Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f92020df1eb3717…

MALICIOUS

PDF

74.3 KB Created: 2020-04-10 22:32:01 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: ab1bea39fe33dd1b1e7a6aa21b122066 SHA-1: 874465d1c3d981ed168b4218cb7ce9fc4b378a04 SHA-256: 0f92020df1eb3717867bd487978126b0b3237398e99ed5e0943e4a24fc406b29
96 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier as malicious and contains a large number of external links, many of which point to similarly structured URLs. This suggests a link farm or a distribution point for further malicious content. No scripts were extracted, but the sheer volume of embedded links indicates a high likelihood of user interaction leading to a compromised system.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9073

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://host161.carmichaelnl.com/uploads/1/3/1/0/131069806/131069806.html#minimal+pairs+list+pdf
    • http://centrobeautyessence.com/uploads/1/3/0/7/130740498/ca008c83.pdf
    • http://safetymafia.net/uploads/1/3/0/8/130813364/vuxisemezafivojat.pdf
    • http://walkingtourstoronto.com/uploads/1/3/0/6/130604416/7962448a8225.pdf
    • http://fayettevillearhousecleaning.com/uploads/1/3/0/6/130639514/08e72086c5.pdf
    • http://gocustomstamps.com/uploads/1/3/0/4/130435619/xerowadumog_pulakonawuv.pdf
    • http://maddgijoe.com/uploads/1/3/1/3/131380297/9895277.pdf
    • http://gardenviewcreations.com/uploads/1/3/0/2/130273626/e14fd5a552.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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/
    • https://fedoraproject.org/wiki/Licensing/LiberationFontLicense
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000da39.bin
bab9af0501ec154a7baeebdb66d21f5622d3bc14af5ead768eae157427bdbdba		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDA39 8080 bytes
font_01_sfnt_off0000f96e.bin
11eff0542ee112a7a4f3d5fa86892f13f7f7c80edb17354215cea33bb7714487		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF96E 2768 bytes
font_02_sfnt_off00010338.bin
113b20993bb22af9baf9cb28aee1bfd1f06febf032953c1b224f64dda219ace9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10338 17412 bytes

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