Malicious PDF — malware analysis report

Static analysis result for SHA-256 6cf213dd153f8c8a…

MALICIOUS

PDF

34.1 KB Created: 2020-06-07 00:00:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3bd0e62cf4044e9eb15837de359e5311 SHA-1: 92f76b8dea2559dc99d701b01758bca254e6b8a5 SHA-256: 6cf213dd153f8c8ad9d645ee14d39f363384c2a9230d928a2feb4590b5b54115
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 distribution mechanism. The ML classifier strongly indicates maliciousness. While no scripts were directly extracted, the presence of embedded URLs and the nature of the link farm point towards a malicious intent, possibly to lure users to malicious sites or to manipulate search engine rankings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://f4a2b2.bdgct.com/uploads/1/3/0/7/130775451/130775451.html#costanzo+physiology+pdf
    • http://paltechnologyenterprises.com/uploads/1/3/0/7/130775123/xarefofesuzar.pdf
    • http://littlemissbradshaw.com/uploads/1/3/1/3/131381241/moraraz.pdf
    • http://armstrongenvironmental.org/uploads/1/3/0/2/130289694/7052622.pdf
    • http://beebeenuts.com/uploads/1/3/1/8/131856446/2c0fdef5cfd770.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://venedemabu.files.wordpress.com/2020/06/senazifilumupotewiriputo.pdf
    • https://gutagaperub.files.wordpress.com/2020/06/35534583505.pdf
    • https://duravav.files.wordpress.com/2020/06/xizotibodopo.pdf
    • https://dadikopur.files.wordpress.com/2020/06/38505320048.pdf
    • https://bivuwid.files.wordpress.com/2020/06/99514591901.pdf
    • https://fagasufirosi.files.wordpress.com/2020/06/tipuw.pdf
    • https://tuforomo.files.wordpress.com/2020/06/3598744831.pdf
    • https://nuxidavu.files.wordpress.com/2020/06/5004749312.pdf
    • https://loxalosoder983445856.files.wordpress.com/2020/06/juwapiruribezepopago.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_off0000585b.bin
aa233afae3b58aa97af625eb0fcc94fd01da0958f013c1fcbcae71b91cafc5e2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x585B 10944 bytes

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