Malicious PDF — malware analysis report

Static analysis result for SHA-256 285a3a0e565c4ab9…

MALICIOUS

PDF

81.3 KB Created: 2021-02-24 05:54:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 69644d18416776421407426f1b23fc4d SHA-1: 91752219d652fcdb2df75065cd6e17916367d0ac SHA-256: 285a3a0e565c4ab94efd8c9d876d198472816514b7adee4b5c1330c7fc54a94e
166 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 0.9998

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
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://bologen.ru/123?utm_term=what+is+the+depth+of+knowledge+levels PDF link annotation
    • https://cdn.sqhk.co/wikaraxixi/fgiibJq/grandparents_gift_ideas_for_baby.pdfIn PDF document text
    • https://cdn.sqhk.co/kinanekoxo/heYuigw/53628508191.pdfIn PDF document text
    • http://francobusiness.com/egregious_eleven_diabetesasq8r.pdfIn PDF document text
    • https://cdn.sqhk.co/pozigafo/GhfVpp5/fruit_legend_game_app_download.pdfIn PDF document text
    • http://workshop-fb.ru/5286677589b1k2q.pdfIn PDF document text
    • http://bionatur.space/35822538587c48tp.pdfIn PDF document text
    • http://privateguardingserviceagainstdanger.site/23491702709gxttx.pdfIn PDF document text
    • https://cdn.sqhk.co/duzupafuj/vmPc3jc/91813498517.pdfIn PDF document text
    • http://usacreditreport.info/sorry_for_the_inconvenience_sign_templateljaq7.pdfIn PDF document text
    • https://cdn.sqhk.co/rureroso/9ggjhhd/toon_blast_candy_crush.pdfIn PDF document text
    • http://aarbuz.space/95775618678y13lm.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/tonemakopinibem/stadler_form_charly_floor_test.pdfIn PDF document text
    • https://s3.amazonaws.com/laradusa/zopexijegafetej.pdfIn PDF document text
    • https://s3.amazonaws.com/rujimidujek/comment_afficher_formule_dans_excel.pdfIn PDF document text
    • https://s3.amazonaws.com/damerirazib/holt_geometry_workbook_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/buwosevax/belogar.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_off0001008b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1008B 5436 bytes
SHA-256: 25ef65efc4dcbf82b761c65ee6873899d8b26468ba0199c3aea9dc3d2f5965fd
font_01_sfnt_off0001132e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1132E 10748 bytes
SHA-256: 6d5ed753c2f321b653a23c158f4617afdf6318bf395eacaa5867b8647ef64b3b

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