-5d141b0b176c/jisurivewazanuparukagenad.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a53509a1-5f16-4765-bfd1-aae38107b1a7/cracking_the_sat_practice_test_8_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/kufazete/chemical_to_heat_energy_transformation.pdfIn PDF document text
    • https://83d7d1d1-3661-4158-a2cc-78aa4aa39d08.filesusr.com/ugd/163759_1e3e39104bbc457ba79b6c6d40d1f18a.pdf?index=trueIn PDF document text
    • http://zujetisapapido.rf.gd/orlando_airport_map.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0431d81d-27fe-4f66-a0a8-de5e8b263d7b/how_to_set_kidde_accesspoint_keysafe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9ac1f3d2-13e5-4608-88d3-a30174e5bf53/how_to_clean_top_loader_washing_machine_with_cold_water.pdfIn PDF document text
    • http://nogurinuzelajer.rf.gd/jigaf.pdfIn PDF document text
    • http://newewixojarulup.epizy.com/elastomeric_bearing.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b0b46f07-a225-4040-bca3-090fc5ee5e6f/98220194471.pdfIn PDF document text
    • https://0e627107-309b-4451-a84d-e7064c41fccd.filesusr.com/ugd/04c368_d0299fa2cc2d4a9a8424f3d446de6185.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zuguvoxoki/vuvefufami.pdfIn PDF document text
    • https://s3.amazonaws.com/jujadodedaruxix/58091043548.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3cec9523-c0f7-4b72-9c9c-c360827451b7/wemamagetogolareso.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a2d04abf-a6c1-47d4-9afc-434f8d149121/gafidebup.pdfIn PDF document text
    • https://eac5c218-d238-408c-98a6-8ff0ecbb25fc.filesusr.com/ugd/b1277d_c5d7488122284ec18838aef4936d72d0.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/marimejerebo/xavisusekirupakigovupiku.pdfIn PDF document text
    • http://mivetafo.epizy.com/avengers_endgame_tamil_full_movie_link.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 7

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f400.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF400 6632 bytes
SHA-256: 7492c41e3972d73f62eb963a334729b0112b02a02ef7923fa8519100f8302308
font_01_sfnt_off00010494.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10494 4832 bytes
SHA-256: 89a94372d484e3d49d6294f4c08a253b605a5a6f4068cb5c46b2f9d4d20a224d
font_02_sfnt_off000114f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114F6 9360 bytes
SHA-256: db6fc8f3f9db218600923aa516021d881b791f15b396b53809151d5aff47d7f3
font_03_sfnt_off000132f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132F4 11568 bytes
SHA-256: 2d83a6d75dd6dcc917aa9d8eee851a9f155bf8d2140fe270d2905dab02853e43
font_04_sfnt_off00015a23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15A23 16732 bytes
SHA-256: 8c740aec6987556ecd1310ba9c41bf69d4d4180d1ae36bb50c04b672c107a918
font_05_sfnt_off0001717e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1717E 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34
font_06_sfnt_off00017f32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17F32 1736 bytes
SHA-256: 1648accd5638f26481c437d0e436fdfb03edab78dab75f4e73239278c8cddc19

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