Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6e22791febc6700…

MALICIOUS

PDF

74.3 KB Created: 2021-04-01 16:05:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 297a79890e80b720c2e1b08164793df4 SHA-1: 90aa1a1d094387b394692bead2164a6b9628c609 SHA-256: a6e22791febc670072bc29ab05537058fcad74c45e32a89916a4a04259e51737
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 0.9999

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://mezovuduw.ru/wix?keyword=answer+4+reebok PDF link annotation
    • https://cdn.sqhk.co/xegunorasu/LgjijoO/nhl_games_pc_download.pdfIn PDF document text
    • https://cdn.sqhk.co/zafupusapun/jlJhgLj/short_video_app_free_download.pdfIn PDF document text
    • https://cdn.sqhk.co/kubepugemaki/Tiajjhj/jemumena.pdfIn PDF document text
    • https://cdn.sqhk.co/nopusixinid/52jgigy/azo_dye_formed.pdfIn PDF document text
    • http://bijepitujutix.sportsontheweb.net/quimica_inorganica_peter_atkins_gratis.pdfIn PDF document text
    • https://pupuwovojetisig.weebly.com/uploads/1/3/1/4/131438468/5327928.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378175/normal_603b3ab9b0865.pdfIn PDF document text
    • https://cdn.sqhk.co/zamokaxu/8qhcnsn/bleach_immortal_soul_f2p_guide.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426270/normal_600c6f4812854.pdfIn PDF document text
    • https://cdn.sqhk.co/sadirorig/Lhjjfgj/insaniquarium_deluxe_feed_fishes_fight_aliens.pdfIn PDF document text
    • https://mepagalupotope.weebly.com/uploads/1/3/4/2/134265457/1735074.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4458849/normal_5fc5f6e276723.pdfIn PDF document text
    • https://cdn.sqhk.co/navuwamas/Ubjhhix/lewatumunujawizok.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tipipigi.atwebpages.com/kifanezutuwutimapunito.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d6f14a9d-527b-4ae5-9f1d-5edb173550f4/where_is_the_hp_repair_center.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6e4e379a-211d-4222-964a-2420433b7b59/serta_motion_essentials_iii_adjustable_bed_base.pdfIn PDF document text
    • http://soranodabiwegi.myartsonline.com/mewolugudaxojexonukizifo.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

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_off0000e3bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3BD 4812 bytes
SHA-256: e8e320be502d8e42fc5a5f4569d395b141fda224a92911f4777771ed5cebcaf9
font_01_sfnt_off0000f448.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF448 11532 bytes
SHA-256: 1c1b832d34373590338c4eff48da9fdaad91846741632ae3b523928c1cab50ee

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