Malicious PDF — malware analysis report

Static analysis result for SHA-256 c701ce2958278f2c…

MALICIOUS

PDF

90.4 KB Created: 2021-06-09 06:57:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: e3180ebbad7ef5d81dda87015a9b01b7 SHA-1: afe25212baa9df8d8784c1d4dbac7a6e757b15ef SHA-256: c701ce2958278f2c1bbfe1dc0b6ad6a5e6703f34d20bc8198e4be28e55e8508b
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

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 0.9997

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://crysiq.ru/pbw?utm_term=you+caroline+kepnes+read+online+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4450721/normal_6038101b4d76a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367013/normal_5fe955e89ef76.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4385214/normal_60076e53ef87c.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4408976/normal_60b2399788287.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lekuzax.pbworks.com/f/gired.pdfIn PDF document text
    • http://xugilip.pbworks.com/w/file/fetch/144507744/all_types_of_transistor.pdfIn PDF document text
    • http://fisukafetif.pbworks.com/w/file/fetch/144895932/64819747270.pdfIn PDF document text
    • http://sulegiwi.pbworks.com/w/file/fetch/144914964/dulilotudofa.pdfIn PDF document text
    • http://nonesupul.pbworks.com/w/file/fetch/144628851/relolusovokebawota.pdfIn PDF document text
    • http://najapenoz.pbworks.com/f/dutem.pdfIn PDF document text
    • http://betosaxugawi.pbworks.com/f/vasorupasox.pdfIn PDF document text
    • http://genarozep.pbworks.com/w/file/fetch/144490161/37608314865.pdfIn PDF document text
    • http://misabovu.pbworks.com/f/bivorafetoj.pdfIn PDF document text
    • http://xuresasadox.pbworks.com/f/58601250702.pdfIn PDF document text
    • http://giribuv.pbworks.com/f/significado_de_soar_con_uniforme_de_enfermera.pdfIn PDF document text
    • http://supatibu.pbworks.com/f/apache_max_log_file_size.pdfIn PDF document text
    • http://mefijunov.pbworks.com/f/beethoven_spring_sonata_violin_sheet_music.pdfIn PDF document text
    • http://kufavuva.pbworks.com/f/53046088302.pdfIn PDF document text
    • http://sepaxebi.pbworks.com/w/file/fetch/144413766/galudovujevibujonefi.pdfIn PDF document text
    • http://wisarazed.pbworks.com/w/file/fetch/144729129/44402672565.pdfIn PDF document text
    • http://gogoporiwo.pbworks.com/f/tokinidagusadifubunuxa.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_off00012369.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12369 5172 bytes
SHA-256: 42fbf321226723c9d3d6af68b08994421adeb635246783cda22ba300a5e85840
font_01_sfnt_off00013510.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13510 11452 bytes
SHA-256: f13dc67c64ca41e223ce16c745c2ac0df96e8962378e29f8b81652d66739e4ef

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