Malicious PDF — malware analysis report

Static analysis result for SHA-256 b38a33b399e9a74c…

MALICIOUS

PDF

82.4 KB Created: 2021-03-04 16:55:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 1bb474c9d7e3feca7da0e049f05e52f2 SHA-1: e7c84d145c0b4868c40356c6f087d4f12a0840bc SHA-256: b38a33b399e9a74c004ebffc63a9affacad1c3fbf00d77118e888e3131e380b9
126 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs, many pointing to disposable domains and configured with UTM parameters, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to a compromised site for further exploitation or credential harvesting. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with phishing campaigns.

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=what+does+the+word+monstrous+mean+in+a+sentence PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4381976/normal_5fdbdc85a1226.pdfIn PDF document text
    • https://cdn.sqhk.co/zetikitor/0QCViJE/43060548024.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465133/normal_6037bb294155e.pdfIn PDF document text
    • https://cdn.sqhk.co/fusozuwalas/egeHgf9/xizajaxedagevan.pdfIn PDF document text
    • http://hh666o.site/oregairu_light_novelc2q3i.pdfIn PDF document text
    • http://hookup154.space/85230681112sde8u.pdfIn PDF document text
    • http://rte-ita.fun/wawemuwobas20sxp.pdfIn PDF document text
    • https://cdn.sqhk.co/kefexunas/uMieAji/zugipoliveriki.pdfIn PDF document text
    • http://swiss-gear.store/the_real_book_bass_clef9qb4h.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4493545/normal_5fdf6610c9cd4.pdfIn PDF document text
    • https://cdn.sqhk.co/goworonol/qierie8/5926116359.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4365549/normal_60092461609ab.pdfIn PDF document text
    • http://ingmijn.com/wijevitiribinufajumo78ii8.pdfIn PDF document text
    • http://kraftmann.su/61116406764eoyho.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/dipafuxe/rotosorumiz.pdfIn PDF document text
    • https://s3.amazonaws.com/ratixifo/jasper_studio_subreport_not_showing.pdfIn PDF document text
    • https://s3.amazonaws.com/zusevamasor/are_legal_expenses_fixed_or_variable.pdfIn PDF document text
    • https://s3.amazonaws.com/podawakumepewez/27375255588.pdfIn PDF document text
    • https://s3.amazonaws.com/jiwisigetizoxif/binder_paper.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f7a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7A3 5132 bytes
SHA-256: 249515f8eb4c6aa777a8444f9389e7f771850a8bd76064133df15528b2a4e772
font_01_sfnt_off00010900.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10900 10928 bytes
SHA-256: 835087d37173c138062da377b179b7f2b8f5505a4059995559caa1c3742d585c
font_02_sfnt_off00012e2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E2D 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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