Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b2f55b76e49ce11…

MALICIOUS

PDF

45.3 KB Created: 2020-04-09 05:57:01 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 57e5387b9256a80d54cd8a9f5e5255e5 SHA-1: bf108666b91b42939a6fce290a47238bc3d1a032 SHA-256: 0b2f55b76e49ce11d4f2a26ed263725ee65119138a4df9bca3828c0412e0dcd7
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting it is part of a link farm or SEO spam campaign. The document body, though heavily obfuscated, contains text related to 'truckers log book' and includes URLs that point to other PDF files or HTML pages. The ML classifier strongly flagged this PDF as malicious, indicating a high probability of malicious intent.

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://reikiamongus.com/uploads/1/3/0/6/130604372/130604372.html#how+to+properly+fill+out+a+truckers+log+book
    • http://texastasteofheaven.com/uploads/1/3/0/5/130590550/sexalak-mexabumakowijev-bakixoxi-wagugepu.pdf
    • http://dubldcontracting.com/uploads/1/3/0/6/130639812/werev-xobigodonidipu.pdf
    • http://wedgesoverworkdays.com/uploads/1/3/0/5/130588596/tovukifup-xilidigiboze-janonimosiboxem.pdf
    • http://medicalsafetydevices.net/uploads/1/3/0/6/130604724/bokexatumapubatigele.pdf
    • http://revolvebuilders.com/uploads/1/3/0/2/130287953/kutafi.pdf
    • http://weeblee.net/uploads/1/3/0/8/130874554/sulagibi.pdf
    • http://men4jesusalvintx.org/uploads/1/3/0/2/130289235/d3999a85.pdf
    • http://vuteck.com/uploads/1/3/0/5/130550714/gomemenenifewag.pdf
    • http://laurenhillcounseling.com/uploads/1/3/0/8/130813913/kexurelexalotasakaji.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_off00007452.bin
dc8e37ba796e00cea0a2697084edc47c994f4fe22307bc97dda9ddff4636c7ee		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7452 8036 bytes
font_01_sfnt_off0000936c.bin
779aa567746046747dac965df7fdfb06ff632674a0a99ce247a327bf89f0fa63		 pdf-font-stream PDF embedded font (sfnt) at offset 0x936C 16036 bytes

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