Malicious PDF — malware analysis report

Static analysis result for SHA-256 5fc91e99b49b41cb…

MALICIOUS

PDF

31.4 KB Created: 2020-05-17 14:14:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a3c0dbfe50ecc423d5b74946e5fe1d77 SHA-1: 5ff8cd1ff69e2fa9011c9024838417ac9ffc6976 SHA-256: 5fc91e99b49b41cb71b5f87a91b2f64058a5267e0264387ba87e531d8ce8e5f9
96 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or SEO spam campaign. The embedded document body text also contains URLs, further supporting this. While no scripts were explicitly extracted, the nature of the PDF and the numerous external links indicate a likely attempt to redirect users to potentially malicious websites or to engage in SEO manipulation.

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://sherlocktravel.org/uploads/1/3/0/3/130323594/130323594.html#bodyguard+malayalam+movie+songs++maango
    • http://throwstix.com/uploads/1/3/0/5/130547576/fc4a7b4.pdf
    • http://moleculeminions.com/uploads/1/3/0/2/130271185/5eb507644009a.pdf
    • http://witneycollectables.com/uploads/1/3/1/8/131856531/rosivonamam-bodisafax-pusujafefad.pdf
    • http://intensifyyoursport.com/uploads/1/3/1/3/131379379/a78a6522789d97.pdf
    • http://storiesthatpersuade.com/uploads/1/3/0/5/130542770/watumexaxulukoz.pdf
    • http://furnituresunderland.com/uploads/1/3/0/8/130814342/6870498.pdf
    • http://jadedbikini.com/uploads/1/3/0/5/130543064/gujifefuzo.pdf
    • http://narcanna.org/uploads/1/3/0/6/130604574/figaju_sevokepaku.pdf
    • http://arianneortiz.com/uploads/1/3/0/3/130313314/jowujepilakijodezo.pdf
    • http://solarscrappers.com/uploads/1/3/0/2/130289441/323eb9e8a7.pdf
    • http://ceciliabramhall.com/uploads/1/3/0/6/130639791/rasonuwosebuvi_xagagaxuxizo_tedof_rijemox.pdf
    • http://elitehoopstars.com/uploads/1/3/0/8/130874139/4530382.pdf
    • http://rwpdivephotography.com/uploads/1/3/0/3/130313190/6572114.pdf
    • http://eatatvivianscafe.com/uploads/1/3/0/7/130738845/3481399.pdf
    • http://ok-lendava.si/uploads/1/3/0/5/130540286/gegisavabisitof.pdf
    • http://opendoorstudentservices.com/uploads/1/3/1/6/131637271/zipiwega_vagemuteme_zaxusunuxupeli.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004ef1.bin
8917708e41fa4e8c3f6c20da5d2e0aec357e9a790834f60bbb2283b7fa8c7881
pdf-font-stream PDF embedded font (sfnt) at offset 0x4EF1 10292 bytes