Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f7b0c68e710dc81…

MALICIOUS

PDF

32.4 KB Created: 2020-04-02 16:32:19 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 796a32a10eed067d6cdca27751036af3 SHA-1: 083858cea5a25e0b91b6f0233011a6b61974fe56 SHA-256: 5f7b0c68e710dc81dfab26243206f66aa7797eb399778133753c5ce7fd0d43bf
96 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a link farm, suggesting a malicious intent to manipulate search engine results or redirect users to potentially harmful content. The ML classifier strongly flagged this PDF as malicious. No scripts were extracted, but the embedded URLs are the primary indicators of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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://bigdsuperfoods.com/uploads/1/3/0/3/130313340/130313340.html#ashley+schaeffer+bmw
    • http://multimodalresearchteam.com/uploads/1/3/1/0/131070973/e9601af98b2920.pdf
    • http://studypeds.com/uploads/1/3/0/4/130435777/954ea5963.pdf
    • http://mercerlanecollective.com/uploads/1/3/0/8/130814579/vafab-boluwev.pdf
    • http://housemary.com/uploads/1/3/1/4/131453397/mowiwafip_xeparawawik_mesita_gasarefusar.pdf
    • http://fash-inhouse.com/uploads/1/3/0/6/130604948/16b4b8ad1a858.pdf
    • http://fivefoldfellowship.com/uploads/1/3/0/5/130588199/3b30f9b82d0b.pdf
    • http://gtmobileautorepair.net/uploads/1/3/0/4/130483895/9247485.pdf
    • http://planblegacy.com/uploads/1/3/0/3/130323656/fa42f74.pdf
    • http://procdm.nl/uploads/1/3/0/7/130775522/8808bd7fcf803b.pdf
    • http://weshiftparadigms.com/uploads/1/3/0/4/130483856/5688192.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 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000572a.bin
a1ebbf132e4e4562b8c85ff942546f4208e1b788a38096e1ec1fc556e492c5b1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x572A 7612 bytes

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