Malicious PDF — malware analysis report

Static analysis result for SHA-256 16002f4f91af9b32…

MALICIOUS

PDF

103.5 KB Created: 2021-02-22 23:00:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 6e341ef8e3f1fcc18187d52e0de0587f SHA-1: 237921c98cade470257f2dc672223fbc4e0928da SHA-256: 16002f4f91af9b324262b7e159e8f9de8203fc601d9734bf85585ed2076bd2b0
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO manipulation tactic. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution via these links. While no scripts were directly extracted, the PDF structure and numerous external URIs point towards an attempt to redirect users to potentially harmful content.

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://seumenha.ru/123?utm_term=phonetic+alphabet+chart+aviation PDF link annotation
    • https://cdn.sqhk.co/junigofulum/6jj20AS/the_labrant_fam_easter_2020.pdfIn PDF document text
    • https://nevozijefase.weebly.com/uploads/1/3/4/7/134748823/1608191.pdfIn PDF document text
    • https://cdn.sqhk.co/kabevapixox/jfPFBib/513623731.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412999/normal_5fdb03ce3e628.pdfIn PDF document text
    • http://hookup671.site/easy_recipes_for_a_smoothieq3cne.pdfIn PDF document text
    • https://cdn.sqhk.co/mofokamibe/c7KDrXs/tawifaki.pdfIn PDF document text
    • http://pubgucbayim.com/prentice_hall_gold_algebra_1_answers_form_gltedn.pdfIn PDF document text
    • http://meetplafond.xyz/52917801918w8m2u.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4414166/normal_6004948c61dcd.pdfIn PDF document text
    • https://gunapozebufe.weebly.com/uploads/1/3/4/3/134316646/bowigutipunabi.pdfIn PDF document text
    • https://malojedatev.weebly.com/uploads/1/3/0/8/130813840/dejugonusitoseru.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4478398/normal_5ffba810e7a58.pdfIn PDF document text
    • https://cdn.sqhk.co/kowaziwaso/9JePJid/dibal_reduction_of_amides.pdfIn PDF document text
    • https://cdn.sqhk.co/zanivuwiduvo/fibhfge/diary_mood_tracker_bullet_journal_by_tranquilos.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kawojimulogizef.rf.gd/bebaka.pdfIn PDF document text
    • http://bewidiri.rf.gd/glow_in_the_dark_party_invitations_templates.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_off00015031.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15031 5044 bytes
SHA-256: 3701a7dd75b8c146129b37e1dc621cff1ab7366b6a2a74700593f13d0a23ff27
font_01_sfnt_off00016159.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16159 16168 bytes
SHA-256: 12ba873ae3b4912a6b393fe21afd15456e6ed2d0806f45de1e2a092482467a53

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