Malicious PDF — malware analysis report

Static analysis result for SHA-256 3255eda64ece63fb…

MALICIOUS

PDF

68.9 KB Created: 2021-02-09 04:46:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: c285b2a79d2e6868f38408c1b6dd194c SHA-1: f644716bc9c89d00adb156720f09c3730b0f4f9d SHA-256: 3255eda64ece63fbe06e39cdc1f3294e9dfbbfe1b2bd397aa50609f8ed624a72
186 Risk Score

Malware Insights

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

The PDF document was flagged by multiple heuristics, including ML classification and ClamAV, as malicious phishing content. It impersonates WhatsApp and uses a link to an abused redirector, `https://zexojoru.weebly.com/uploads/1/3/1/4/131409474/vumopesuvativo.pdf`, to lure users into providing credentials. The document body is heavily obfuscated, but the presence of external URIs and link farm heuristics indicate a malicious intent to redirect users to potentially harmful sites.

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
  • 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://zexojoru.weebly.com/uploads/1/3/1/4/131409474/vumopesuvativo.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://jacksth.ru/123?utm_term=properties+of+rectangles+worksheet+answers PDF link annotation
    • http://wei-nmvc.com/kebixog2efy.pdfIn PDF document text
    • http://spencermcman.us/zazogojeqzxec.pdfIn PDF document text
    • https://cdn.sqhk.co/wepigosogo/hgDjbU3/gesef.pdfIn PDF document text
    • http://devicesprotectionforusers.site/metaphysical_anatomy_evette_rosezb7hp.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368767/normal_5ff3d4cd20b2d.pdfIn PDF document text
    • https://zexojoru.weebly.com/uploads/1/3/1/4/131409474/vumopesuvativo.pdfIn PDF document text
    • https://cdn.sqhk.co/fopujetoros/ieVEjgd/xogigenexejedijajejufaj.pdfIn PDF document text
    • https://cdn.sqhk.co/tumosirewuw/jihiejd/41572359359.pdfIn PDF document text
    • https://godebisexizo.weebly.com/uploads/1/3/0/7/130775633/ponofulemux.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393190/normal_6018e606b369c.pdfIn PDF document text
    • https://cdn.sqhk.co/keropolor/gg99JWq/rumowo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4480155/normal_5fceabf64ab95.pdfIn PDF document text
    • https://cdn.sqhk.co/lazujanaziri/a5jb8id/military_commando_shooter_3d.pdfIn PDF document text
    • http://migerov.xyz/84386881078rnnvb.pdfIn PDF document text
    • https://nofodomeki.weebly.com/uploads/1/3/1/8/131871852/3019107.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/mozedijiz/unchained_melody_violin_sheet_music_free.pdfIn PDF document text
    • http://budivisatenebo.rf.gd/blaupunkt_40_inch_led_tv_manual.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_off0000d0d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0D2 5432 bytes
SHA-256: f2151d463a350da8582ef849f5e107f899de1a6b62a86142dcf2018db5447d40
font_01_sfnt_off0000e35d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE35D 10260 bytes
SHA-256: 5a9cc878029ee818f4acec280e01149fc9ce56c747660c12c31b250aa603dde9

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