Malicious PDF — malware analysis report

Static analysis result for SHA-256 f70097cb65430f67…

MALICIOUS

PDF

35.6 KB Created: 2020-05-13 02:10:02 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: c7c6800ba01dabaea0469b2143668f86 SHA-1: 17592f8d26ea4d8e280ae6a38f0b539a7d013bb6 SHA-256: f70097cb65430f6706b934c55d31935464bb6017c71bd9e66f33379566e4fd5a
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of external links to various domains, many of which follow a similar numeric or keyword-based slug pattern, indicating a link farm or SEO abuse tactic. The ML classifier strongly flagged this PDF as malicious. The primary attack pattern involves directing users to a network of seemingly unrelated PDF documents hosted on different websites, likely as a method for content delivery or further redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 4

  • 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.
  • 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 http://theniversons.com/uploads/1/3/0/4/130476709/130476709.html#davis+drug+guide+book+for+nurses
    • http://drgservices.info/uploads/1/3/0/8/130813614/toxedemuwaku_xajodo.pdf
    • http://admiralmedicalmanagementgroup.com/uploads/1/3/0/9/130969212/minavukotujobu_jixobutowa_wiwesa.pdf
    • http://whaletaletheatre.org/uploads/1/3/0/6/130604841/miresopizalar.pdf
    • http://serenitycosmetcidental.com/uploads/1/3/0/8/130874031/e945103.pdf
    • http://n-afs.com/uploads/1/3/0/8/130814290/mabuwufiwogas.pdf
    • http://markjawad.com/uploads/1/3/1/1/131163691/tupulikiwegen.pdf
    • http://henrycosaddleclub.com/uploads/1/3/1/4/131438639/8086175.pdf
    • http://mcnealaccountingplus.com/uploads/1/3/0/2/130287942/lorimek.pdf
    • http://my-art-by-geri.com/uploads/1/3/0/7/130775868/564448d43.pdf
    • http://freedom-america-inc.com/uploads/1/3/0/6/130639514/4473020.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000057d3.bin
a36eee06fef6ce219692c4ec918276ac99413e4fd1e3666e4031624f9289d620		 pdf-font-stream PDF embedded font (sfnt) at offset 0x57D3 1800 bytes
font_01_sfnt_off0000605f.bin
60781b7437fc30e19047710db5a3198e5915794c669b2c31fc4c4d9b1db849fd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x605F 10064 bytes

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