Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3b20752b8d994d0…

MALICIOUS

PDF

67.6 KB Created: 2020-12-14 03:41:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fcbaec3fa03d35f5d37b146c5eb230f9 SHA-1: 7c8a3e6425cfed07be8cc0ba0dfd0c0b27f2f7b1 SHA-256: f3b20752b8d994d089e7a582b11cbbad43dcfe3e9849ff4ed635b16e97f5a3e8
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 trojan threat. It contains a large number of external links, suggesting a link farm or SEO manipulation tactic. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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/123?utm_term=undercounter+radio+cd+players
    • https://cdn-cms.f-static.net/uploads/4477156/normal_5fae9b5399d51.pdf
    • https://cdn-cms.f-static.net/uploads/4385869/normal_5f902e2cca862.pdf
    • https://vidojibirulon.weebly.com/uploads/1/3/1/0/131070792/3720781.pdf
    • https://cdn-cms.f-static.net/uploads/4447916/normal_5fac0c8496f2b.pdf
    • https://xugibadibexupov.weebly.com/uploads/1/3/4/6/134684970/f735723.pdf
    • https://lonerunit.weebly.com/uploads/1/3/4/0/134017922/bisumuni.pdf
    • https://ramakizuwag.weebly.com/uploads/1/3/4/3/134321509/datijekir-tedixudukapamag-pakowijo.pdf
    • https://vawovuwowoxug.weebly.com/uploads/1/3/4/0/134040368/2642811.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/bifamomove/tungsten_network_annual_report.pdf
    • https://s3.amazonaws.com/kelukakeb/marley_station_mall_movie_times.pdf
    • https://s3.amazonaws.com/pegozegi/fusionner_2_adobe.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_off0000ce81.bin
30247f5968d4b8001e96bbaa9a12917ebd8f0f9698c95cb5fb5e76d5c5955e88		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCE81 5160 bytes
font_01_sfnt_off0000e026.bin
bb93905ecaa596404c989deb74b2030f694ec6325da777c893d5c3d387eb54c3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE026 10108 bytes

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