Malicious PDF — malware analysis report

Static analysis result for SHA-256 a04f2857c4c087a1…

MALICIOUS

PDF

74.2 KB Created: 2021-04-04 08:16:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: f74bccd3153a33f11080e82071599a32 SHA-1: 71ccdedea99fe7bb7b87bea2c98c909008f1c179 SHA-256: a04f2857c4c087a1eed2311dbd448c73498a3f78c66e2fa5e79a6e3993649962
186 Risk Score

Malware Insights

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

The sample is identified as a phishing lure impersonating Facebook, directing users to a malicious PDF via a redirector. The PDF itself contains multiple external URIs, suggesting it's part of a link farm designed to host phishing content. While no scripts were explicitly extracted, the PDF structure and heuristic firings strongly indicate a credential phishing attack.

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
  • 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://notaxivarem.weebly.com/uploads/1/3/4/6/134633458/d0073614a.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://gimoguvi.ru/strik?utm_term=how+to+find+your+ged+records PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4470401/normal_5fe126bb749eb.pdfIn PDF document text
    • https://notaxivarem.weebly.com/uploads/1/3/4/6/134633458/d0073614a.pdfIn PDF document text
    • https://cdn.sqhk.co/tupipitijil/LpijUhd/27701399443.pdfIn PDF document text
    • http://siteznakomstv69.space/54606673152c2s4d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421360/normal_603c35aeb2670.pdfIn PDF document text
    • http://shishkin-seed.xyz/ice_fishing_lures_for_lake_troutv4a7b.pdfIn PDF document text
    • https://cdn.sqhk.co/zevijevam/jiLibpT/daxerigolitena.pdfIn PDF document text
    • https://buduruzuled.weebly.com/uploads/1/3/2/6/132682090/306011a1.pdfIn PDF document text
    • https://cdn.sqhk.co/sulugedako/dhdieOe/rizinitajoxasev.pdfIn PDF document text
    • https://cdn.sqhk.co/lebexuzo/cgjhdja/super_cobra_replacement.pdfIn PDF document text
    • http://spindlndou.space/do_keto_pure_diet_pills_really_work43yxa.pdfIn PDF document text
    • http://prizinsta365.website/how_do_you_fix_the_incline_on_a_proform_treadmillqrd5e.pdfIn PDF document text
    • https://vukojudal.weebly.com/uploads/1/3/5/3/135317211/d5f7f1f4f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4504922/normal_605477f34ec63.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450354/normal_5fd85dcb2ebd4.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lajoleturib.rf.gd/gesudaremaj.pdfIn PDF document text
    • https://s3.amazonaws.com/satuja/engineering_drawing_plane_scale_questions_and_answers.pdfIn PDF document text
    • http://xafepabofi.epizy.com/rorusebevivepufajanufidas.pdfIn PDF document text
    • http://pirarotuweze.rf.gd/xulikomaki.pdfIn PDF document text
    • https://s3.amazonaws.com/liguwubore/kesafavenevonegi.pdfIn PDF document text
    • http://xasobanezifo.rf.gd/dryer_sheets_in_australia.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_off0000e391.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE391 5104 bytes
SHA-256: 10f9dc8b912fcdda278f53fd4f2e9feeeec438705c68f5a0cbd772d0f5fdef14
font_01_sfnt_off0000f51a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF51A 11348 bytes
SHA-256: 11a1004da13df8748666ba24f4ca8482fb7737534dbb419caa59093b9b06692a

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