Malicious PDF — malware analysis report

Static analysis result for SHA-256 99bd786e6af0a522…

MALICIOUS

PDF

85.2 KB Created: 2021-03-20 00:16:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 241f594cee1edbc8f5ed8c7a2b5faa2f SHA-1: a897325c86e07a7db476e648e66c1a64a5009245 SHA-256: 99bd786e6af0a5224250866bf2e85def9390c7e9a4354f4e92efc6db5813e1d0
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of external links, many pointing to disposable domains and potentially malicious content, as indicated by the 'PDF_SEO_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristics. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery through the linked PDFs. The primary IOC is the initial URL which appears to be a redirector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://ponafet.ru/strik?utm_term=american+megatrends+recover+bios+settings PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4377101/normal_6036dc3aea6b1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417123/normal_601a1bd36b065.pdfIn PDF document text
    • http://idealslimitalia-official.site/poker_hands_cheat_sheetyixjl.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4372085/normal_5fcf4921a40f7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379731/normal_600a44d470740.pdfIn PDF document text
    • http://spiritstudio.ru/94628032902pmvvx.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379611/normal_605012962c2ee.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370265/normal_600f32674e97f.pdfIn PDF document text
    • http://auto-agents.space/18388345814ck7gl.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496586/normal_6033deb82acbc.pdfIn PDF document text
    • http://reassurez-moi-fr.info/xirozefinelagejebusrhpiy.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4488810/normal_5fc8456aeed68.pdfIn PDF document text
    • http://lnstagaram-verifiedbadges-from.com/paradise_lost_book_10vklbk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447658/normal_6033792665550.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385863/normal_604f4e0e8fed1.pdfIn PDF document text
    • http://mestikon.online/wegotpnfex.pdfIn PDF document text
    • http://2220202.ru/dell_1905fp_monitor_specificationsfqpj3.pdfIn PDF document text
    • http://24magazine.ru/blank_number_line_worksheetsdnjlm.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://9f53eded-325d-4e02-8430-7c09bd872488.filesusr.com/ugd/e04405_7dd9e4e3b4944fbcabe45bcef5f0a82b.pdf?index=trueIn PDF document text
    • https://63209029-b609-4f89-80e5-af59b408cdb4.filesusr.com/ugd/0713e6_b22c96474b764ee7a9696d05e132ccc8.pdf?index=trueIn 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_off00010e31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E31 5416 bytes
SHA-256: 422c7beae8cc0dfc1c3409b6fd5b4dc92f2e8c424b8f46f6aed68b8d458686b8
font_01_sfnt_off00012087.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12087 11360 bytes
SHA-256: 26e6c2b6695bcc65528e844fff41a4bc1c819be78b727fc98bbc1d7e81d952ee

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