Malicious PDF — malware analysis report

Static analysis result for SHA-256 34ab08e48be90969…

MALICIOUS

PDF

33.1 KB Created: 2020-05-16 05:01:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2a2a8c202ee6ada0d0a89490b52744f5 SHA-1: e6c0b611abfa732f93c9839ed2ba2d0978a1b04a SHA-256: 34ab08e48be90969c5c2782331c58e5c4b471211a8765ed1e1f042b974c1549c
96 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded external links, identified by the PDF_SEO_LINK_FARM heuristic. These links point to various PDF files hosted on different domains, suggesting a link farm or SEO manipulation tactic. The ML classifier also strongly indicated maliciousness. No scripts were extracted, and the document body was heavily obfuscated, but the primary function appears to be directing users to a network of external resources.

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://blueconstruction.net/uploads/1/3/0/4/130435922/130435922.html#idle+champions+cramped+quarters+formation
    • http://elitehoopstars.com/uploads/1/3/0/8/130874139/4530382.pdf
    • http://appsmoredetailscureapss.com/uploads/1/3/0/5/130588506/sibetaluja.pdf
    • http://ajumma360.com/uploads/1/3/0/2/130289224/jurejexedujava_sutuwofoboz_wevewerax.pdf
    • http://richterconstruction.net/uploads/1/3/0/4/130435925/0b3baf1bc0cd.pdf
    • http://gilbertsonexpertwitness.com/uploads/1/3/0/4/130435850/fimexifaz-kagadewipuno-renedepa.pdf
    • http://rakagrosirbaju.com/uploads/1/3/0/5/130540026/ranizijomolikifi.pdf
    • http://mclconsortium.org/uploads/1/3/0/7/130739978/85a0feac3.pdf
    • http://jrassociates.org/uploads/1/3/0/4/130476525/fokofepule.pdf
    • http://kevinkellyrealty.com/uploads/1/3/0/9/130969404/nugexu.pdf
    • http://empoweredyouthprograms.com/uploads/1/3/1/6/131637839/wimemosutepewuj_tugodalalojux.pdf
    • http://thehikinghousewife.com/uploads/1/3/0/3/130324241/kivofewonewed.pdf
    • http://lushlife.shop/uploads/1/3/1/8/131857241/dudumidefe-rinitojalabe.pdf
    • http://krissycandicehealing.com/uploads/1/3/0/5/130588833/luvekofivufapi-xojobuvot.pdf
    • http://pigenvy.com/uploads/1/3/0/6/130621771/3d444ba6b87.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_off000054a8.bin
de9f3c12743b9731b1c36248f63f6d69108800f61ae313830a21b43c1b5d6f28		 pdf-font-stream PDF embedded font (sfnt) at offset 0x54A8 10632 bytes

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