Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff1e12676c766387…

MALICIOUS

PDF

82.2 KB Created: 2020-11-11 18:15:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3d4d221e9258a3f00026e82966a0d7d4 SHA-1: d83f1b5f698fe05ff101629e0af4788338b9789d SHA-256: ff1e12676c766387306422e5e86632b18edee9942b5eca2a5e3f52300d6c348d
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, as indicated by the PDF_SEO_LINK_FARM heuristic, with one prominent URL being https://traffking.ru/aws?utm_term=twitter+video+ios. The ClamAV detection and ML classifier also flag this file as malicious, specifically as a phishing trojan. While no scripts were explicitly extracted, the nature of the link farm suggests an attempt to direct users to malicious or deceptive websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://traffking.ru/aws?utm_term=twitter+video+ios
    • https://pudufanosi.weebly.com/uploads/1/3/4/3/134324904/6955966.pdf
    • https://cdn-cms.f-static.net/uploads/4366308/normal_5f91532bab098.pdf
    • https://cdn-cms.f-static.net/uploads/4417033/normal_5f9ea667e190c.pdf
    • https://cdn-cms.f-static.net/uploads/4366982/normal_5f9a36dc6f2b6.pdf
    • https://cdn-cms.f-static.net/uploads/4448746/normal_5fa220fba79f2.pdf
    • https://cdn-cms.f-static.net/uploads/4387224/normal_5f8ea16692ac6.pdf
    • https://cdn-cms.f-static.net/uploads/4410989/normal_5fa6250c6fae3.pdf
    • https://cdn-cms.f-static.net/uploads/4393759/normal_5f9c68ce9e6a0.pdf
    • https://cdn-cms.f-static.net/uploads/4427785/normal_5fa12c87bb31f.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/ronenitevodo/it_worksheet_english_medium.pdf
    • https://s3.amazonaws.com/fapaga/dance_with_the_devil_book.pdf
    • https://s3.amazonaws.com/bofake/loriride.pdf
    • https://s3.amazonaws.com/pazifetanegapu/wejop.pdf
    • https://s3.amazonaws.com/leteraxewe/univega_viva_sport_history.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_off0000d6b2.bin
5849e9d5519e589a82bc2a3d0d717fdcdb877fb96ec39d4948a8d2535314e8c2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD6B2 4676 bytes
font_01_sfnt_off0000e6b9.bin
4e194a27981473ebd2309dff6c03b0dd68f771649db1c5429bb7b469d96b203f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE6B9 8184 bytes
font_02_sfnt_off0000fd0c.bin
ee79201ec3781c2ed1c3fd84ad9707c9fb96c78cbf0ccc6690615d43fb1626bf		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFD0C 11228 bytes
font_03_sfnt_off00012367.bin
9a73e35fd158bd23e7ebc701902b6e2c5975cfb968036478fb9bc76b5e98a123		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12367 17096 bytes

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