Malicious PDF — malware analysis report

Static analysis result for SHA-256 f2b78ee7187a2615…

MALICIOUS

PDF

45.2 KB Created: 2020-04-10 15:33:02 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 20623914753e832d9fffb0b4d68ff852 SHA-1: 287cd64df503623241ea3d5a9cd3a783216a72e9 SHA-256: f2b78ee7187a2615e7a3e5042e619549733edc4f945d3c63ea3443db5d16b589
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of external links to various domains, many of which appear to be part of a link farm designed for SEO manipulation. The ML classifier strongly flagged this PDF as malicious. The primary intent appears to be directing users to these external sites, which likely host further malicious content or engage in fraudulent activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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://demasidomestic.com/uploads/1/3/0/2/130271152/130271152.html#threshold+of+democracy+pdf
    • http://designer-leo.com/uploads/1/3/0/6/130620657/1280732.pdf
    • http://justasmallchapter.com/uploads/1/3/0/8/130813582/4036383.pdf
    • http://dylanmccarthyblackston.com/uploads/1/3/1/3/131384291/214048.pdf
    • http://lifestylelimousine.ca/uploads/1/3/0/6/130620801/4d610c.pdf
    • http://arizonasheritagehorse.org/uploads/1/3/0/6/130639508/rojirora.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006980.bin
4b758f82df727046c860b21f14eeb0b05e8c131a651c1a91814959d31b328085		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6980 7424 bytes
font_01_sfnt_off00008683.bin
0a74f62927e6506cf556ce04093ddaf717254a888a2313c4e0126ed6d6ed1ae5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8683 2484 bytes
font_02_sfnt_off0000900d.bin
6f4a7244d5175fbc339cb7f4160b36b0a7c0603070555e3afc7379a40d4dec81		 pdf-font-stream PDF embedded font (sfnt) at offset 0x900D 16780 bytes

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