Malicious PDF — malware analysis report

Static analysis result for SHA-256 1fbe8a6dba171bbd…

MALICIOUS

PDF

45.9 KB Created: 2020-04-01 12:10:15 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: c8c6bd5b7b0749eb77a4f41e7ad3f7a8 SHA-1: 557603eb013d01fda2a37ad3fea52e5e56b4b430 SHA-256: 1fbe8a6dba171bbd53af24d7f90cb4678fad067d062e60b32167f34234e96936
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1598 Gather Victim Identity Information T1204.002 Malicious Link

The PDF file contains a large number of external links, many of which point to PDF documents with numeric slugs, indicative of SEO spam or a link farm. The document body, though partially corrupted, contains text related to 'ejercicios de ecuaciones' and mentions wkhtmltopdf, suggesting a lure for educational content. The ML classifier strongly flagged this PDF as malicious. The primary attack pattern involves redirecting users to a network of external sites, likely to host malicious content or for SEO manipulation.

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://angelwellness.net/uploads/1/3/0/5/130551653/130551653.html#ejercicios+de+ecuaciones+de+primer+y+segundo+grado+4+eso
    • http://accoladetechnoheights.com/uploads/1/3/0/2/130288924/b1c397a86.pdf
    • http://w3ministries.com/uploads/1/3/0/2/130288562/nelujuratesafi-jiresatazogu-xolidabefa-derixokeb.pdf
    • http://allidarrowvoices.com/uploads/1/3/0/6/130620868/32af5ec3419.pdf
    • http://packerforcamphill.com/uploads/1/3/0/6/130605152/saxus.pdf
    • http://globalgardenfarm.com/uploads/1/3/0/7/130739655/senavuzibejum.pdf
    • http://perfectionwindowcleaner.com/uploads/1/3/0/6/130605089/tomuxumofod-wusak-dudoza.pdf
    • http://johnsonshvacservicerepair.org/uploads/1/3/0/6/130620290/4762954.pdf
    • http://tomsettplumbing.com/uploads/1/3/0/4/130483860/71dbe89.pdf
    • http://rosepedalclothing.store/uploads/1/3/0/6/130622080/saveba.pdf
    • http://conseildecog04.fr/uploads/1/3/0/2/130289241/9520693.pdf
    • http://typingduel.com/uploads/1/3/0/2/130272086/wobuten.pdf
    • http://klapipussi.fi/uploads/1/3/0/4/130476208/puzetuveg.pdf
    • http://premoldeadoshormigon.com/uploads/1/3/0/7/130738994/f6c4b8f3551e1e0.pdf
    • http://dynamicelectricllc.com/uploads/1/3/0/3/130313336/11dc751fb5da3c.pdf
    • http://nnoodl.com/uploads/1/3/0/4/130490338/vetim-xaketa-bonatop.pdf
    • http://grammasglasses.com/uploads/1/3/0/2/130272571/kevan.pdf
    • http://hoperestoreduk.com/uploads/1/3/0/7/130776272/536a1.pdf
    • http://tjpennington.com/uploads/1/3/1/3/131381363/6801052.pdf
    • http://whiteroseartstudio.com/uploads/1/3/0/7/130775275/3771510.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_off00008689.bin
fc5e33154c9f770b4883210a7b9273c0ccbbb70dce46de18fa759b2bf74ade3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8689 9192 bytes

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