Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa8db825915e53e0…

MALICIOUS

PDF

31.1 KB Created: 2020-05-13 15:40:29 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 25c89f619776bb607da312fdba92103e SHA-1: cd1026cb3540ceb757bb6ce3fc78db9888fe6a69 SHA-256: aa8db825915e53e0d7aed15bbf45dca80317edd0a5019ce471a6181f5a2c4188
96 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, which is a common tactic for SEO poisoning or driving traffic to malicious sites. The ML classifier also strongly indicated maliciousness. The document body contains a mix of seemingly innocuous text and embedded URLs, suggesting a lure to external content. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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://inlandcbd.com/uploads/1/3/0/5/130588850/130588850.html#how+to+format+sd+card+mac+terminal
    • http://aplacetorest.org/uploads/1/3/0/2/130272606/9624937.pdf
    • http://psicosintese.pt/uploads/1/3/0/5/130551653/dolakafitinufenamin.pdf
    • http://wristgang.com/uploads/1/3/0/5/130543092/nojade.pdf
    • http://runciblespoonjam.com/uploads/1/3/1/4/131406149/pigotuxelaro-penizomu-saxubomipu-xakoja.pdf
    • http://distribuidoramaissaude.com/uploads/1/3/1/4/131483588/8456263.pdf
    • http://blueskyhvacservices.com/uploads/1/3/0/6/130639272/3b894.pdf
    • http://smithysluresonline.net/uploads/1/3/0/4/130483626/3846542.pdf
    • http://greendiver.org/uploads/1/3/1/6/131637555/vumezirodopodu_bawexud_tutoj_balisiva.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_off000050ae.bin
42c7ed691a18a0efb4c4f72556d56f9f5df6e5a47c8dfb4bba83c735157e0876		 pdf-font-stream PDF embedded font (sfnt) at offset 0x50AE 9620 bytes

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