Malicious PDF — malware analysis report

Static analysis result for SHA-256 3cabdedc36fca26e…

MALICIOUS

PDF

73.2 KB Created: 2020-12-21 01:33:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6746b106d348449e5688b71379e6ed10 SHA-1: dbf1c92b89e39d372965247021ae8990d0d965e5 SHA-256: 3cabdedc36fca26eeb841cfcf53cd2124c981bd8c109ada80fe572587a598389
214 Risk Score

Malware Insights

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

The PDF contains a significant number of embedded links, with one identified as a malicious redirector. The presence of a ClamAV detection for 'Pdf.Phishing.Trojan' and a high ML classifier score strongly indicate malicious intent. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, a tool sometimes used to create malicious PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 5

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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
  • 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://gettraff.ru/123?utm_term=devuelveme+a+mi+chica+meaning
    • https://cdn-cms.f-static.net/uploads/4478393/normal_5fdc462431c30.pdf
    • https://cdn-cms.f-static.net/uploads/4374181/normal_5f8a2f70d229a.pdf
    • https://cdn-cms.f-static.net/uploads/4496391/normal_5fb28f517385d.pdf
    • https://cdn-cms.f-static.net/uploads/4388827/normal_5f9e3aa023be0.pdf
    • https://cdn-cms.f-static.net/uploads/4370996/normal_5f8bec69ed867.pdf
    • https://cdn-cms.f-static.net/uploads/4480755/normal_5fd8b168ab1a1.pdf
    • https://cdn-cms.f-static.net/uploads/4490380/normal_5fafe254ba049.pdf
    • https://fijojonibiw.weebly.com/uploads/1/3/2/6/132681787/jibigamefomoni.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/sukedil/52407952667.pdf
    • https://uploads.strikinglycdn.com/files/8f413922-f463-49eb-a131-4353e31cdc7a/66948608074.pdf
    • https://uploads.strikinglycdn.com/files/d37bf520-7dfa-4197-99db-baf5d4d03f48/casa_de_la_calidad_xls.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c112.bin
e22a6d1c797cc10811d2bf992ff7b944dae11f6e5e7ff8bce9123cfc0a78e530		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC112 2888 bytes
font_01_sfnt_off0000cb5b.bin
5021676f18f3304ce29b073f61e05efea329ce7d9d1afbf5f35644c9d2e55c55		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCB5B 4996 bytes
font_02_sfnt_off0000dc45.bin
dd88dada91d37779c789cb4d35ee1d769bd7e763680b60e708fb01f2b1358c34		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDC45 11048 bytes
font_03_sfnt_off00010190.bin
3b1167557c0500c78008053c404847a906c4d495ef15adec583fc97e76626070		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10190 16068 bytes

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