Malicious PDF — malware analysis report

Static analysis result for SHA-256 fcd8ac56719863ef…

MALICIOUS

PDF

80.5 KB Created: 2021-05-29 06:51:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 1293ab667585b19c360d26af4b8809cd SHA-1: 55475143412863198865a07fedf7a53945fd5a43 SHA-256: fcd8ac56719863efefb27087e054e30b9dfaee988f16622a3682994d7a820787
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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://soxebez.ru/123?utm_term=ac+market+apk PDF link annotation
    • https://lulakoxefinadi.weebly.com/uploads/1/3/4/3/134332070/5484487.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451228/normal_6058a943de953.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4466154/normal_6008cc5294c25.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412890/normal_60435dff3bf6d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4452400/normal_5ff0eae19586d.pdfIn PDF document text
    • https://gelurojaf.weebly.com/uploads/1/3/4/6/134697462/dijesobezom.pdfIn PDF document text
    • https://sojetupeduxagi.weebly.com/uploads/1/3/1/8/131856567/3269956.pdfIn PDF document text
    • https://xavebebojemap.weebly.com/uploads/1/3/4/8/134848852/bufibor_zabeva_lukagikekaboxub.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387408/normal_606b08a9966f8.pdfIn PDF document text
    • https://manoduxasef.weebly.com/uploads/1/3/4/0/134041035/d23288c7884cf00.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489247/normal_6026d86b7135d.pdfIn PDF document text
    • https://gexuganogos.weebly.com/uploads/1/3/0/8/130813630/sevelepodo.pdfIn PDF document text
    • https://daxekofaji.weebly.com/uploads/1/3/1/6/131606395/fenejawaz.pdfIn PDF document text
    • https://rakurewirusemew.weebly.com/uploads/1/3/4/0/134017151/667138.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470029/normal_5fddbc83b3936.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/29f077af-2b6a-41d0-9a4c-045f42cfb574/how_to_turn_on_ingenuity_swing.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/80471a4e-e5b9-43b8-8399-f24325d98ccc/2008_dodge_avenger_sxt_v6_specs.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/01c3b393-79d5-4145-ade5-d01190b00672/67605545269.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_off0000f3cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3CD 4924 bytes
SHA-256: b3cdad05525cda90b84c99928cecf1cdfdc9bd9870141f5a12a770b98594ce26
font_01_sfnt_off00010479.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10479 21652 bytes
SHA-256: 850da41038e969b31aa261b19a8f5a45606c7b69170c851a2289a4f8c0bbb286

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