Malicious PDF — malware analysis report

Static analysis result for SHA-256 2315868f58a30d4a…

MALICIOUS

PDF

79.4 KB Created: 2021-04-02 06:12:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 25c4fe1ab94a493bc5763f2516439922 SHA-1: 51ca0f29bb047012c3bd290c40419119cd15f6c1 SHA-256: 2315868f58a30d4a6a29f981a5ecb0fe57f2442609997b598164e5e4fb530685
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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://mezovuduw.ru/award?keyword=multivariate+statistical+methods+a+primer+pdf PDF link annotation
    • http://fawikenaxalu.scienceontheweb.net/candidiasis_pathogenesis.pdfIn PDF document text
    • http://libutulidux.medianewsonline.com/59839031219.pdfIn PDF document text
    • https://cdn.sqhk.co/piwixesiwufo/ggjehaC/block_puzzle_fantasy_paypal.pdfIn PDF document text
    • https://cdn.sqhk.co/pegiridireva/hbK9ii6/better_camera_for_laptop.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4448545/normal_6007c4f755963.pdfIn PDF document text
    • https://cdn.sqhk.co/mivadunoxo/dggHidl/30783588900.pdfIn PDF document text
    • https://cdn.sqhk.co/xibetevoxaj/2diaVoZ/mx_player_como_usar.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476590/normal_604737f0cfc1a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/jijumupade/cowboys_vs_aliens_movie_in_tamil.pdfIn PDF document text
    • https://f405dec1-7f90-4f4c-a861-5286f67d0127.filesusr.com/ugd/ab922d_d4ca26a2221342e88b63a82080275b63.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/f2e0ffa8-e85e-4c50-a6f9-112d3cc4cf89/hp_officejet_pro_8610_printhead_cleaner.pdfIn PDF document text
    • http://zugagib.atwebpages.com/ptu_syllabus_b_tech_cse.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8fc95fb2-5c3d-4921-947a-9f8855f36e3e/74147062507.pdfIn PDF document text
    • https://s3.amazonaws.com/bojafazes/neluvofigazu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/18a37328-575c-410d-8256-b9d2ec3a542b/26999781386.pdfIn PDF document text
    • https://eb9d0a7c-f241-4274-9260-18def620c3fd.filesusr.com/ugd/796b85_3f9c46da82ef408b996740c5362eee57.pdf?index=trueIn PDF document text
    • https://92fed17e-af34-466b-b3fe-38cd9ef27699.filesusr.com/ugd/192d58_2eb5221a4fb048f3aa890a5ed4e3bb3e.pdf?index=trueIn PDF document text
    • https://a21f0d7d-5fe0-4a99-a381-3b18266e0880.filesusr.com/ugd/6c313a_60d3d263474a44e3b18e2b7b49e887ab.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f86d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF86D 5460 bytes
SHA-256: 26cf1ab64cea275366527798c9d99646e97e0740bacf1a4386c152f5f39a6c07
font_01_sfnt_off00010ae9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AE9 11080 bytes
SHA-256: 4eb58f3c8572148d2161e5a62cb7f63b84243a3905736f5e225e4028806b7202

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