Malicious PDF — malware analysis report

Static analysis result for SHA-256 c87ad77e7ea6d106…

MALICIOUS

PDF

93.1 KB Created: 2021-04-18 09:00:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 6ef4cd263b3292559e785e986e554ad6 SHA-1: 12b4b8f48e377c07db3a2a41c927ecd50f310091 SHA-256: c87ad77e7ea6d106a4b8ec126dbf6cd537df70defe3bf75c68507e022806cf35
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, suggesting it is part of a link farm designed to drive traffic to potentially malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. No scripts were extracted, but the PDF structure itself is used to host and distribute links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://xezojetit.ru/strik?utm_term=what+is+the+latest+generation+of+kindle+fire+8 PDF link annotation
    • http://topshops.website/minimax_s45_bandsaw_manualoqp3k.pdfIn PDF document text
    • http://myirn.icu/how_much_does_it_cost_to_install_a_natural_gas_tankless_water_heaterv6lr1.pdfIn PDF document text
    • http://wifefavowe.iblogger.org/ascended_master_spirit_guide.pdfIn PDF document text
    • http://sefobadivura.iblogger.org/zoology_optional_notes.pdfIn PDF document text
    • http://lawinafudem.22web.org/nezuridalur.pdfIn PDF document text
    • http://spiritstudio.ru/31941857198r13yb.pdfIn PDF document text
    • http://consequences.space/vatalunewuligamuzirodaxiyuc9r.pdfIn PDF document text
    • http://fuvilejolo.iblogger.org/86128707924.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://ae8c1479-5121-4009-b0ed-8259dbb1205b.filesusr.com/ugd/0aff45_3c9dc470fa8448a7aacff7bd1831ac2a.pdf?index=trueIn PDF document text
    • https://115777a2-cc0e-4789-9e99-30cf4bdfca1a.filesusr.com/ugd/2b3546_98cf2c2b7a3d470fa42679d64ab31a10.pdf?index=trueIn PDF document text
    • https://33b7cf8b-1cb2-46d9-9063-17e97cba5e80.filesusr.com/ugd/9edd50_9613a814864a42b183a58631b4d3f491.pdf?index=trueIn PDF document text
    • https://77da94c0-0f0a-445b-87af-e489a0b5ef66.filesusr.com/ugd/db1da1_163d8c8355f84c46bd0994e3f940cd1b.pdf?index=trueIn PDF document text
    • http://daluxufugul.epizy.com/ziguxagajiwowiloru.pdfIn PDF document text
    • http://valamujunitun.epizy.com/answer_key_hssc_clerk_22_morning_shift.pdfIn PDF document text
    • http://legatuwaw.epizy.com/fesijor.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e4d6546b-3e52-4906-9865-275d0d6daff0/54739108436.pdfIn PDF document text
    • http://jafiporada.epizy.com/adeptus_titanicus_vk.pdfIn PDF document text
    • https://c480cc3d-c044-45b7-a7fa-747782367dcd.filesusr.com/ugd/a26f59_0de9cee18ac941bc99a97298e9958442.pdf?index=trueIn PDF document text
    • https://9579f988-9383-433c-acf3-5fff76e0c882.filesusr.com/ugd/191a6d_066dcea927fd460f8522ab32f9e04231.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/5b95307a-a9c3-41aa-a574-07d0f8623880/57190745795.pdfIn PDF document text
    • https://fb413987-6e77-4bf1-aaa6-e97eb550fbee.filesusr.com/ugd/108936_1149c92cb48443488e6d6ae0c6d22a73.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/4e57b713-4ace-478b-87a7-39ce70df8ff9/tenanupususugapujavefonag.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a0b7d039-bb04-4f27-8585-4cbc13cb9ebd/automobile_mechanical_engineering_salary.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/88f61758-36da-401f-a179-3a856ecf072e/nixon_mini_blaster_user_manual.pdfIn PDF document text
    • http://lodufuvu.epizy.com/calendar_worksheets_for_grade_4.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
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012116.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12116 5228 bytes
SHA-256: 6d2dffe94235ab1b940ce2c866470115069c56bce893c212e1e89e82df5b00bf
font_01_sfnt_off000132d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132D4 10892 bytes
SHA-256: 43aa8cbf1942ca54eafccbc10783b49268995edba1dcec3650814411181a8e36
font_02_sfnt_off00015824.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15824 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c