Malicious PDF — malware analysis report

Static analysis result for SHA-256 297944c0e094526d…

MALICIOUS

PDF

80.4 KB Created: 2021-02-27 05:01:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 1d9f96742a7b6c2d5d005106abccc640 SHA-1: d2751e0f8ff73ffb61969e5c070fef954bd378d9 SHA-256: 297944c0e094526daa71f8c9305dd64fb329f8a73b13b4613e9ed137c2f3ac2c
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable hosting, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a phishing or malicious redirection scheme.

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
  • 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://zajinet.ru/123?utm_term=el+hijo+horacio+quiroga+personajes+principales PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4387816/normal_600dd64347d91.pdfIn PDF document text
    • https://cdn.sqhk.co/gojikanemiju/lhcB0HI/50708270996.pdfIn PDF document text
    • https://cdn.sqhk.co/petebeki/aXvgebp/xapipipogisozijiz.pdfIn PDF document text
    • https://jarufepijup.weebly.com/uploads/1/3/0/7/130776730/gevepabezot-parufiselepilu-xekekumaru.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4456372/normal_6001d067829f1.pdfIn PDF document text
    • http://guxabena.22web.org/computer_architecture_a_quantitative_approach_6th_edition.pdfIn PDF document text
    • http://dutuvowori.22web.org/who_does_cochlear_implants.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424007/normal_6020f9b4b1741.pdfIn PDF document text
    • https://cdn.sqhk.co/bukoxomule/iciWDGy/sewuxarulamowaxapazewe.pdfIn PDF document text
    • https://cdn.sqhk.co/modajili/OMX6wii/zombie_defense_shooting_fps_mod_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/mepowokugo/jcXgjpl/anti_aircraft_gun_ww2_facts.pdfIn PDF document text
    • https://noxawopaxuroge.weebly.com/uploads/1/3/1/3/131398379/betenam_xazomi_todolulidemo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375702/normal_5fd28d60aa94a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lituvatitibew.epizy.com/second_conditional_practice_worksheets.pdfIn PDF document text
    • http://zugoxovok.epizy.com/neniriporizuvadefege.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_off0000fa80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA80 5356 bytes
SHA-256: 94701c0620b6b758f52ed9d1ab3d171f6ce957c5376ef0990ce462d0b94342f1
font_01_sfnt_off00010cb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CB1 11628 bytes
SHA-256: 64d12ed5c1eada95beb649f19ed7dbb38f81abd43e32e7d09be95b5aad97f345

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