Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb54a0a181d48b3a…

MALICIOUS

PDF

66.2 KB Created: 2021-02-16 10:28:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 92150bb31b53f478d86001eb57fc7cc0 SHA-1: 3897832956475fac93232707a400c3f5259fcd08 SHA-256: cb54a0a181d48b3ab23f23b27b8eea4972320b200da939910f25a384ac57a1fe
126 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. It contains numerous embedded URLs, many pointing to disposable domains or link farms, suggesting an attempt to redirect users to malicious content. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a link farm on disposable hosting. While no scripts were explicitly extracted, the nature of the heuristics and the numerous URLs strongly suggest a phishing or malware distribution attempt.

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://jottigo.ru/wb?keyword=understanding%20media%20mcluhan%20epub PDF link annotation
    • https://cdn.sqhk.co/pulijidapis/iickjjM/jebojijuvovofeso.pdfIn PDF document text
    • http://bettyloustintruckbbq.com/gowimajemarezitexjn7r9.pdfIn PDF document text
    • http://itanto.space/64707904741qyeg.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403820/normal_601e84ff51e67.pdfIn PDF document text
    • http://gimakelodikovij.iblogger.org/60th_birthday_invitation_template_word.pdfIn PDF document text
    • https://cdn.sqhk.co/figakeves/KcNjcFS/nivebaxovurijujivebixixu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454807/normal_5fe8adefca29c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451566/normal_601e58379c5bc.pdfIn PDF document text
    • http://qunit.space/long_bone_anatomy_worksheet_answerstxr28.pdfIn PDF document text
    • https://cdn.sqhk.co/farafakilof/hRjbhbE/zasukozugigek.pdfIn PDF document text
    • http://dostafood.xyz/mexuvuzutubufanesexe8bxsj.pdfIn PDF document text
    • http://sokolov.fun/17952695240xeeb8.pdfIn PDF document text
    • http://airet.space/84801634146csxmq.pdfIn PDF document text
    • http://healthyforczechrepublic.site/frozen_movie_in_isaiminijhmww.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473053/normal_5fd1ff5642727.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000c385.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC385 5616 bytes
SHA-256: c9b45434391cb56e73bcb4ff1ba1a6b07dabdd024ba0110dabe17ea10cef47ab
font_01_sfnt_off0000d66c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD66C 11016 bytes
SHA-256: af272841d29f6b619653354833bd4caf0a3f805db3e6caf44357a78f86633919

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