Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c98321a6a5f8df2…

MALICIOUS

PDF

43.6 KB Created: 2020-05-16 21:55:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f7d6993440dd766960c293a82c08d8d7 SHA-1: 3fe0b723b96bb9d354a7d66bc524e9fb9d0f63e4 SHA-256: 8c98321a6a5f8df2f551ae8908179d1f5b5f546647b08dd6aa36776d5ff2ebca
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 to other PDF files hosted on various domains, indicative of a link farm or SEO manipulation tactic. The ML classifier strongly flagged this PDF as malicious. The presence of numerous external links suggests the document's primary purpose is to redirect users to potentially harmful content or to manipulate search engine rankings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://harrisonrappaport.com/uploads/1/3/0/6/130621317/130621317.html#bertrand+oligopoly+model+pdf
    • http://unblindedstore.com/uploads/1/3/1/4/131407683/7e233661626d13.pdf
    • http://historyedit.com/uploads/1/3/0/7/130739080/buluregaweworipar.pdf
    • http://hybridfit.org/uploads/1/3/0/2/130291416/2032797.pdf
    • http://minachoportfolio.com/uploads/1/3/1/3/131398358/vexaxuzow-gugopibewadala-lilelawudefi-pugebitow.pdf
    • http://mortensenportraits.com/uploads/1/3/1/4/131437037/moxadab_kewapesebawa_pakagufa_wijabafijud.pdf
    • http://rockhammerhdd.net/uploads/1/3/1/3/131379262/dac7f2b36d.pdf
    • http://wellnessembassydenard.org/uploads/1/3/1/3/131398104/wagukejesisupe-sozajis-vemomeruku.pdf
    • http://raiffaisencaptcha.com/uploads/1/3/0/3/130312919/217708ed86a.pdf
    • http://jaysresidence.com/uploads/1/3/0/5/130542692/pijojusajowawom-tivadomovu.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_off0000800f.bin
b9ef2e99425ccffd0de0d8c127b42561d0201c6a14c70dcdaaea58f4d411e7e9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x800F 10340 bytes

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