Malicious PDF — malware analysis report

Static analysis result for SHA-256 e30384912fefbff8…

MALICIOUS

PDF

76.5 KB Created: 2021-02-27 07:17:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5999f5a004d4be45232b590e0d48014d SHA-1: c21c07d0be153ae60da1807c18db57f1c9924a8f SHA-256: e30384912fefbff8dd0febaafd389d4be446a0829bfa82f5cac49ee964479aa5
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous embedded URLs pointing to disposable hosting and link farms, suggesting an attempt to redirect users to malicious content. The document body, though heavily obfuscated, contains metadata related to 'wkhtmltopdf' and a search term for '2003 jeep liberty limited edition reviews', which is likely a lure to disguise the malicious intent.

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=2003+jeep+liberty+limited+edition+reviews
    • https://static.s123-cdn-static.com/uploads/4471240/normal_5fde924850c52.pdf
    • https://jowanubeso.weebly.com/uploads/1/3/5/3/135399775/sinejemi_paborapoxo_debaniwam_zemulupefox.pdf
    • http://free-at.pro/34811391291ea7tx.pdf
    • https://zobojosapez.weebly.com/uploads/1/3/1/4/131483592/viguwijomojurirap.pdf
    • http://expressday.online/cognitive_behavioral_therapy_worksheetsq8ov5.pdf
    • https://cdn-cms.f-static.net/uploads/4425255/normal_602e129b38c9d.pdf
    • http://indohealth365.online/gutej05eqt.pdf
    • https://pusurezifokuni.weebly.com/uploads/1/3/4/3/134317864/7027649.pdf
    • https://cdn-cms.f-static.net/uploads/4486550/normal_6028108c48c34.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://tufopabapud.rf.gd/50631960230.pdf
    • https://s3.amazonaws.com/wekibik/53218927347.pdf
    • https://s3.amazonaws.com/mibiwivanetuj/bluejackets_manual.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ee25.bin
a1cdf6dd7a09d13bcca0f62a7e187be6a01c2ae3da579332502bc19a092c421c
pdf-font-stream PDF embedded font (sfnt) at offset 0xEE25 5708 bytes
font_01_sfnt_off00010190.bin
08544a453c8e2fd0b4fe6b02ae61be79f89dcfc65fa1650d8f3003ae10daae83
pdf-font-stream PDF embedded font (sfnt) at offset 0x10190 10476 bytes