Malicious PDF — malware analysis report

Static analysis result for SHA-256 8157cc940652ce20…

MALICIOUS

PDF

71.8 KB Created: 2021-03-14 10:33:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 55f83c870305c8547ea4e91884a97194 SHA-1: 6f2058be49bc8f3c2f49099ef082b985a73f3702 SHA-256: 8157cc940652ce20b11d2198fedefcbaeb9b959bf104730a3df433f36a7023cc
186 Risk Score

Malware Insights

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

This PDF file exhibits characteristics of a link farm, containing numerous external links disguised as a catalog. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded URLs point to suspicious domains, suggesting a coordinated effort to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://midufefew.ru/award?keyword=catalog+avon+c14+2020+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4417408/normal_5fe18e5e6c791.pdfIn PDF document text
    • https://cdn.sqhk.co/sugigevapure/cpxijqm/29370868256.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427538/normal_602f99af345ca.pdfIn PDF document text
    • https://linuvovozesuv.weebly.com/uploads/1/3/4/7/134774252/4755693.pdfIn PDF document text
    • https://sonatovixafu.weebly.com/uploads/1/3/1/8/131871956/8605212.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377407/normal_6028aac3aabf8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474176/normal_600d02e475306.pdfIn PDF document text
    • https://gideturifit.weebly.com/uploads/1/3/4/8/134887905/zagipafawoboleb.pdfIn PDF document text
    • https://cdn.sqhk.co/losomilodip/hbjjib9/bulleit_bourbon_rye_total_wine.pdfIn PDF document text
    • https://cdn.sqhk.co/jadilogivusa/uWgeidw/60122745335.pdfIn PDF document text
    • https://worojipe.weebly.com/uploads/1/3/1/3/131382243/mobefenob-bavesoweboxo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465949/normal_601f154784214.pdfIn PDF document text
    • https://jikuvubavul.weebly.com/uploads/1/3/5/9/135964228/6c2269a2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4392853/normal_6004062d8c1c6.pdfIn PDF document text
    • https://cdn.sqhk.co/guledijuxi/RO4hjhg/helicopter_for_sale_cheap.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464700/normal_601bb41d47dec.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465386/normal_603a3e3884fc9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4372963/normal_5fca9292275a5.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://liwujurepawoweb.rf.gd/96777446762.pdfIn PDF document text
    • https://s3.amazonaws.com/gagagakigibapo/zafisalemigujafuzukawir.pdfIn PDF document text
    • https://s3.amazonaws.com/nupotukig/tafogewide.pdfIn PDF document text
    • http://puwojewemuxa.epizy.com/pomasotilaloxomixezof.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_off0000d63f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD63F 5428 bytes
SHA-256: d3e0bdcf65f07823ffba14a865ccde9cad973514accc45a79d135f51f89b98ea
font_01_sfnt_off0000e8e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8E2 12560 bytes
SHA-256: 3817d4ecb7659bd1da2856a671d4bc007c940e355f6645ea81d30a5b91ca343e

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