Malicious PDF — malware analysis report

Static analysis result for SHA-256 4cf1daf741271e85…

MALICIOUS

PDF

80.4 KB Created: 2021-03-01 12:53:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 4bb6810d24b9f2845aa7607c40229074 SHA-1: 9074a06ae490245a92e65ffc033110d077354105 SHA-256: 4cf1daf741271e852bab8ceeffb4e330a35e5050b650305a8c9eb228af70d92c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, with several pointing to disposable hosting and potentially malicious domains, suggesting a phishing or malware distribution campaign. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically flags the document as a link farm on disposable hosting, reinforcing the malicious intent.

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://ponafet.ru/123?utm_term=how+long+is+a+red+cross+first+aid+certificate+valid+for PDF link annotation
    • http://santaparker.store/557107921412kzom.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4488855/normal_5ffd9d5057c12.pdfIn PDF document text
    • http://biotringel.shop/john_deere_delphi_radio_wiring_diagramaxv8u.pdfIn PDF document text
    • https://cdn.sqhk.co/livukigelo/hdW9ibI/9639298022.pdfIn PDF document text
    • http://xafopawiki.medianewsonline.com/jisitomeduvitumor.pdfIn PDF document text
    • https://cdn.sqhk.co/bikegola/gdijig6/flow_online_top_up_bvi.pdfIn PDF document text
    • http://shop-kid-toys.online/the_new_gate_schnee_and_shinfmkbv.pdfIn PDF document text
    • http://trikolor.site/clinical_pathology_made_ridiculously_simple_free_download39u6s.pdfIn PDF document text
    • http://yblda.fun/101185120994msq7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4492897/normal_5fe4327447ad7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443598/normal_60295b047e5e3.pdfIn PDF document text
    • http://nafarami.medianewsonline.com/what_would_be_an_examples_of_psychoanalytic_theory.pdfIn PDF document text
    • https://cdn.sqhk.co/puvegipuros/hasifBZ/17733238013.pdfIn PDF document text
    • http://mybiol.site/pomemoruvumuxapa77qgy.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4373004/normal_5ff3a27797aa8.pdfIn PDF document text
    • http://microdigitalmeter.xyz/aambala_tamil_song_masstamilan2q3ex.pdfIn PDF document text
    • https://cdn.sqhk.co/jeforije/gi9HihN/bepelizow.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393644/normal_5fc9e1c015b2b.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://doriponesarom.myartsonline.com/topivukukalepifap.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_off0000fab6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAB6 5304 bytes
SHA-256: 9dddc6e731cc1a8491f7559a6628a44a2bad82b53201afdb39d44ce84fe74e73
font_01_sfnt_off00010cec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CEC 11460 bytes
SHA-256: a8f6ddf7df76d855ef38f2bb8be1ea95d081b87a0870df10f301cd0e5faf8205

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