Malicious PDF — malware analysis report

Static analysis result for SHA-256 a17f9e684b5a604b…

MALICIOUS

PDF

59.6 KB Created: 2020-04-05 15:46:51 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 16ad51de9cb5e1cf41f22cf7a2578e7f SHA-1: 1bdec01764f3f2065a0016cec620594b5b7561b4 SHA-256: a17f9e684b5a604b4d6df2481caf88d58763793845e13021248ebde7f651bb69
94 Risk Score

Malware Insights

MITRE ATT&CK
T1598 Gather Victim Identity Information T1204 Malicious Link

The PDF file contains a large number of external links to other PDF files hosted on various domains, indicating a link farm or distribution network. The ML classifier strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains references to the Bissell Proheat Turbo and wkhtmltopdf, suggesting a potential lure or context for the distributed links.

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://absconstruct.org/uploads/1/3/0/4/130476607/130476607.html#bissell+proheat+turbo+no+suction
    • http://criticdata.com/uploads/1/3/0/5/130589072/sawugulopizurozaler.pdf
    • http://wildpanzy.com/uploads/1/3/0/7/130775306/5d93c5906.pdf
    • http://avavilihughes.net/uploads/1/3/0/6/130604615/vokejagubudobabikuz.pdf
    • http://homecinemas.ie/uploads/1/3/1/1/131164002/7144121.pdf
    • http://albatrossinv.com/uploads/1/3/0/8/130813054/41ff99b9.pdf
    • http://genesislandllc.com/uploads/1/3/1/4/131437029/magizakakotul.pdf
    • http://inspired4610.com/uploads/1/3/0/7/130739256/robub-zulalo-xidibatapudin.pdf
    • http://bonardbars.com/uploads/1/3/0/5/130546392/2c3b72a1.pdf
    • http://allierenner.com/uploads/1/3/1/3/131380343/9542583.pdf
    • http://mta-sts.fsm-solution.com/uploads/1/3/0/4/130483045/1904468.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_off0000c464.bin
a2a660f3f6ac8c18f1b084476a51e99b71a93d9fb43bec11236527ede175fc36		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC464 7416 bytes

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