Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c06ed91b26ef1f8…

MALICIOUS

PDF

91.8 KB Created: 2021-03-03 04:28:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 86c9d69f67ef7f11f9be54afcb893478 SHA-1: 2518116c9c0854328e3f915c0c747dea2778223a SHA-256: 4c06ed91b26ef1f8cb338a2c132bc5033e300d409d569fd10244574042e8a90c
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of external links, identified as a link farm. The ClamAV detection and ML classifier strongly indicate maliciousness, likely related to phishing or malware distribution. The embedded links suggest an attempt to direct users to potentially harmful content or exploit kits.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://jumiwimov.ru/123?utm_term=examples+of+social+cognitive+learning+theory+in+the+classroom PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4393925/normal_600d7ffdd78d4.pdfIn PDF document text
    • http://chisto-chisto52.ru/48853096526jtgtx.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420449/normal_6019dab71ec82.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446380/normal_602b6b0868ee2.pdfIn PDF document text
    • http://copyright-rules-help.com/kazamevalemufipuvabela9myp0.pdfIn PDF document text
    • https://cdn.sqhk.co/pirujezexod/ie4Vge3/toolbox_organization_hacks.pdfIn PDF document text
    • https://pupowoxixibigi.weebly.com/uploads/1/3/1/4/131438439/e389e9ebaf4339b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4468572/normal_5fd7792dea936.pdfIn PDF document text
    • https://cdn.sqhk.co/mitebosareki/jihiifs/huey_mobile_phones.pdfIn PDF document text
    • https://cdn.sqhk.co/bujasugawo/dqhhgiB/love_letter_card_game_strategy.pdfIn PDF document text
    • https://ritojajugub.weebly.com/uploads/1/3/5/9/135984917/8712b2555d.pdfIn PDF document text
    • http://kinorio5.xyz/biblia_reina_valera_en_linea_con_concordancia1esdd.pdfIn PDF document text
    • https://cdn.sqhk.co/ninoporaleva/halgco6/62942201984.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4471479/normal_5ffdea4b90352.pdfIn PDF document text
    • http://smartcreditus.info/baixar_driver_hp_deskjet_f2430qo5da.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off00012906.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12906 5616 bytes
SHA-256: ca2bac7101850d696e45de48ac75bce7bb299616d33baca9cfdebb1a28eef423
font_01_sfnt_off00013c0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C0C 11176 bytes
SHA-256: 8c35f265432b503c77e8148ee43ce7d937102c7215246d9722b92744c9a7799b

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