Malicious PDF — malware analysis report

Static analysis result for SHA-256 64a43f789f706ba6…

MALICIOUS

PDF

32.5 KB Created: 2020-05-28 23:42:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1f7583d1552ee15bf19bd9d4dbed2bf5 SHA-1: 8658fec34cc218bb3932d013df101349dd74a187 SHA-256: 64a43f789f706ba64250bc03e900cb555c0031748e824cd3aff4a2fcdbfd0374
96 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or redirection scheme. The ML classifier also strongly indicated maliciousness. While no scripts were extracted, the sheer volume of outbound links points to a malicious intent, likely to manipulate search engine rankings or redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://myreflectionsjournal.org/uploads/1/3/0/5/130539457/130539457.html#tolerance+stack+up+analysis+examples
    • http://hotpotato123.com/uploads/1/3/0/5/130551212/veneduwojibivet.pdf
    • http://eiastudio.net/uploads/1/3/0/7/130739081/fcd7dd764431da3.pdf
    • http://74-123-79-98.mgwnet.com/uploads/1/3/1/3/131384407/vadujun.pdf
    • http://selfloveinplainsight.com/uploads/1/3/0/3/130379475/ea8b96847897.pdf
    • http://urbanfarmdivafarms.com/uploads/1/3/0/7/130738625/c4b67dee7ce.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000533f.bin
4940f127882cd7533fe5cadf342d98bf3dd1c407779013aac2f4d2f5c6c40401		 pdf-font-stream PDF embedded font (sfnt) at offset 0x533F 10580 bytes

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