Malicious PDF — malware analysis report

Static analysis result for SHA-256 36bb6b6d38c953a1…

MALICIOUS

PDF

69.8 KB Created: 2021-01-18 14:09:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: ed8178723ba47f5b19f202150a8ec2b7 SHA-1: c965845eb12d22833fdc2ba1d9df7940d855f0df SHA-256: 36bb6b6d38c953a1e873ec8033056d664e3d6a34d5fbe26f9e626ee1285e412c
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing operation. The document body, though heavily obfuscated, contains metadata related to wkhtmltopdf and a date, but no clear textual lure. No scripts were extracted, but the PDF structure itself facilitates the redirection to numerous external URLs.

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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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=hemorragia+gastrointestinal+causas PDF link annotation
    • https://cdn.sqhk.co/vosizijanad/Yhigfij/ballet_at_home_youtube_channel.pdfIn PDF document text
    • https://cdn.sqhk.co/jisepozidis/q37ibp6/norafurazukeku.pdfIn PDF document text
    • https://cdn.sqhk.co/jabezoxujo/Mttgijf/47946876924.pdfIn PDF document text
    • https://gajifawegux.weebly.com/uploads/1/3/4/6/134649352/mejejojafun_gamodaje_deputipo.pdfIn PDF document text
    • https://teguvubab.weebly.com/uploads/1/3/4/3/134347924/819c06608bb1066.pdfIn PDF document text
    • https://lajojixuvoporor.weebly.com/uploads/1/3/0/7/130738555/3240114.pdfIn PDF document text
    • https://site-1210859.mozfiles.com/files/1210859/38293637424.pdfIn PDF document text
    • https://cdn.sqhk.co/kawonidoza/fijlRgf/fosovimemo.pdfIn PDF document text
    • https://junoxavod.weebly.com/uploads/1/3/1/3/131384771/3692743.pdfIn PDF document text
    • https://cdn.sqhk.co/sigidezok/2XrDjfc/xuzexagofuronevamikon.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nuvitaros.epizy.com/free_templates_admin_bootstrap_4.pdfIn PDF document text
    • http://pibekolovaxizon.epizy.com/73064696520.pdfIn PDF document text
    • http://wedizakur.epizy.com/97186022387.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_off0000d412.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD412 5080 bytes
SHA-256: 8b322fa860e3fb569a376671816e03b9ece1cef54ee8e970035edfecae6f8e50
font_01_sfnt_off0000e53e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE53E 11100 bytes
SHA-256: 98e4d529052e0ece42714851dd2fc5a8977a4a59b811be16ca403b39c861a5af

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