Malicious PDF — malware analysis report

Static analysis result for SHA-256 f50773e351dab1c9…

MALICIOUS

PDF

76.7 KB Created: 2021-03-18 03:28:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: f196819b96f48c987f6f0d8520613902 SHA-1: b07a8055d5b559e15c446d75d160ccd3300fd125 SHA-256: f50773e351dab1c991192012b327200c34a0f190c5a8a27c0295bac4ba1c8ef5
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link T1059.007 JavaScript

This PDF file was flagged by multiple heuristics as malicious, including a critical finding for brand-impersonation credential phishing. The document contains numerous external URIs, many of which point to disposable hosting or redirectors, suggesting a phishing campaign. The ML classifier and ClamAV detection further support the malicious verdict.

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
  • Brand-impersonation credential phishing lure critical SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: action link to abused redirector https://juleverut.weebly.com/uploads/1/3/4/4/134488806/4698512.pdf.
  • 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://midufefew.ru/award?keyword=aadhar+card+name+change+form+pdf PDF link annotation
    • http://manamuposa.getenjoyment.net/87223333848.pdfIn PDF document text
    • https://cdn.sqhk.co/zeliravepuj/ghjeDif/lizisiwelisikumigazolesed.pdfIn PDF document text
    • https://juleverut.weebly.com/uploads/1/3/4/4/134488806/4698512.pdfIn PDF document text
    • https://poxawakepuk.weebly.com/uploads/1/3/1/6/131606289/zenikijidakotum-rakuza.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4500877/normal_60527ffc97300.pdfIn PDF document text
    • https://fedaxowazujiwiz.weebly.com/uploads/1/3/4/0/134012387/gagemob_poloxijijibexis_vawekefamipit_pogamizamow.pdfIn PDF document text
    • http://wobafobigo.mywebcommunity.org/medicinal_plants_download.pdfIn PDF document text
    • https://xevefoworux.weebly.com/uploads/1/3/1/3/131380592/2927104.pdfIn PDF document text
    • https://cdn.sqhk.co/bikegola/oGhdhim/shogun_restaurant_menu_la_verne_ca.pdfIn PDF document text
    • https://cdn.sqhk.co/jenotonolo/djdiggh/mobfish_hunter_mod_apk_download.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471475/normal_6045860e10866.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/joterige/free_30th_birthday_invitation_templates_printable.pdfIn PDF document text
    • https://s3.amazonaws.com/numegubowalonan/wusunobovezamob.pdfIn PDF document text
    • http://medexode.atwebpages.com/59378972884.pdfIn PDF document text
    • https://s3.amazonaws.com/muxegeza/xukitugadesajewexibegete.pdfIn PDF document text
    • http://jetotajasavesi.atwebpages.com/gawubijajebutopidikogafet.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_off0000ef4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF4B 5348 bytes
SHA-256: c7a2c4ceebb30af22966ff5120b48f3989638fcb2cf396eaf16df4764f8c5a18
font_01_sfnt_off00010159.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10159 10780 bytes
SHA-256: ddcb8c51334cd20670ff1be0d6551208cc08c2c4d576af5c8a00bcdd9c96faaf

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