Malicious PDF — malware analysis report

Static analysis result for SHA-256 c093aea9fbeff5d5…

MALICIOUS

PDF

71.0 KB Created: 2020-12-25 19:43:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 56076602455768b16f333c7ecd5f9a39 SHA-1: 79ceb19fb7c9059a94a245aa434849c1c0f580be SHA-256: c093aea9fbeff5d57ea18e93bfc28e2a4b9be6cf1e4924ec639a4b67a1fd7bb0
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, identified as a 'PDF_SEO_LINK_FARM' heuristic. The primary URL, 'https://traffset.ru/aws?utm_term=all+hallows+penwortham+school+uniform', and numerous other Weebly and Strikingly hosted PDF links suggest an attempt to manipulate search engine results or redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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/aws?utm_term=all+hallows+penwortham+school+uniform
    • https://ridolagu.weebly.com/uploads/1/3/0/7/130775195/solunopopevuve.pdf
    • https://durunefa.weebly.com/uploads/1/3/4/7/134712847/jarimirow.pdf
    • https://pedomolakikivo.weebly.com/uploads/1/3/4/4/134440841/1e44a1.pdf
    • https://zelezolure.weebly.com/uploads/1/3/4/3/134315846/b1eae5.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/a838aeda-a7b2-4984-bab3-5a1e37258dc0/womivabulesimorus.pdf
    • https://uploads.strikinglycdn.com/files/1502463f-336b-44de-9c77-d36926abcf13/62743293322.pdf
    • https://uploads.strikinglycdn.com/files/d2c2a86c-bb60-4357-8541-018e86271a07/wugagakinizuwavuzepejudis.pdf
    • https://uploads.strikinglycdn.com/files/91fcacb6-12c8-49ab-883b-48b97c7caa4a/42368583752.pdf
    • https://uploads.strikinglycdn.com/files/a5e5431c-4299-4683-b83f-0cc65c7bdb60/gagaxa.pdf
    • https://uploads.strikinglycdn.com/files/2a55bcce-aa0c-4db9-9ee0-d7e97b2dec9b/77985605268.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d72e.bin
f6b43d2daf2afd74a8dcbb230aafc30cc5b382cbf066e968449b9dd3de1e7c7c
pdf-font-stream PDF embedded font (sfnt) at offset 0xD72E 5336 bytes
font_01_sfnt_off0000e93d.bin
9ca4283dd21a79f6efbc75e80be7a87a1885adbac433558933b70f98ab7e3264
pdf-font-stream PDF embedded font (sfnt) at offset 0xE93D 11348 bytes