Malicious PDF — malware analysis report

Static analysis result for SHA-256 6cc8162bc3fe6033…

MALICIOUS

PDF

41.2 KB Created: 2020-03-29 22:46:20 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 3bdd481bbe7a13cb09e1581c8160bafa SHA-1: 0303259d673f39a9c914d89fc41d469df3f3ac65 SHA-256: 6cc8162bc3fe603358250f9fe368df83199f87d4a0227e6cdd8461e01b71b6c3
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of external links, many of which point to PDF files with numeric slugs, suggesting a link farm or SEO abuse tactic. One of the embedded URLs, 'http://cityonloc.com/uploads/1/3/0/5/130552106/130552106.html#kodak+scanmate+i1120+windows+10', is presented as document content, likely a lure to a malicious site. No scripts were extracted, but the PDF structure and numerous external links indicate a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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://cityonloc.com/uploads/1/3/0/5/130552106/130552106.html#kodak+scanmate+i1120+windows+10
    • http://midnight-owl-creations.com/uploads/1/3/0/2/130288514/2839913.pdf
    • http://tiffin-fresheveryday.com/uploads/1/3/0/7/130775928/bdfafbd.pdf
    • http://bohemianattic.com/uploads/1/3/0/7/130739538/2416307.pdf
    • http://thebasicelementskinesiology.com/uploads/1/3/0/2/130289214/majulajij.pdf
    • http://cgpservicesfinanciers.ca/uploads/1/3/0/9/130968933/jajum.pdf
    • http://sweetnlowdachs.com/uploads/1/3/0/6/130621908/dc01b8d3d9e8.pdf
    • http://joshuamemory.com/uploads/1/3/0/7/130739224/4831858.pdf
    • http://kwspecialeducationhelp.com/uploads/1/3/0/6/130621059/xekirejiko_nuwegadisef_lutexafad_zutos.pdf
    • http://not-aims.com/uploads/1/3/0/5/130545199/8274388.pdf
    • http://risingorg.com/uploads/1/3/1/1/131164122/f236b1f4eaec.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006bd2.bin
02598d4f59550aa2c6fc78f396521454d89cdc238c154b085a29d73185d468f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6BD2 8908 bytes
font_01_sfnt_off00008df5.bin
cf2338b7895a3a873add1db7dfb411390262a2a3d24e5b3dccff59843624ea97		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8DF5 2704 bytes

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