Malicious PDF — malware analysis report

Static analysis result for SHA-256 7902ed7d2cf02c53…

MALICIOUS

PDF

91.2 KB Created: 2021-02-19 23:40:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 0c6729b9bf6b519c5bace989e0d97b05 SHA-1: 6cbc6d854d69623cfbaf7942a202de63f34afbd1 SHA-256: 7902ed7d2cf02c539203e9e95ccf8aaad97c0c602bb6ae18fbbaaee6c9a1ac4e
184 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with one specifically identified as a malicious redirector. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, a tool often used to create malicious PDFs that mimic legitimate documents.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than 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.
  • 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://yafferge.ru/strik?utm_term=resumen+libro+jardin+secreto In PDF document text
    • http://axacheat4.xyz/vijifukowuduselewawofetknqr.pdfIn PDF document text
    • http://tehnotop.site/zugokomejugawezu4p029.pdfIn PDF document text
    • https://cdn.sqhk.co/mikevoponage/iW8zwhi/71286325722.pdfIn PDF document text
    • http://doweryklkq.space/dell_venue_8_pro_charger_best_buyqc8sl.pdfIn PDF document text
    • https://cdn.sqhk.co/sixajuzap/6hgfhjR/new_dude_perfect_overtime_17.pdfIn PDF document text
    • https://cdn.sqhk.co/xexisini/gClljve/mubevawod.pdfIn PDF document text
    • http://geosen.net/free_templates_for_blogger_2018ok299.pdfIn PDF document text
    • https://cdn.sqhk.co/butituguxur/7Ehgd7B/hatsune_miku_live_wallpaper_apkpure.pdfIn PDF document text
    • http://stikc.xyz/medical_fitness_certificate_samplexw9an.pdfIn PDF document text
    • http://fitit.space/45343105368c5002.pdfIn PDF document text
    • https://cdn.sqhk.co/jusupovexewa/TEygcgi/pefupa.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/towutoginadivu/canon_ip2700_printer_user_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/pokixovuxik/all_feeling_ringtones.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_off0001275e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1275E 5308 bytes
SHA-256: 8747fd1858c1b90aa888dbd7d2a6b01217ab122c33cb2ebfe528c801bdec1684
font_01_sfnt_off00013955.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13955 11684 bytes
SHA-256: eafb354bbc5f560cef0098ff0f5d9538f1ee4c58bb612299b8fc72611385ee3a

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