Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef3d831abd45ac35…

MALICIOUS

PDF

81.6 KB Created: 2021-04-06 12:20:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 7ba14f92b86b176a2de87ae048e01e93 SHA-1: 79c3c08910e78db9947f4551158b2744233e45c3 SHA-256: ef3d831abd45ac35921adcb634e827becfc6a9c7c77e30020f146e19644903e7
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains numerous external URIs, with a primary one pointing to 'fokemale.ru'. Heuristics indicate it's a link farm on disposable hosting, and ClamAV detected it as 'Pdf.Phishing.Trojan'. The ML classifier also flagged it with high confidence. While no scripts were explicitly extracted, the PDF structure and embedded URLs strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://fokemale.ru/aws?utm_term=singer+7462+user+manual PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4445570/normal_5ffd9c4a403f2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422879/normal_602b2ce89ebcf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485012/normal_606bc38a29d6e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4453334/normal_600947af4e919.pdfIn PDF document text
    • http://zibepifutidi.sportsontheweb.net/67596562974.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458161/normal_6009ffe6af99b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4480895/normal_5fe1cd0f87ae8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378604/normal_600a9d93709f3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4365542/normal_5fcbaddfc1561.pdfIn PDF document text
    • http://bukupiduge.mypressonline.com/vugedi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414500/normal_606b9d3241d0b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454824/normal_601c6a3a77bf7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413566/normal_5ffa2fc80ce53.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://dexizijisub.atwebpages.com/femoveregere.pdfIn PDF document text
    • http://gogewafusa.rf.gd/karujamivubekad.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fd672297-c5e9-41c9-975b-7b62b1c3c6e4/yard_machines_riding_mower_42.pdfIn PDF document text
    • http://monufaro.epizy.com/5133010067.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/760ae13b-3c29-4fbf-9d35-936d5e011643/what_type_of_plate_boundary_does_indonesia_have.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e03be71e-cc98-4ce5-a5ce-ffaafef27102/doninufedorazalen.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b2a507e9-b3c2-4f7c-bee0-4fb668367e72/toyota_camry_trd_price_reddit.pdfIn PDF document text
    • http://valogaberel.rf.gd/zogiwakawuko.pdfIn PDF document text
    • http://mifetominugumow.epizy.com/reflexive_verbs_spanish_games.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_off000100a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100A9 5564 bytes
SHA-256: e86899c9f0515362f65fa2e9b6a7c347f09c31ec78788dd7728d4d552e16a469
font_01_sfnt_off00011392.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11392 11124 bytes
SHA-256: 6df903534de2bd83bc53c1f6a982cf8bc3b9db20c3dcda3b52fb333e8a5586ab

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