Malicious PDF — malware analysis report

Static analysis result for SHA-256 43b126cd348a4fca…

MALICIOUS

PDF

34.5 KB Created: 2020-04-11 05:17:34 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: d005e855c09c0411d99b66eaff81b335 SHA-1: a29b73e6c0c78253aff40bbdcbc4d3ce5a77f963 SHA-256: 43b126cd348a4fca5fdb76ff27db328d46968157aa005a39aa0a0b2de9e9231b
94 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to other PDF files on various domains, indicating a link farm or SEO manipulation tactic. The ML classifier strongly flagged this PDF as malicious, and the presence of numerous external URIs suggests an attempt to redirect users to potentially harmful content or to distribute further malware. No scripts were extracted, limiting the analysis of direct execution capabilities.

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://riversidecountyhistory.org/uploads/1/3/0/9/130969813/130969813.html#sistemas+de+fuerzas+coplanares
    • http://icapturephotography.org/uploads/1/3/0/4/130492441/pojoseva.pdf
    • http://atelier-tat-ort.de/uploads/1/3/0/4/130483759/5518891.pdf
    • http://swim-coaching.com/uploads/1/3/0/8/130874039/1712418.pdf
    • http://shessoextra.com/uploads/1/3/1/4/131407445/bepusedifo-moguwaguvizowa-xiranexifu-xixutegilalew.pdf
    • http://theoregonbookkeeper.com/uploads/1/3/0/6/130604382/benimewir.pdf
    • http://room2dream.net/uploads/1/3/0/4/130488295/0f4ce9907d.pdf
    • http://dbworksinteriorexteriorremodel.com/uploads/1/3/0/6/130621490/fezutoz.pdf
    • http://transitionsvapor.com/uploads/1/3/0/8/130814935/8553644.pdf
    • http://rachelehirsch.com/uploads/1/3/0/5/130550836/e78a034f2.pdf
    • http://shessoextra.com/uploads/1/3/1/4/131407445/bepusedifo-moguwaguvizowa-xiranexifu-xixutegilalew
    • 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_off00005eb6.bin
6afd6218b4186a6b3fa3c985144f6b5747d81442c48d1804f0e066994f21f29e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5EB6 8196 bytes

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