Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8377a6ef31d0efd…

MALICIOUS

PDF

73.3 KB Created: 2021-03-30 09:14:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1d104f12e043c72150c9f7808b534f35 SHA-1: dcbad1b2c6fba34b2c444cd6aa17dadc788f6164 SHA-256: a8377a6ef31d0efd9eda39433b59e229a1e3d411ef95d1253b584ec0545bf08e
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which are dynamically generated and point to potentially malicious domains, indicating a link farm or SEO poisoning tactic. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous external links suggest it's designed to redirect users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://dugedepap.ru/award?keyword=adenoma+hipofisario+en+ni%25C3%25B1os+pdf
    • https://wigizidipi.weebly.com/uploads/1/3/5/9/135984633/87dc285.pdf
    • http://kleomaften.online/topinumikinum5yi.pdf
    • http://goodsun.fun/8447181157495j57.pdf
    • http://gazzsheff.xyz/ruvoxoxosegulasumen9scaw.pdf
    • http://salejozokaboruz.22web.org/conceptual_physics_chapter_35_test_answers.pdf
    • https://luzidasagozoro.weebly.com/uploads/1/3/4/3/134319964/396800.pdf
    • https://pafutidosuzov.weebly.com/uploads/1/3/5/9/135989867/5e0f0ca6b14d2b.pdf
    • http://cetapp.xyz/lista_tascn_2004_descargarzz76r.pdf
    • https://sodujamewo.weebly.com/uploads/1/3/4/7/134750465/bamekozo_gebexikalofonar.pdf
    • http://arenaprobet.com/zabipitiminulojijek6k7sv.pdf
    • http://ig-objectionform.com/74808733922l0zf.pdf
    • http://idealslim-italiaofficial.site/669576617852rhyx.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/bomifabipi/70248347103.pdf
    • https://s3.amazonaws.com/nefomojuwet/nunoge.pdf
    • https://s3.amazonaws.com/pevarijidasalop/free_quadratic_equation_worksheets_with_answers.pdf
    • http://riporem.epizy.com/kudobinuv.pdf
    • https://s3.amazonaws.com/vatakefojunib/20049214811.pdf
    • https://5a4e7950-e122-4b3c-9cf7-894e7f5b1216.filesusr.com/ugd/76aeb6_ebb95c78a15b4e688093c7f66120c635.pdf?index=true
    • https://081e7fb2-604d-424b-9b75-a58d54a71a44.filesusr.com/ugd/abd6ea_152e4359f6c243b68dc5601b90e9b465.pdf?index=true
    • https://13a7c488-548c-4b48-b567-d2b0b9a3e1de.filesusr.com/ugd/85d67f_078fe5f432ba49398ffbd4df272b906b.pdf?index=true
    • 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_off0000deb9.bin
b0b1b2121d2ed27959fd581dd4402cc5e20ee290bc5d36874707e557403200ba		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDEB9 5448 bytes
font_01_sfnt_off0000f0d4.bin
0a0695787c067302d98c3dfe254312f6430e09d67d3efb9a1ddeb79ca632f682		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF0D4 11332 bytes

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