Malicious PDF — malware analysis report

Static analysis result for SHA-256 c70b34e06932cad4…

MALICIOUS

PDF

74.7 KB Created: 2021-02-16 12:46:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: 6140e77b1f6302ee0813e74e93b9f592 SHA-1: 6a6f1995e421d35fa281b49ebb04bf804106c9b3 SHA-256: c70b34e06932cad4adfabd319300554303f7e482e2319eb4bd1a9477aff33f2b
126 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs, many of which point to disposable hosting and appear to be part of a link farm, suggesting a phishing or malware distribution attempt. The document body, though heavily obfuscated, contains text related to 'wkhtmltopdf' and a Cisco network specialist, likely a lure to entice users to click the malicious links. No scripts were extracted, but the PDF structure and URL patterns are indicative of a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://bologen.ru/123?utm_term=what+does+a+cisco+network+specialist+do PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4470209/normal_601a1d2aa0efb.pdfIn PDF document text
    • https://gegivibubijob.weebly.com/uploads/1/3/4/5/134507206/278bc9d7fa0e00.pdfIn PDF document text
    • https://cdn.sqhk.co/goworonol/gihijay/ps1_emulator_android_apk_bios.pdfIn PDF document text
    • https://pojojupekofep.weebly.com/uploads/1/3/4/7/134754506/lubuz.pdfIn PDF document text
    • https://cdn.sqhk.co/devuzemalut/gcgfijC/xukedalekojupajanuk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455208/normal_601217a97108d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4418584/normal_600680a31a580.pdfIn PDF document text
    • http://omynutural.space/freeze_dried_food_for_dogs_with_cancerctkyy.pdfIn PDF document text
    • http://perevod24-card2card.site/equinox_brooklyn_heights_schedule60ciz.pdfIn PDF document text
    • https://cdn.sqhk.co/nemisova/hahhghQ/kinder_surprise_eggs_games_online.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4493920/normal_5ffb461ef0478.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368242/normal_6019f4a3bafc5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464734/normal_601ebe8d8b936.pdfIn PDF document text
    • http://zespodsvetkoy.site/90123360131g6v3v.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375344/normal_6020556e369c4.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/polexebuj/java_1._8_0_171.pdfIn PDF document text
    • https://s3.amazonaws.com/xakusineba/wapipenulifiruzeguzo.pdfIn PDF document text
    • https://s3.amazonaws.com/polexebuj/java_servlet_mcq_with_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/ravuxudibure/poxilagixope.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_off0000e706.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE706 5332 bytes
SHA-256: 17205103e9d4c106c5b0211a83d3bc4c54ff6391aee9dd4f75d5a49a1dcc3a06
font_01_sfnt_off0000f93e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF93E 10664 bytes
SHA-256: 235ed04c1271585afb7f2984b43d76183857e17e516a60e285afea1e429badd1

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