Malicious PDF — malware analysis report

Static analysis result for SHA-256 728f8aad579d6bd2…

MALICIOUS

PDF

41.0 KB Created: 2020-04-04 10:10:03 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: f2f029a9cb91a4fb674fceafd7b99621 SHA-1: 485dc64b875cdc371f83c9655691b4635d4fad05 SHA-256: 728f8aad579d6bd205bf72692e53c2401b31990cba95fb9739fc5edf10c33303
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document contains a large number of embedded external links, as indicated by the 'PDF_SEO_LINK_FARM' heuristic. These links point to various domains, suggesting a coordinated effort to redirect users. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted, but the primary attack vector appears to be the manipulation of document content to drive traffic to potentially malicious external resources.

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://annettemencke.com/uploads/1/3/0/3/130313488/130313488.html#que+significa+color+purpura+en+la+biblia
    • http://centerforcosmicengineering.com/uploads/1/3/0/7/130775832/6371177.pdf
    • http://freemasoninfo.com/uploads/1/3/0/2/130289803/f4d4667.pdf
    • http://keiltravel.com/uploads/1/3/0/2/130289800/rabisesemut.pdf
    • http://screenirelandguilds.com/uploads/1/3/1/3/131379938/1328381.pdf
    • http://abcarpentryllc.com/uploads/1/3/0/9/130969682/7ba283fd93776f5.pdf
    • http://fivestarhomestays.com/uploads/1/3/1/3/131379485/fobadiferad-remozale-givatajedumosa-dipazafadiko.pdf
    • http://candidlyboudoir.com/uploads/1/3/0/9/130969562/botafa.pdf
    • http://alienfirsts.com/uploads/1/3/0/5/130550672/9089230.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://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000061b1.bin
943e3e561fc355f01e686db55577cc19eacf2e351319b72a879b911ddffc054d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x61B1 8504 bytes
font_01_sfnt_off00008063.bin
779aa567746046747dac965df7fdfb06ff632674a0a99ce247a327bf89f0fa63		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8063 16036 bytes

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