Malicious PDF — malware analysis report

Static analysis result for SHA-256 607148dda8893518…

MALICIOUS

PDF

68.4 KB Created: 2021-02-16 21:07:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: f3d970b80ee1ce5c26d919faf91d81fc SHA-1: 1e2333c6794d2db8959e11efbbbbc79718f1c0cf SHA-256: 607148dda88935188cc87decd6bfb8ca42fb12fdae05b50982a0d45b574109fd
126 Risk Score

Malware Insights

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

The PDF file is detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, with one prominent URL pointing to 'seumenha.ru' and disguised as a Honda HS520 owners manual, suggesting a phishing or malware distribution lure. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this, indicating the PDF is part of a link farm hosted on disposable domains.

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 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://seumenha.ru/123?utm_term=honda+hs520+owners+manual PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4489415/normal_5fe91be6dba32.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369164/normal_5fdecadc90f17.pdfIn PDF document text
    • http://rapisakaxo.66ghz.com/18180601869.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449392/normal_5fed6768048a4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446635/normal_5fdb9ed01f20f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4391624/normal_5ff35b0d6470e.pdfIn PDF document text
    • https://xuwomiber.weebly.com/uploads/1/3/0/9/130969046/7334542.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426269/normal_602a5a9a93be2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450336/normal_5fe4bb662026a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4463263/normal_5ffd0ec09a170.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://dejudunobagozut.epizy.com/australian_casual_employment_contract_template.pdfIn PDF document text
    • https://s3.amazonaws.com/firudegix/az_103_exam_dumps.pdfIn PDF document text
    • https://s3.amazonaws.com/buganabowumujef/thyroiditis_management_guidelines.pdfIn PDF document text
    • https://s3.amazonaws.com/vipinib/buderus_boiler_user_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/resisuna/bajirao_mastani_movie_tamil.pdfIn PDF document text
    • http://tupusivamiguta.rf.gd/jyoti_name_cake_pic.pdfIn PDF document text
    • https://s3.amazonaws.com/jozetej/bizixilutim.pdfIn PDF document text
    • http://giwofigu.epizy.com/purabezume.pdfIn PDF document text
    • https://s3.amazonaws.com/farokof/guidewire_testing_training_in_hyderabad.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ceb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEB2 5516 bytes
SHA-256: 52e96fb9a2186488f5c04ec4d22cc5c56f6f8eabd3c9c96129f4145bd36492c1
font_01_sfnt_off0000e158.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE158 10368 bytes
SHA-256: fe3ee6be9c915a9e9541182fb93bc53fc3107846ec079fca5122ca701175fa02

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