Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a0862e072cba133…

MALICIOUS

PDF

61.7 KB Created: 2021-01-29 04:41:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: f14c05b32ed706da8bcca95e291ba487 SHA-1: b91cf6b09c9da4bce30b207380126ddf7181edb5 SHA-256: 8a0862e072cba133488958af1b1e482a802b3ad94d757cc5eb75e95140c3f15a
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to disposable domains and exhibiting link farm characteristics, suggesting a phishing or malware distribution scheme. The PDF structure and embedded URIs are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://seumenha.ru/123?utm_term=hibdon+tires+okc+hours PDF link annotation
    • https://cdn.sqhk.co/kusamika/ygcrjiw/sdf_3d_models.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4425514/normal_60051a3099d48.pdfIn PDF document text
    • http://hytri.com/strawberry_mango_bubble_tea_caloriesvv2xs.pdfIn PDF document text
    • http://tehnotop.site/diesel_mechanic_near_me_mobilebq6fy.pdfIn PDF document text
    • https://cdn.sqhk.co/nijusukelok/gfiibtr/sniper_elite_zombie_army_4_steam.pdfIn PDF document text
    • http://byseles.xyz/outline_of_matthew_s_gospel_worksheet_answersbvdbw.pdfIn PDF document text
    • https://cdn.sqhk.co/letijefa/gdjfjei/basketball_champions_league_americas.pdfIn PDF document text
    • http://d-youtube.com/city_car_drift_racer_game_downloadguok6.pdfIn PDF document text
    • https://cdn.sqhk.co/betewulo/hagiXLF/voxevoliri.pdfIn PDF document text
    • https://cdn.sqhk.co/badaxiloru/igiihc7/tizufawenano.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4468837/normal_600117ca97f12.pdfIn PDF document text
    • http://dress-russia.ru/rubber_mixing_processo0t4m.pdfIn PDF document text
    • http://copyright-helps-team.com/nudixibezibanae986j.pdfIn PDF document text
    • http://luferuvijudadof.22web.org/jagag.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/tokatefozude/arabian_horse_facts_information.pdfIn PDF document text
    • https://s3.amazonaws.com/vuliwisuwig/brooklyn_nine_nine_season_3_full.pdfIn PDF document text
    • https://s3.amazonaws.com/fuwenoxuzasila/72303602482.pdfIn PDF document text
    • https://s3.amazonaws.com/kufazete/certificado_medico_escolar_formato_sep.pdfIn PDF document text
    • https://s3.amazonaws.com/fadedosi/bajuravevujixewiv.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_off0000b83b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB83B 4948 bytes
SHA-256: 5d352ba2980a3a0b71bf0ca6b4f8a56b2ca8018bb659d9d0e4b9005535ecf223
font_01_sfnt_off0000c905.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC905 9516 bytes
SHA-256: 47760bb448873fac9795603209a75e02179ced61502ad7f8387f4efc56743e19

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