Malicious PDF — malware analysis report

Static analysis result for SHA-256 74d24a45bdfdae77…

MALICIOUS

PDF

41.3 KB Created: 2020-05-02 19:52:08 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 95f80cf0b3d4773bc4eb71275c86b9d3 SHA-1: b8289365739c21166114fdf5c21a5fcc6efee240 SHA-256: 74d24a45bdfdae775a031bb7135edcf05b55cb730d5805f70987a61c407c8c78
104 Risk Score

Malware Insights

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

The PDF document contains a lure related to a 'Voucher format in tamil' and embeds numerous external links, many of which point to other PDF files. The heuristic 'PDF_SEO_LINK_FARM' indicates a mass of external links, suggesting a phishing or malware distribution scheme. The ML classifier strongly flagged this PDF as malicious, supporting the conclusion that it is designed to lead users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

Heuristics 5

  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://rosslynscott.com/uploads/1/3/1/4/131407110/131407110.html#voucher+format+in+tamil
    • http://allsofuckinggood.com/uploads/1/3/0/7/130776316/gajazimegogizopujiba.pdf
    • http://kelleyandgeorge.com/uploads/1/3/0/2/130270889/puxozuke.pdf
    • http://victoriaelizabethdesign.com/uploads/1/3/0/2/130273626/gupulumedo.pdf
    • http://untdsportson.com/uploads/1/3/1/3/131380707/a98b38.pdf
    • http://karmapashamarnag.com/uploads/1/3/1/8/131856705/jibim.pdf
    • http://abmphpa.net/uploads/1/3/0/7/130739558/acad31.pdf
    • http://aacbusiness.com/uploads/1/3/1/3/131383427/36570bb170e0.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_off0000771b.bin
bedb704d138bbe9f904deb77a9cafcb1297310f1ddc01f5452a3a3a249d6568a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x771B 8716 bytes

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