Malicious PDF — malware analysis report

Static analysis result for SHA-256 641819571538b6c8…

MALICIOUS

PDF

51.6 KB Created: 2020-04-02 21:46:51 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: d40ecbcee3d5e2593d28729241256dc4 SHA-1: c501ce91762934beedf62bfeb01c66f9cebde0d2 SHA-256: 641819571538b6c8381e21e42be64fb521bda4663e2bcc8d691d8a41785c73ac
96 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, identified as a link farm, which is a common technique for distributing malicious content or redirecting users to phishing sites. The document body, though malformed, contains a URL that appears to be a lure. The presence of numerous external PDF links suggests an attempt to obscure the true malicious destination or to host payloads across multiple domains.

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://drdriscollaustin.net/uploads/1/3/0/5/130551086/130551086.html#the+simpsons+tapped+out+layout+guide
    • http://3drealtydesigns.com/uploads/1/3/1/3/131381135/lerenojepixati.pdf
    • http://shellsdreamtravel.com/uploads/1/3/0/6/130621844/0c7b2596377b219.pdf
    • http://myjcloveonline.com/uploads/1/3/0/5/130588272/samilexojivojaj.pdf
    • http://avvocatiperidirittiumani.org/uploads/1/3/0/2/130274319/87f64b154ff.pdf
    • http://ltsyiinc.org/uploads/1/3/0/9/130969717/mijiruw.pdf
    • http://goldenapp-sa.com/uploads/1/3/0/7/130740097/kuxufovefurota.pdf
    • http://tattoovictoriatexas.com/uploads/1/3/0/7/130739664/viwibe.pdf
    • http://thursdayschildsailing.com/uploads/1/3/0/4/130483238/suwef-soxokuja-ruwel.pdf
    • http://myoexercise.com/uploads/1/3/0/6/130620480/siketafupamusu-koril-rubaz-lugezodaxaz.pdf
    • http://makinglearningvisible.com/uploads/1/3/0/5/130588874/nipuji.pdf
    • http://slicprocess.net/uploads/1/3/0/5/130543364/fafexusoxosunol.pdf
    • http://joyofstress.com/uploads/1/3/1/1/131164552/1736938.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_off00008a73.bin
89eb4294f5ca7a5b1bc604c41e8d16cee083f503e1b8c63b2972114369c68a0f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8A73 8304 bytes
font_01_sfnt_off0000aa88.bin
32fe2ee5477977446264d381613403d87dc22e10ba7e1a3f77f57d797f4e9a15		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAA88 16356 bytes

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