Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce93e8c8bbeef7ea…

MALICIOUS

PDF

67.1 KB Created: 2020-12-07 06:46:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 52e005c615d0b4a6eb6702037a657f26 SHA-1: bb838a15f5bba53b3ec0a7e25980270ff1999282 SHA-256: ce93e8c8bbeef7ea82cb7931909d64eade4739df9c4114f665cb04073349d383
156 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, identified as a PDF_SEO_LINK_FARM heuristic, pointing to various PDF files. One of these links, 'https://traffset.ru/123?utm_term=dance+arts+center+st+joseph+mo', is flagged as an external URI and is likely the primary malicious destination. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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=dance+arts+center+st+joseph+mo
    • https://cdn-cms.f-static.net/uploads/4444852/normal_5fb73949b9453.pdf
    • https://xasuvakem.weebly.com/uploads/1/3/4/4/134400919/wewirufakomole.pdf
    • https://bisifivu.weebly.com/uploads/1/3/4/7/134724717/ruruxorosisasal.pdf
    • https://cdn-cms.f-static.net/uploads/4405197/normal_5fbc5747bd851.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/pugomonapoxuxe/brick_house_lyrics_rob_zombie.pdf
    • https://s3.amazonaws.com/dukexajuj/42259400723.pdf
    • https://s3.amazonaws.com/dixaleko/florida_standards_ela_grade_6.pdf
    • https://s3.amazonaws.com/pisedij/34226566719.pdf
    • https://s3.amazonaws.com/visagogijulep/light_wave_behavior_webquest_answer_key.pdf
    • https://s3.amazonaws.com/zagubip/winrar_windows_10_filehippo.pdf
    • https://static1.squarespace.com/static/5fc0f41f116eb00e3c4c3887/t/5fc6f268e2dcb1274de188ff/1606873704735/93872824396.pdf
    • https://s3.amazonaws.com/tugumeb/malunupiminez.pdf
    • https://static1.squarespace.com/static/5fc27e0b2cf09257bd761280/t/5fc37216e6d49a06bbfea2ed/1606644246539/dua_after_eating.pdf
    • https://s3.amazonaws.com/vukumesoj/13861765264.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b2c1.bin
f98c1b67f8fa95fe2c47e8093d6f68a65c8f1f93cac6e45834e2b2c487b257e5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB2C1 5216 bytes
font_01_sfnt_off0000c460.bin
14e62422e5f18dc064c3c735235ab0e9d4584c56b94323367b45ce1ed65bd6b5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC460 11600 bytes
font_02_sfnt_off0000e8ca.bin
a95eff378c135b1ab40d10b3cd1da1bafbc07f86005f57898d079c90d712ddbd		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE8CA 16204 bytes

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