Malicious PDF — malware analysis report

Static analysis result for SHA-256 75bfb2cd0357cb17…

MALICIOUS

PDF

85.5 KB Created: 2021-03-31 13:00:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4bcecf7edbef202b8ac5f4add00bc738 SHA-1: 54884bcc32aadfc2531e8381f1a266f91a0babb8 SHA-256: 75bfb2cd0357cb1749ecff0eec8bd92818a34c3c7e2a52e6c5671b7f9a1641ca
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to disposable domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a malicious lure.

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://dugedepap.ru/strik?utm_term=beertender+krups+b90+kosten
    • http://hallop.xyz/amphitheatre_pompeii_informationoyh17.pdf
    • http://foxiduwanati.mygamesonline.org/43993799231.pdf
    • http://nekuwagibajese.getenjoyment.net/jeanne_marie_leprince_de_beaumont_beauty_and_the_beast.pdf
    • http://podipotekoi.ru/jojamokolujapqliu.pdf
    • http://pejokepi.mywebcommunity.org/67905047916.pdf
    • http://paxezot.getenjoyment.net/jijutonaligud.pdf
    • https://cdn-cms.f-static.net/uploads/4413865/normal_60566b9db37a2.pdf
    • http://lamakexo.scienceontheweb.net/bass_guitar_chords_notes.pdf
    • https://cdn-cms.f-static.net/uploads/4405197/normal_600a9994d19c5.pdf
    • http://vedivux.mygamesonline.org/45597560142.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://99d0733d-4d0e-4d19-b238-fea6f81017ca.filesusr.com/ugd/e32e4a_c209442e0c124e7eb6da7fe8a4dbcaf3.pdf?index=true
    • https://30c0d994-bee2-4d79-bc91-d4aaa7251653.filesusr.com/ugd/0962d9_5b45b1367c4a437696147e9d7097f977.pdf?index=true
    • https://48e4e0df-78ce-4736-8797-27735e68dc67.filesusr.com/ugd/f3b179_5403049144fd40d0b0ef4cf90926dff5.pdf?index=true
    • http://lifarodanudu.rf.gd/sopotiwefiwafegazumuluv.pdf
    • http://bememikat.onlinewebshop.net/17331169633.pdf
    • http://xajumin.epizy.com/82338489818.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010261.bin
cd1debf98b6520c47f648f6a1c0210269f5ca120467082f7a22a31872773c8e9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10261 5096 bytes
font_01_sfnt_off000113b7.bin
4626c178d2ac81fdbe4e0734faa803f32f22d5d9d4d52f9df684ce6d6b90bc88		 pdf-font-stream PDF embedded font (sfnt) at offset 0x113B7 12088 bytes
font_02_sfnt_off00013b23.bin
9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13B23 4324 bytes

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