Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b2fd55b86e95b79…

MALICIOUS

PDF

76.2 KB Created: 2021-05-09 20:43:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 67d79f6cfe75ea70376c38eee06635fc SHA-1: 7210e236198caabce8df5f59b6aa0493b719cda7 SHA-256: 4b2fd55b86e95b79949d63b5a622b74d3fc36701532a96bbe0c6b2a448d8c2a6
186 Risk Score

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 0.9997

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://seumenha.ru/strik?utm_term=asus+rt-n53+wireless+router+manual PDF link annotation
    • https://cdn.sqhk.co/neseleko/jbjc0je/learn_spanish_through_music_with_lyrica.pdfIn PDF document text
    • https://cdn.sqhk.co/kewusikata/ahehgtb/learn_more_python_3_the_hard_way_review.pdfIn PDF document text
    • https://cdn.sqhk.co/vabadoma/1U7UNfe/radio_flyer_cyclone_reviews.pdfIn PDF document text
    • https://rofosuvobatijam.weebly.com/uploads/1/3/4/6/134661532/lupelisuseruxif.pdfIn PDF document text
    • https://kenojulovananav.weebly.com/uploads/1/3/4/0/134016885/fugiwuwidasiro.pdfIn PDF document text
    • https://cdn.sqhk.co/mogujawogo/jfgdgic/sajiviwugokiguvopusez.pdfIn PDF document text
    • https://cdn.sqhk.co/tebesafe/f8BTmjb/tegegazozoxapep.pdfIn PDF document text
    • http://pivolirarorip.mypressonline.com/69159987479.pdfIn PDF document text
    • https://cdn.sqhk.co/navuwamas/jcmtIRY/street_fighter_vs_gang_mod_apk.pdfIn PDF document text
    • https://solekavugixe.weebly.com/uploads/1/3/3/9/133999951/dibeluxuwexix-jemuzubifuve-tolifiga.pdfIn PDF document text
    • https://cdn.sqhk.co/febenanedibu/ih1jhdO/porter_cable_cordless_nail_gun_manual.pdfIn PDF document text
    • http://bidusifekinu.66ghz.com/fuvobusiki.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lebozid.epizy.com/zulosogiz.pdfIn PDF document text
    • http://galexuduxegi.epizy.com/62343053123.pdfIn PDF document text
    • http://ziboporo.epizy.com/english_standard_version_esv_bible.pdfIn PDF document text
    • http://xuvotawelotito.epizy.com/adeptus_astartes_kill_team.pdfIn PDF document text
    • http://valaxamagiladir.epizy.com/60677797056.pdfIn PDF document text
    • http://fuvarijes.atwebpages.com/hp_12c_mortgage_calculator_instructions.pdfIn PDF document text
    • http://wepunulirepobi.myartsonline.com/lemawekujosutorusevulaxe.pdfIn PDF document text
    • http://tazomibege.epizy.com/cant_turn_on_dolby_atmos_samsung.pdfIn PDF document text
    • http://vovugawe.rf.gd/whirlpool_front_load_washer_door_wont_unlock.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_off0000ed35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED35 5232 bytes
SHA-256: cb2c6c823046e36bae984c373f73cd6cefd81cb1e2d512bcf07f5ba9b096bc38
font_01_sfnt_off0000ff04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF04 10660 bytes
SHA-256: 3bd1cb4020ec2cac58b6fbaa6c5600348f97c88e6fbda5c2e924589615b261e0

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