Malicious PDF — malware analysis report

Static analysis result for SHA-256 87f837ccb7613b0a…

MALICIOUS

PDF

74.1 KB Created: 2020-11-14 07:49:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 90a63743d4dc04506f55e71b5354ca21 SHA-1: 195a73ff855a0927c0efcb745f9c5883691bf12e SHA-256: 87f837ccb7613b0aa5bbcb47ed010fd02ef85a8c52623f83445c99fdf32aeca9
156 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, indicating a phishing or malware distribution attempt. It contains numerous external links, including one to 'traffset.ru', suggesting it's part of a link farm or redirection scheme to deliver malicious content. No scripts were extracted, but the PDF structure and link farm heuristic point towards an attempt to direct users to potentially harmful external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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 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.
  • 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://traffset.ru/123?utm_term=fallout+3+enclave+radio PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4381751/normal_5fa2f37c5bc8a.pdfIn PDF document text
    • https://zubosevofugojat.weebly.com/uploads/1/3/4/3/134307347/dagidedenekited-novowolusavoga-nabuleropukod-bivametikixim.pdfIn PDF document text
    • https://metaxilam.weebly.com/uploads/1/3/4/7/134723413/09bdeb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366055/normal_5f872f1917703.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374696/normal_5f9264cd5efbf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375518/normal_5f896cd30206f.pdfIn PDF document text
    • https://wufikasokuwomoz.weebly.com/uploads/1/3/4/3/134359410/foxefakavovapi-sakabewi.pdfIn PDF document text
    • https://bizumoku.weebly.com/uploads/1/3/2/6/132681494/xijijanosobu.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/vapite/bogaxil.pdfIn PDF document text
    • https://s3.amazonaws.com/sorogamat/4802965693.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dbfd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBFD 2984 bytes
SHA-256: c8346471fc41b33684d5c9cfce5395cdb3133681ea4262792607f001fe111227
font_01_sfnt_off0000e6ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6AC 4932 bytes
SHA-256: e18c457e85910fed51e74c23993e9eba0ebb9113f50e3e4212d619008b519300
font_02_sfnt_off0000f78d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF78D 10692 bytes
SHA-256: 7bd2489a5e02ae815e8af2dcaa52a92b7843b9cba07c1f490b9ede44bc82cbc0

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