Malicious PDF — malware analysis report

Static analysis result for SHA-256 4238afade9ad3c5b…

MALICIOUS

PDF

34.3 KB Created: 2020-05-29 06:20:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e48ba93ff88ded73d2a45be20c8ef052 SHA-1: d1129ca4aeb1578f65d3d91628ee16da2802426f SHA-256: 4238afade9ad3c5b6f94b7c0b1704c86d417b5d0e7bcd1ebac8dd9fe5e16267a
96 Risk Score

Malware Insights

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

The PDF contains a large number of external links to various domains, a technique often used for SEO poisoning or to redirect users to malicious content. The heuristic 'PDF_SEO_LINK_FARM' specifically identifies this pattern, indicating a likely attempt to manipulate search engine results or distribute malware through a network of linked documents. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://secure-pof.com/uploads/1/3/0/6/130604505/130604505.html#dormida+en+calzones+transparentes
    • http://sbcam.net/uploads/1/3/0/4/130489563/sekivedagubu.pdf
    • http://wardscornercottage.com/uploads/1/3/0/7/130776585/bfd6739d.pdf
    • http://carllcleaningservice.com/uploads/1/3/0/7/130740256/tuwamabe_lijujema_kidagonovixaw.pdf
    • http://sweetbakesbybeb.com/uploads/1/3/0/7/130740324/a151360b.pdf
    • http://tubeshoes.com/uploads/1/3/0/5/130551475/ae3de.pdf
    • http://thatanimalgroup.org/uploads/1/3/0/7/130738949/40407e0.pdf
    • http://palmsopenproject.com/uploads/1/3/0/5/130589391/fumitovukosa.pdf
    • http://joycemarshluxuryhomes.com/uploads/1/3/0/5/130551049/8404568.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_off00005b10.bin
85260c0744b7d07a21f80b4f2107d74ab83dbc6616a5da799bb024769121d0b1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5B10 10500 bytes

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