Malicious PDF — malware analysis report

Static analysis result for SHA-256 f32401cd41d6170d…

MALICIOUS

PDF

34.6 KB Created: 2020-06-10 06:08:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e1a49986d7db93f345ec1cd0bf06b88d SHA-1: b95add57c8450b0807d965df1530fef1915af1a5 SHA-256: f32401cd41d6170d4eec36f76e9a02e3bcbe394a9fb81de78eaa536736fc4717
96 Risk Score

Malware Insights

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

The PDF file contains a significant number of external links, as indicated by the PDF_SEO_LINK_FARM heuristic. The document body itself is largely unreadable but contains some of the URLs. The primary purpose appears to be to act as a link farm, directing users to numerous other PDF files hosted across various domains. This technique is often used for SEO manipulation or to distribute further malicious content.

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://adhere2care.net/uploads/1/3/0/5/130541064/130541064.html#cinayet+alfabesi+%25C3%25B6zeti
    • http://gcreia.com/uploads/1/3/0/6/130604338/xumow.pdf
    • http://agfxinvestments.com/uploads/1/3/0/7/130739445/8090595.pdf
    • http://toastmasters.tmd55.org/uploads/1/3/0/6/130604446/sajit.pdf
    • http://kkperformance.net/uploads/1/3/1/1/131163638/6349184.pdf
    • http://bentleywedding.org/uploads/1/3/0/7/130774966/8964241.pdf
    • https://mebovuvej.files.wordpress.com/2020/06/rekuvelajulusufuramesu.pdf
    • https://niwujaregoz.files.wordpress.com/2020/06/19003024062.pdf
    • https://megixol164542015.files.wordpress.com/2020/06/nuzaxikakabubek.pdf
    • https://razekusokil.files.wordpress.com/2020/06/21546545682.pdf
    • https://jevodoniweku954148245.files.wordpress.com/2020/06/nevesuzodugonozugab.pdf
    • https://dipenafuvepe538297139.files.wordpress.com/2020/06/90208157836.pdf
    • https://xevubimeroz.files.wordpress.com/2020/06/pukizodekokoxazodo.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_off00005bb0.bin
c75d216640ab9710cd609977d50c31339a4b66605ed2d8e3321bb34362c7debc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5BB0 10972 bytes

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