Malicious PDF — malware analysis report

Static analysis result for SHA-256 2434c8cc587f6076…

MALICIOUS

PDF

78.9 KB Created: 2021-02-06 20:54:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-23
MD5: b0089649c851d30f2fecfe0e97e3634e SHA-1: 9e5d7381eaaf22ff93c61a2eeadcb6850dd3c72b SHA-256: 2434c8cc587f60765c61cbbcd196e9a1eb8eec536ee37cc80fd3fcf229342e5d
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with a high heuristic score indicating it functions as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://bologen.ru/123?utm_term=teacup+pekingese+breeders PDF link annotation
    • https://cdn.sqhk.co/mepapogivoma/IEhdhgk/12789698011.pdfIn PDF document text
    • https://diwopasod.weebly.com/uploads/1/3/4/4/134475510/mokixinam_tebuxugunukofu.pdfIn PDF document text
    • http://natiral.space/fusionner_plusieurs_documents_en_15nv2b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4453729/normal_5fecf7a44dfd4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366050/normal_60128fab1ee50.pdfIn PDF document text
    • http://azakalaza5.xyz/peugeot_206_ecu_wiring_diagramj06ir.pdfIn PDF document text
    • http://topstop.site/246986158240fhex.pdfIn PDF document text
    • https://vuzowukuz.weebly.com/uploads/1/3/0/8/130814197/9316147.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375696/normal_6016e548a70fa.pdfIn PDF document text
    • https://cdn.sqhk.co/vajirasavuz/Hjjjazx/jofob.pdfIn PDF document text
    • http://salearea.pro/mixadodrt98.pdfIn PDF document text
    • https://cdn.sqhk.co/bowewulaxam/ftieZhf/33589738628.pdfIn PDF document text
    • https://fanarise.weebly.com/uploads/1/3/4/3/134377412/cdfae3c.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/pululusodogi/uc_browser_fast_apk_for_pc.pdfIn PDF document text
    • https://s3.amazonaws.com/poguvelefa/nitogixakijosipabagi.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_off0000f522.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF522 5360 bytes
SHA-256: 6210ec605a1b5b8a4110e2c9c1dbdd10d5d3a832b26929feb781815a34f909ef
font_01_sfnt_off00010765.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10765 11052 bytes
SHA-256: e4d0be6243d537b742d477e37500f87a1d3026dc6947c181155d6268fd5c9ef7

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