Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b120b8c84897643…

MALICIOUS

PDF

84.7 KB Created: 2021-06-04 19:55:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: a47c6e874b7ec99e30e198ddd817a6ab SHA-1: 255b967a5a422ce78a6c490e7dda458443018c95 SHA-256: 2b120b8c8489764398975b1d238bbd0c413af175fe710296029dbd4ca20fe827
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 0.9998

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://bologen.ru/123?utm_term=amd+driver+for+ubuntu+16.+04 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4452372/normal_6013b2e73bb74.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4499317/normal_5ff1dfbe53530.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469353/normal_605f558fb96b9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421970/normal_5ffed1660c80f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425912/normal_603471a6ce43e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366371/normal_5fcc9499a76df.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486997/normal_60272d37cafa9.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pijipusap.pbworks.com/f/tisazeteduzexed.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f7f50672-ee23-4dc1-9919-f2530dae583f/will_alexa_work_with_my_samsung_smart_tv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4ae0f3b3-e53e-42dc-93cb-e0d64099f77f/stranger_in_a_strange_land_grok_quotes.pdfIn PDF document text
    • http://xuruzinijub.pbworks.com/w/file/fetch/144423816/kizubodoxeb.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4372ae6e-680d-4648-b36c-5d05d56f1db2/around_the_world_in_80_days_1956_movie_streaming_free.pdfIn PDF document text
    • http://xalanupuzewo.pbworks.com/f/simplifying_algebraic_fractions_questions_and_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/51be6bea-3713-466e-8c67-7773a8a480e7/matemticas_cuarto_grado_paco_el_chato_contestado.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/76b2a686-cfcf-4cf4-ba2f-cc5bb8dac08c/remington_model_11_serial_number_lookup.pdfIn PDF document text
    • http://nusuwoxub.pbworks.com/f/tewubaxuwi.pdfIn PDF document text
    • http://zuvevetub.pbworks.com/w/file/fetch/144421668/zitejedo.pdfIn PDF document text
    • http://godekazonigi.pbworks.com/w/file/fetch/144435291/15385220102.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_off00010cb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CB5 5288 bytes
SHA-256: 83f3606d93e63859ff363657b22d3fcfc843ced123fc9471464552b7bd9460f1
font_01_sfnt_off00011eba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EBA 11656 bytes
SHA-256: 086756d3db90960532610296353e28343ebd5dfeb41bb2927feb32770bb3f4b3

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