Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c38dc8342b53360…

MALICIOUS

PDF

46.3 KB Created: 2020-03-23 08:59:04 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 96acc62b80617e4255c039a355b44c74 SHA-1: 000e9653db4e2b160a9b972c9fb9c9ded4db74b9 SHA-256: 6c38dc8342b533609d54d939d0e260b202797aef181b37ac6fa1ce09d2144879
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, identified by the PDF_SEO_LINK_FARM heuristic. The ML classifier also flagged this PDF as malicious with high confidence. The document body, though partially corrupted, contains URLs that are part of this link farm, suggesting a likely SEO manipulation or content redirection scheme. No scripts were extracted from this sample.

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://klokkeraadgivning.com/uploads/1/3/0/6/130604232/130604232.html#gastronomia+prehispanica+mexico
    • http://newenglandgirlsnpl.com/uploads/1/3/0/5/130543368/venudexopoluxo.pdf
    • http://webmail.pleikuab.com/uploads/1/3/0/4/130483132/4065496.pdf
    • http://the-ecobarn.com/uploads/1/3/0/5/130588572/009834bf.pdf
    • http://myaffiliatepages.net/uploads/1/3/0/5/130588169/nefuxab.pdf
    • http://premaconsulting.com/uploads/1/3/0/3/130323362/nisonozopidenegaj.pdf
    • http://nba-talk.com/uploads/1/3/0/5/130543538/529615.pdf
    • http://bvntheatre.org/uploads/1/3/0/6/130621506/8668507.pdf
    • http://webmail.privateofficemail.com/uploads/1/3/0/4/130490193/8286808.pdf
    • http://theupperdeck.org/uploads/1/3/0/7/130739351/texusamu.pdf
    • http://medicalmarijuanamiracle.com/uploads/1/3/0/5/130551067/mukati_rarikujopomapu.pdf
    • http://teach2shoot.com/uploads/1/3/1/0/131069923/6bfbc59c9c.pdf
    • http://swimsuitsecrets.com/uploads/1/3/0/2/130289530/43e878d3.pdf
    • http://jifga.org/uploads/1/3/0/4/130436093/7527827.pdf
    • http://caninecompanionkollege.com/uploads/1/3/0/7/130740049/7455760.pdf
    • http://somemecosmetics.com/uploads/1/3/0/8/130873951/bavemiremojelav.pdf
    • http://9roundmemphis.com/uploads/1/3/0/2/130291507/36b80e5f.pdf
    • http://sliceoffeist.com/uploads/1/3/0/7/130776113/mekowugudisoxaw.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_off000072bb.bin
c9c4bbd9f964d3062a19365740436cc0ce63aaa7bf78c1d5818dd1a7a852010c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x72BB 9600 bytes
font_01_sfnt_off00009547.bin
779aa567746046747dac965df7fdfb06ff632674a0a99ce247a327bf89f0fa63		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9547 16036 bytes

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