Malicious PDF — malware analysis report

Static analysis result for SHA-256 70564c4d25a57795…

MALICIOUS

PDF

39.2 KB Created: 2020-06-01 13:47:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a7106aa7eb7a0d776145d31f0869e0c9 SHA-1: 5e99a002a3d35f640cf996fdeff995babb2c916c SHA-256: 70564c4d25a5779541430802075e5ac5e846510e4ec85c97a3fa044c029f626d
96 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or redirection to malicious sites. The ML classifier also strongly indicated maliciousness. While no scripts were directly extracted, the PDF structure and embedded URLs point towards a phishing or content-luring attack.

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://interrelity.com/uploads/1/3/0/4/130436163/130436163.html#lifepod+7+location+subnautica
    • http://gregpilla.com/uploads/1/3/0/6/130621719/7441874.pdf
    • http://dinamicasistemica.com/uploads/1/3/0/6/130603692/bepolerarapakewutema.pdf
    • http://crestviewpaws.club/uploads/1/3/0/3/130323454/susenilum-besikezuw.pdf
    • http://essentialsrestoringlife.com/uploads/1/3/0/3/130379216/202569.pdf
    • http://http//interrelity.com/uploads/1/3/0/4/130436163/terms.html
    • http://http//interrelity.com/uploads/1/3/0/4/130436163/dmca.html
    • http://http//interrelity.com/uploads/1/3/0/4/130436163/policy.html
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://kipevofi.files.wordpress.com/2020/05/4038989464.pdf
    • https://vemupuki.files.wordpress.com/2020/05/44789189415.pdf
    • https://jemuwad.files.wordpress.com/2020/05/bajedu.pdf
    • https://mobovowafe.files.wordpress.com/2020/05/tufevegi.pdf
    • https://dopiximodo.files.wordpress.com/2020/05/kesafidir.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://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006fb5.bin
afc984d3a79b01442448a76b825741618af8bc947ad7f3c028b3587805aabfb5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6FB5 10220 bytes

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