Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa3fdd32014130a3…

MALICIOUS

PDF

76.8 KB Created: 2021-06-02 17:40:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d187829c20484e0d145717f4d4e6e571 SHA-1: d4629b65b4741776d1ac3a464ef2085ba8c69b2c SHA-256: fa3fdd32014130a38f4da1f8d461f39b8e55983254d0e5b89f2d9fb2bb95d111
96 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, suggesting a link farm or SEO spamming attempt. The ML classifier strongly indicated maliciousness, and the PDF structure itself is suspicious due to the mass of external links. While no scripts were directly extracted, the presence of embedded URLs and the overall structure points towards a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 4

  • 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://vilenefex.ru/123?utm_term=active+learning+template+examples
    • https://cdn-cms.f-static.net/uploads/4450336/normal_6042c30e43122.pdf
    • https://lonopenofof.weebly.com/uploads/1/3/4/8/134895818/687c2b57.pdf
    • https://cdn-cms.f-static.net/uploads/4378621/normal_5fd7d585136e7.pdf
    • https://gononazenikemad.weebly.com/uploads/1/3/4/4/134482012/jepabeba.pdf
    • https://mufunada.weebly.com/uploads/1/3/4/6/134623537/volodibizupu.pdf
    • https://vozumovoso.weebly.com/uploads/1/3/4/5/134506012/779664.pdf
    • https://menekagamop.weebly.com/uploads/1/3/4/0/134097565/texifukiroriret.pdf
    • https://votilolezin.weebly.com/uploads/1/3/4/3/134307270/3244697.pdf
    • https://bafuvaki.weebly.com/uploads/1/3/4/3/134336870/5839963.pdf
    • https://cdn-cms.f-static.net/uploads/4368500/normal_6036db316c41d.pdf
    • https://jejabulalirolu.weebly.com/uploads/1/3/4/4/134464322/navunagukom_padexikesose.pdf
    • https://cdn-cms.f-static.net/uploads/4455403/normal_605ee58d730d7.pdf
    • https://cdn-cms.f-static.net/uploads/4450724/normal_602ba7c5be812.pdf
    • https://wifojulov.weebly.com/uploads/1/3/1/4/131438113/borogo_rabikobudoledon_zafekixoxofex.pdf
    • https://siteketu.weebly.com/uploads/1/3/4/3/134362374/toreze-sekexis-fixod-rumezetozuxi.pdf
    • https://gufiferufa.weebly.com/uploads/1/3/2/3/132302963/xigisikikiwi.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/52fe7899-c378-451b-be16-3c413fbdb5ee/29348013861.pdf
    • https://uploads.strikinglycdn.com/files/efec0d01-eaab-4304-a8e4-50dd7d2a4ebf/el_ahogado_mas_hermoso_del_mundo_resumen_quizlet.pdf
    • http://sijomirurefi.pbworks.com/f/dikojibixidiziv.pdf
    • https://uploads.strikinglycdn.com/files/b8cab469-eb30-43e8-ba15-e18eb3b7fe12/99507214554.pdf
    • http://pazimonofe.pbworks.com/w/file/fetch/144461094/nisuteroramodawuwu.pdf
    • http://ruwomodanom.pbworks.com/w/file/fetch/144450759/diabetes_self_management_education_near_me.pdf
    • https://uploads.strikinglycdn.com/files/2fb8519b-2efe-4fa7-bad4-48afc72e6173/codehs_answers_activity_1.10.5_answer_key.pdf
    • https://uploads.strikinglycdn.com/files/d176f374-e3f8-487d-914f-10397c53ac93/the_maze_runner_book_set_big_w.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eedf.bin
d0bb05ac527073127c57ad6982b08e6e88d628f618a29263bc954009f0dbecc2
pdf-font-stream PDF embedded font (sfnt) at offset 0xEEDF 5372 bytes
font_01_sfnt_off00010117.bin
b001e33ccfa6c2556e62bf3222a93026e083cc7b668fa178930633c8b3f3d16b
pdf-font-stream PDF embedded font (sfnt) at offset 0x10117 10756 bytes