Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb8e9acc4a531b22…

MALICIOUS

PDF

73.0 KB Created: 2021-04-02 14:11:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 0c67fcd0661625a011d677c0dc8354ef SHA-1: 297dbd5a321b7c53fa47904606fa7b778508ce24 SHA-256: bb8e9acc4a531b2255844c20227795958efcd9cdbc253844e9ae8c034ac1d7c6
134 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains multiple external URIs, including one that appears to be a redirector for a link farm hosted on disposable domains, suggesting a phishing or malware distribution scheme. The presence of a 'download' lure further supports this, aiming to trick users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=the+killing+joke+movie+download+in+tamil PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4420036/normal_5febf2b1d056b.pdfIn PDF document text
    • http://webdefilmizle.com/ss_guide_rail_bracketuosnn.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4411491/normal_5fefc8efcad3a.pdfIn PDF document text
    • http://about-central.com/75313527200lulb7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454968/normal_605557e2d4e24.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4490961/normal_5ff452842fbe1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489844/normal_5fc80ff51c78c.pdfIn PDF document text
    • http://bitcoinlearningcentre.online/free_basic_english_grammar_rules_with_examplesjb3lb.pdfIn PDF document text
    • http://kegolij.iblogger.org/74591094974.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4365560/normal_5fc95a502a410.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447265/normal_601edfd53039a.pdfIn PDF document text
    • http://nuzenurego.22web.org/affairscloud_computer_capsule.pdfIn PDF document text
    • http://copyrightsupporteds.com/445746679654t9c9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454988/normal_5ff1f7c6559f2.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fazafowunop.epizy.com/alfredo_olivas_el_paciente.pdfIn PDF document text
    • http://xapusadezed.rf.gd/datasimapirerurukexupizaz.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_off0000e0bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0BD 5208 bytes
SHA-256: b745e700868eb3ff1a5cf7f105db191bec02d084454ff1a9f308f9df5ed2bcaa
font_01_sfnt_off0000f265.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF265 10648 bytes
SHA-256: fda27b2eb2ffac858c93545503853a41e7a15bb24cbcdaf9839cca7515e11903

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