Malicious PDF — malware analysis report

Static analysis result for SHA-256 249db37c4997d1e9…

MALICIOUS

PDF

90.8 KB Created: 2021-06-12 19:06:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: cd0ac6443e2301ecc4c61199604655f0 SHA-1: b785952aee0e2a3ba06298bd53c76f11a8699e52 SHA-256: 249db37c4997d1e913aba4981f31e7a249b5ac2e72a7aee867f63d868316d618
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://nomylo.ru/pbw?utm_term=tzvetan+todorov+the+fantastic+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4454670/normal_60603416715ae.pdfIn PDF document text
    • https://mopomavimixefor.weebly.com/uploads/1/3/1/1/131164117/wutuv-datunojuvowalix.pdfIn PDF document text
    • https://pipokusu.weebly.com/uploads/1/3/3/9/133997176/73794.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369179/normal_5fd11c8e52fd7.pdfIn PDF document text
    • https://damenuxorofupob.weebly.com/uploads/1/3/4/7/134711178/sazarigudeketa.pdfIn PDF document text
    • https://sipedevesebin.weebly.com/uploads/1/3/4/8/134879103/labozetip.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451230/normal_5fca091a7fa39.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372086/normal_600fddad00953.pdfIn PDF document text
    • https://sasadopebob.weebly.com/uploads/1/3/5/3/135324308/lasegi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4407299/normal_5ff4d03e989ed.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/904f8569-c155-4b0f-a564-ebbc7ec96d80/9595910166.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/98c92317-7576-4fb3-a3c1-01800950cf75/cyberpunk_2077_update_1.07_release_date.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/95c6ae4b-3a2c-46e4-b986-5d58db018c67/motorola_walkie_talkie_t600_h2o.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c0c35f9f-3683-4b58-9dce-7c29f112f574/29771817926.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/515d4da7-e943-4b47-abc5-9f2ebf81cbc4/the_decision_book_review.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/781ef816-0d76-409a-80be-e9208fea2cce/vezezixo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/19027cc4-5b61-4e78-b288-0f54aa0a69d0/to_kill_a_mockingbird_calpurnia_quotes_chapter_12.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c19be76f-ec90-4e2a-b4b0-b5646e4e71df/59233254376.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ceedda69-7699-4a9d-9d48-1a9a624e9daa/novation_launchkey_49_mk1_mk2.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a4c8a22a-1136-4d24-9250-1fd8b539615f/vemosupeferixotikagi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/717d867d-bdf2-4304-9aed-bc9d8ee40d8f/51040335916.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ed330124-59e5-405d-a3fa-eeec584cdb2f/terenikev.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_off00012575.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12575 5272 bytes
SHA-256: 94fec183c67cb3757afe22ce562dc501de55417d64c55370f7f775cdbdfc0d87
font_01_sfnt_off00013770.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13770 11232 bytes
SHA-256: 180c20426c32eb29d849f18a4f5b58497f23f5cb8c0e98faaf1aae8e850d8c0d