Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd306648ecf8242c…

MALICIOUS

PDF

77.5 KB Created: 2021-02-12 00:43:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 68329567799d8ebc2c286576b3fe104f SHA-1: 588099c12aa5a650d6145a6a5493d0905de1e3a7 SHA-256: fd306648ecf8242c438b34cfc7d87c75eacd48004b6408892cca90135e0d4882
126 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 ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple disposable domains, with one notable URL being https://jacksth.ru/123?utm_term=mjvm2ll%252Fa+release+date. The presence of embedded URLs and the nature of the link farm suggest an attempt to redirect users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://jacksth.ru/123?utm_term=mjvm2ll%252Fa+release+date PDF link annotation
    • https://bunojero.weebly.com/uploads/1/3/0/8/130874162/lokowotuseken.pdfIn PDF document text
    • https://mibinataxufix.weebly.com/uploads/1/3/1/4/131438539/jofaritula.pdfIn PDF document text
    • https://cdn.sqhk.co/fuzokikili/jjfzgeu/stick_it_soundtrack_youtube_film_completo.pdfIn PDF document text
    • https://cdn.sqhk.co/jasamomedam/iiCicjf/pisisigifebiwavitinekano.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4479462/normal_5ff9031663c1b.pdfIn PDF document text
    • https://cdn.sqhk.co/muditazu/Fyxifji/suxoputuwoz.pdfIn PDF document text
    • http://rirarojafetojep.iblogger.org/79083731400.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369771/normal_6018c219437a4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465688/normal_6023cc9a14d73.pdfIn PDF document text
    • http://digtalcaliper09.xyz/zasekzq051.pdfIn PDF document text
    • https://nobixerevogug.weebly.com/uploads/1/3/4/4/134481004/dapurotunev_waxabemukowajo_gigikosinulomu.pdfIn PDF document text
    • https://lilikegemuvil.weebly.com/uploads/1/3/1/3/131398424/1052357.pdfIn PDF document text
    • https://lepepapiminokuj.weebly.com/uploads/1/3/4/4/134493398/8d6d4674.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387566/normal_6019a25abfd20.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wuwovedivaz.rf.gd/achu_gana_song_mp4.pdfIn PDF document text
    • http://supitemev.rf.gd/duxutenefur.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f330.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF330 5280 bytes
SHA-256: c865fe0109e4446ca918d6f11e398d8e8f19a040abf46e47a99b210d29819424
font_01_sfnt_off00010523.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10523 10704 bytes
SHA-256: ecd101678aef920e434d8facf8ecb928d9de52b5b37304a42b773f604df7d2c6

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