Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c3a9370f499fec9…

MALICIOUS

PDF

77.4 KB Created: 2021-03-17 02:05:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: a2592c20f69f9ae2526d2c08387c956f SHA-1: 6ed1139fc21e2b5767ee2aa3a28a1d34b1c2fab4 SHA-256: 2c3a9370f499fec902c0d859adf256f9f3fe83dbbf8a230c91a4d8e418ebef6c
244 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded links, many pointing to disposable or redirector domains, indicating a link farm designed to distribute malicious content or phish users. Heuristics like 'PDF_MALICIOUS_REDIRECTOR_LINK' and 'PDF_SEO_LINK_FARM' strongly suggest this malicious intent. The ML classifier also flagged the PDF with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://dafemum.ru/award?keyword=cerebrovascular+system+pdf In PDF document text
    • https://cdn.sqhk.co/jakufomego/W0QRspU/project_makeover_mod.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463272/normal_60374727c182c.pdfIn PDF document text
    • http://daating19.site/61930866306sshs8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447646/normal_602c77d84adc5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410002/normal_600aad8bb08e0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490256/normal_60129ae2e8a49.pdfIn PDF document text
    • http://rocketdocs.us/spider_man_3_ppsspp_game_filenl7f1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453329/normal_602543f2d6325.pdfIn PDF document text
    • http://greatholl.com/54832092640abp3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4377125/normal_5fe0263f32cbd.pdfIn PDF document text
    • https://cdn.sqhk.co/bilexodofose/13ofjdr/32107730687.pdfIn PDF document text
    • https://cdn.sqhk.co/lixipadiwel/tiiFC6q/26246370494.pdfIn PDF document text
    • http://moresukko.ru/jojovireburupenosuplb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415326/normal_600f8dd7c9a12.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/b5be849e-1d38-4a32-850d-7f4a9cb76b2c/8434015108.pdfIn PDF document text
    • https://b615eccc-4413-4b1d-8109-ede925130a83.filesusr.com/ugd/0994f9_29e7da1f31b84ab48e6fda256826e2af.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/bf132b62-14e0-4cb9-bfb6-be920273e57f/kufisoxokanogasirijudaf.pdfIn PDF document text
    • https://689a2394-1721-4ce0-b6f7-af9f1dc0d621.filesusr.com/ugd/0f5b72_f9fd740d493640118476b731dd64a69e.pdf?index=trueIn PDF document text
    • https://24218389-b518-4ca3-8548-65eaf758daa4.filesusr.com/ugd/c836c3_88076a12a0b34cd2b8338d222e719fd0.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/21d66e7c-12e1-4c4d-9db5-613373e49862/guvabuw.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_off0000f082.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF082 5508 bytes
SHA-256: 2061d03b1633ef61ff7723de4c3ea2a0195472ef4179ff2f1e56929d116e2b36
font_01_sfnt_off0001032c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1032C 10936 bytes
SHA-256: 808b0f447a2bc28305f5e95a377092453ba1c088ab438a22b3f6d96f6ff9c4ea

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