Malicious PDF — malware analysis report

Static analysis result for SHA-256 96bb3702b13cb800…

MALICIOUS

PDF

40.3 KB Created: 2020-04-14 15:16:16 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: f19a02453c9ea4d274125a38ce086bda SHA-1: aaeec5c53190b8263354a2477790694de5a88dd7 SHA-256: 96bb3702b13cb8003c965e6707f2faa28ee3ed62abf6fdd78103f51504f7d6b1
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF document contains numerous external links, with a primary focus on a link disguised as an 'attendance allowance form'. The ML classifier strongly indicates maliciousness. The presence of a link farm heuristic suggests an attempt to manipulate search engine results or distribute malicious content across multiple domains. No scripts were extracted, but the document's structure and embedded links point towards a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://onlydons.com/uploads/1/3/0/2/130287538/130287538.html#attendance+allowance+form
    • http://howeforsheriff.com/uploads/1/3/1/4/131437268/1134400.pdf
    • http://sperogolubfoundation.org/uploads/1/3/1/4/131454466/finuf.pdf
    • http://thehandmadedogbedcompany.com/uploads/1/3/0/5/130540405/sugidiz_zitojesaxo_defirus.pdf
    • http://beanbagswim.com/uploads/1/3/0/6/130639879/d95bad966df.pdf
    • http://retreatinsider.com/uploads/1/3/0/8/130813777/suvenepizobumap.pdf
    • http://cherylanntaylor.com/uploads/1/3/0/7/130739405/koboduma.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_off0000753a.bin
8934e8194b068b6dafdc1b97f4c3da2fa5039bb0b086ccf31f067c82d87723d1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x753A 7912 bytes

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