Malicious PDF — malware analysis report

Static analysis result for SHA-256 3890d83f19bbf298…

MALICIOUS

PDF

34.0 KB Created: 2020-04-18 19:56:27 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: dc0310d708a0a049ea397b6003fea3c5 SHA-1: 18a86fdecbcb0b40675d9356fbc75813b01bbc50 SHA-256: 3890d83f19bbf29828ed6a4329f5da7a5d4d87574e413ec5c6a420538c508675
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of external links, many of which are dynamically generated and point to unrelated domains, indicating a link farm or SEO spam tactic. The document body mentions 'Telstra report nuisance phone calls', suggesting a lure to direct users to malicious or spam content. The ML classifier strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://wildchild.dance/uploads/1/3/0/3/130324137/130324137.html#telstra+report+nuisance+phone+calls
    • http://aandasports.photography/uploads/1/3/0/4/130435499/taxavirabada.pdf
    • http://rtimsartteacher.com/uploads/1/3/0/7/130739626/wuzix_fepumoromizi.pdf
    • http://globalvenue.org/uploads/1/3/1/3/131398131/kenenukojafik-tixev-wezurisa.pdf
    • http://zahntechnik-ruhrgebiet.de/uploads/1/3/0/7/130739539/fezorizodupisape.pdf
    • http://74-123-78-154.mgwnet.com/uploads/1/3/0/4/130491181/zezowokoxu.pdf
    • http://patriotcontractingcorp.com/uploads/1/3/0/7/130739173/5738224.pdf
    • http://selfobsessed.shop/uploads/1/3/1/0/131070027/setokaniwulexupeda.pdf
    • http://beautykonstanz.com/uploads/1/3/0/6/130604196/nuwixifagidexapip.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_off00005d0b.bin
704a639494cfff279f0301d97ca2d8d6de4f39c839e2a8f868063c003e798e48		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5D0B 8016 bytes

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