Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf65ad196fde15f8…

MALICIOUS

PDF

76.3 KB Created: 2021-03-18 02:23:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 4bfc46120e1a9a89544a0bab302715f2 SHA-1: 50fc2d6b24720433d5ea46465bfb57e633393a65 SHA-256: bf65ad196fde15f82dae754706ccb5e4b3c6e9a098947c4778859c2f6ee385af
186 Risk Score
Tags
free-cdn-ebook-manual-lure

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 0.9998

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://botokaw.ru/award?keyword=bryce+canyon+national+park+trail+map+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4466662/normal_602e15056a272.pdfIn PDF document text
    • https://bowonalixatan.weebly.com/uploads/1/3/5/3/135347428/2884642.pdfIn PDF document text
    • https://gokisixoxi.weebly.com/uploads/1/3/4/1/134108612/4343614.pdfIn PDF document text
    • https://juwopivevonu.weebly.com/uploads/1/3/4/6/134682880/xizitunagurinik.pdfIn PDF document text
    • https://ximewenidurap.weebly.com/uploads/1/3/4/6/134651426/8681535.pdfIn PDF document text
    • https://naroxelilokatud.weebly.com/uploads/1/3/1/3/131384214/juvajijododemu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417530/normal_5ff59b295de41.pdfIn PDF document text
    • https://wekigenajelu.weebly.com/uploads/1/3/3/9/133999196/lexifi.pdfIn PDF document text
    • https://nirodafudo.weebly.com/uploads/1/3/4/6/134697392/kejexupelanepi_vodafitetu_jabajeboxevudiv_dekitefi.pdfIn PDF document text
    • https://sesubovokur.weebly.com/uploads/1/3/4/3/134311777/2619747.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376357/normal_6030f839c2af7.pdfIn PDF document text
    • https://peniwifagupe.weebly.com/uploads/1/3/0/7/130738894/93346c38499e.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/481c2c1e-0403-426a-ba31-e9039a834061/oops_tricky_interview_questions_and_answers_for_experienced_in_c.pdfIn PDF document text
    • http://najepesirezamuz.rf.gd/thank_you_letter_for_answering_my_questions.pdfIn PDF document text
    • http://pimewitonuro.epizy.com/72324926025.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/69295fe5-dcfc-4eb0-aaa7-df4603437607/28998160310.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3a7dc803-2ae1-41bb-ac81-947b2cab65d6/literary_terms_book.pdfIn PDF document text
    • http://wawazoja.rf.gd/the_female_brain_book_louann_brizendine.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ecbe6893-233d-446d-8420-6afbe9bd685b/star_trek_enterprise_episodes_ranked.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_off0000eb7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB7A 5340 bytes
SHA-256: 363288f138b0487083d147dd9a5784c6b235a8078b996565122c2025833237a7
font_01_sfnt_off0000fda0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDA0 11264 bytes
SHA-256: 133900e7094cbc14535df6e6cb210a42e7b6fed0e084e8ce882058fa279d73ce

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