Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f55175e85ca59e3…

MALICIOUS

PDF

74.6 KB Created: 2021-01-25 21:38:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 0fa772a626144d12ae221677824f097c SHA-1: d14f5f7e5b64f450c6b26da372e3f4513445b8d4 SHA-256: 6f55175e85ca59e333a3a51ac9dded4b38f7f61fac832aa2315519ee6638756b
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was flagged by multiple heuristics as a link farm, containing numerous external URLs pointing to potentially malicious content. The ML classifier and ClamAV also identified it as malicious. While no scripts were explicitly extracted, the structure suggests it's designed to lure users through a large number of links, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://jacksth.ru/aws?utm_term=berhampur+university+admit+card+2018 PDF link annotation
    • http://betflixguvenilirmi.com/black_panther_castmnmai.pdfIn PDF document text
    • http://trudogoliya.online/93637320960vf6tt.pdfIn PDF document text
    • https://tolajugim.weebly.com/uploads/1/3/4/6/134647220/guzelopap.pdfIn PDF document text
    • https://cdn.sqhk.co/wemorapi/diijhap/punubovanonujodifox.pdfIn PDF document text
    • https://cdn.sqhk.co/sawowudin/hQsjije/chickamauga_battlefield_visitor_center_fort_oglethorpe_ga.pdfIn PDF document text
    • https://mitewowepo.weebly.com/uploads/1/3/0/8/130813710/gawewepufa.pdfIn PDF document text
    • https://cdn.sqhk.co/mugapowejog/YRDniHB/super_cat_tales_2_walkthrough_kittens.pdfIn PDF document text
    • https://cdn.sqhk.co/vekuperik/fidifii/nexawa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403936/normal_60040731c72b3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421940/normal_5ffbbfafcea28.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465403/normal_5fe8e60231065.pdfIn PDF document text
    • https://vurerabekude.weebly.com/uploads/1/3/4/4/134493837/digixuzowej-susigosajuz-liwoxebiwo-nowakodademosid.pdfIn PDF document text
    • https://cdn.sqhk.co/depifozopupe/aEVhhgf/farm_frenzy_inc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479240/normal_5fe9a3436882d.pdfIn PDF document text
    • https://cdn.sqhk.co/fuvepelela/iwLibif/vufotusepogakof.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://biwodonugawodil.rf.gd/jijaxixozewudeguvuge.pdfIn PDF document text
    • http://xujogefup.rf.gd/pazinetavo.pdfIn PDF document text
    • http://wukefomirufiza.rf.gd/chamberlain_garage_door_opener_manual_myq.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_off0000df8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF8F 6012 bytes
SHA-256: ea3f619ff95121d59ec89485ab16aea909b3b1eaa13083529ac519a9a1965d13
font_01_sfnt_off0000f3e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3E8 12788 bytes
SHA-256: 75bf0f1f6a85d6c2b54542144a52b6e06e651b633644acae99e7cb0d2dd4d753

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