Malicious PDF — malware analysis report

Static analysis result for SHA-256 748de74e58daa8b7…

MALICIOUS

PDF

45.0 KB Created: 2020-04-22 04:42:22 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 7e5d659b6d2950850d95d81c5b07a36c SHA-1: e6bb9c76f659407e73243c399d1562a4d57e3029 SHA-256: 748de74e58daa8b7147894cdfe9209a10085fedd2a8550ce172c4af380e5c9c2
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of external links, many of which point to other PDFs hosted on similarly named domains, suggesting a link farm or redirection scheme. The document body, though heavily obfuscated, contains text related to a 'State of Florida financial affidavit form' and references the wkhtmltopdf tool, indicating a potential lure for users seeking official documents. The ML classifier strongly flagged this PDF as malicious, and the extensive external linking supports a malicious intent, likely to redirect users to phishing sites or download further malicious content.

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://digitaldocmd.com/uploads/1/3/0/5/130590229/130590229.html#state+of+florida+financial+affidavit+form
    • http://shopluminary.com/uploads/1/3/0/6/130621225/6499915.pdf
    • http://treeservicetravelersrest.com/uploads/1/3/1/0/131070912/bugegexafegox.pdf
    • http://ambienceflooringaustralia.com/uploads/1/3/0/9/130969750/8339121.pdf
    • http://duenorthdoublereed.com/uploads/1/3/0/7/130740566/bivivokimume.pdf
    • http://infycapital.com/uploads/1/3/1/4/131452754/7293044.pdf
    • http://afora.us/uploads/1/3/0/6/130621401/6800997.pdf
    • http://sunshinecollegeconsulting.net/uploads/1/3/0/6/130604699/pupofug.pdf
    • http://acecarpettiles.com/uploads/1/3/0/6/130621785/7031489a16bdfc2.pdf
    • http://archosarchaeology.com/uploads/1/3/0/6/130621502/97751338a40da.pdf
    • http://airway-innovations.com/uploads/1/3/1/0/131071159/migudifexuretu.pdf
    • http://heartandhomechef.com/uploads/1/3/0/7/130740344/napixuli.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_off0000877a.bin
3e106d2ab13575b06d8ab11fc3a2df46e844991bdeae8c721ec376633df5116b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x877A 8472 bytes

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