Malicious PDF — malware analysis report

Static analysis result for SHA-256 d94a9ee62600e191…

MALICIOUS

PDF

75.9 KB Created: 2021-03-08 18:47:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 51c362df6a0b93c1381cfc71e7e4990b SHA-1: 53f6d6f29737ae691c2357e90221e7bce8562a66 SHA-256: d94a9ee62600e1910667b539c38171341cca6aa35c407b2c5b23ef520992ae80
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are SEO-optimized, suggesting a link farm or a phishing lure. The primary suspicious URL, 'https://maypoin.ru/award?keyword=asvab+arithmetic+reasoning+practice+pdf', is presented as a practice test, a common social engineering tactic. While no scripts were explicitly extracted, the PDF structure and heuristic firings indicate malicious intent, likely to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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://maypoin.ru/award?keyword=asvab+arithmetic+reasoning+practice+pdf PDF link annotation
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/jotizifime/motivation_letter_for_university_application_sample.pdfIn PDF document text
    • https://s3.amazonaws.com/mixanaz/baladoor_movie_hd.pdfIn PDF document text
    • https://ddf64d59-5240-4154-9987-17dfc28e22c7.filesusr.com/ugd/cec570_b5cb1304a4f04327b2a5fb961d54098c.pdf?index=trueIn PDF document text
    • http://poketiwuk.rf.gd/fill_in_the_missing_numbers_to_100.pdfIn PDF document text
    • https://c301b42c-deab-4116-afcd-a09dd0728425.filesusr.com/ugd/4bb894_c847f0465a274d65b857cce3adb35ed6.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/d10258b7-804f-4ffd-90c8-2972b6e48d7c/university_of_cambridge_mphil_history_and_philosophy_of_science.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2a4995a4-975c-45c7-9353-1079f1642cc3/can_i_lose_weight_by_eating_every_other_day.pdfIn PDF document text
    • https://s3.amazonaws.com/nufidibodudulad/62804142127.pdfIn PDF document text
    • http://kafojifonetawaj.rf.gd/online_dbt_therapy_for_bpd.pdfIn PDF document text
    • https://s3.amazonaws.com/mubemutolewe/will_sennheiser_g4_work_with_g3.pdfIn PDF document text
    • https://5d9de69b-f80b-44d6-9c2d-9027806fef0b.filesusr.com/ugd/e26ad2_27c3e5da6a5f4cc4939e6ae2c312a211.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/b43628fe-7964-481f-96bc-8a2de4647024/fupapewof.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/31d005a0-5763-43ca-aa4e-018849c1bbfe/newutafujezemadotutivesij.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f28dae97-6a46-4a40-b638-92d6c52204e0/how_to_make_a_hydraulic_tube_bender.pdfIn PDF document text
    • https://cf268418-7549-4780-9cff-e39e61b5276c.filesusr.com/ugd/0b1cf2_8990c589b3ce4e7280647090a9b3e628.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/62d55e49-6499-4626-8fa7-a5609d1d4665/vubesipovuruxixolo.pdfIn PDF document text
    • http://kazaxese.epizy.com/candy_crush_for_pc_free.pdfIn PDF document text
    • https://s3.amazonaws.com/fixararololu/71610861646.pdfIn PDF document text
    • https://128fc002-9ed4-4a8f-9a6b-83b43563a9ed.filesusr.com/ugd/6812d7_d3544bb2081e49cea4a1085482038b5c.pdf?index=trueIn PDF document text
    • https://34886cf3-15ed-44db-93e8-8979dc7c4cd7.filesusr.com/ugd/ea2c45_0bbb32b158f8447a8f4f4399464e91bd.pdf?index=trueIn 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
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e9ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9FF 5728 bytes
SHA-256: 9cfa8f42eac69ecd89beadc327dfea3e1d8a51b98e8b490f0183fb07d6b997e4
font_01_sfnt_off0000fd53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD53 10644 bytes
SHA-256: 66747f0042ece8aa16d750f53ac15d5e073a8d32e9c4f42ce5676508c79e47ba

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