Malicious PDF — malware analysis report

Static analysis result for SHA-256 042b50b51be74618…

MALICIOUS

PDF

75.8 KB Created: 2021-02-11 23:57:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: ca7f14517cb3697194110e7c06ea64ad SHA-1: 82f91be519e2f2fa5a83aa3fd2401e0c9a64d9bb SHA-256: 042b50b51be7461828c7cf11880ed567872a97880eddbe11a3c413ea35d5d6d1
126 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous external URIs and is described as a link farm on disposable hosting, suggesting a phishing or SEO spam campaign. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristics point towards an attempt to redirect users to potentially harmful content.

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 http://vuvuga.xyz/14759818252css62.pdf In PDF document text
    • https://cdn.sqhk.co/mikevoponage/ZSigbgf/xabevaxotajefolidifufo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4375908/normal_5fc85b191e182.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469641/normal_60189f970217a.pdfIn PDF document text
    • https://cdn.sqhk.co/pimidima/gihhejj/disadosajikusewatazijaxir.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368471/normal_60090623a9d34.pdfIn PDF document text
    • https://cdn.sqhk.co/genopeno/ggjhgjz/52527567067.pdfIn PDF document text
    • http://latuha.com/purebdcraft_bedrock_downloadl3d6x.pdfIn PDF document text
    • http://kersita.space/puwividuzojifojigufufawp9t1k.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4444115/normal_5ffde3ae2765c.pdfIn PDF document text
    • https://cdn.sqhk.co/xeduwukaxusa/O2hbfmB/free_music_video_maker_apps.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443344/normal_600a54a0b9a30.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369487/normal_5fcbfab24d2d5.pdfIn PDF document text
    • https://cdn.sqhk.co/ganuniwiku/japjdgc/6_pack_beer_plastic_rings.pdfIn PDF document text
    • https://seumenha.ru/wb?keyword=app.%20usePDF link annotation
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zedafazoteto.epizy.com/repavizavanasezasexut.pdfIn PDF document text
    • http://noboxiroxe.epizy.com/congestive_heart_failure_treatment_guidelines_canada.pdfIn PDF document text
    • http://fatewazut.epizy.com/jadulowagobavedasigofap.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_off0000e918.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE918 5416 bytes
SHA-256: af1f24b591539c3fd39f1e1a16a9481c93fff47ec5f5635f94ba800816612cc8
font_01_sfnt_off0000fb8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB8A 11240 bytes
SHA-256: 6e3bd012c54ca72a26e3e2c0fc632de9b059460c14c393c65fad9e1537311a83

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