Malicious PDF — malware analysis report

Static analysis result for SHA-256 823df131a167adec…

MALICIOUS

PDF

33.6 KB Created: 2020-06-19 00:33:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5262cdd1e2589ac368c08153e21a8639 SHA-1: 9b6e086369ead2049fe51e2a65dabdd96e0c22e3 SHA-256: 823df131a167adec9bd3b32dbc8aa9ba17d0c75fc572b6dcf4ff94b1305997e7
96 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many of which point to PDF files with numeric slugs on various domains. This pattern is indicative of a link farm or a method to distribute malicious content disguised as search results or documents. The ML classifier strongly flagged this PDF as malicious, supporting the suspicious nature of the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://absystemsllcscam.com/uploads/1/3/0/4/130476141/130476141.html#minolta+xd+7+manual
    • http://hostmaster.somacare.ch/uploads/1/3/0/4/130493389/zojizelipesufo_xuzofoterelu.pdf
    • http://breatheeasygardens.com/uploads/1/3/0/7/130776801/bobavim.pdf
    • http://autodiscover.wordlyways.com/uploads/1/3/0/5/130550828/bitovot.pdf
    • http://patheticweasel.com/uploads/1/3/0/6/130620782/noxagifebeg_fuvib_zabab.pdf
    • http://dogdenmaitland.com/uploads/1/3/0/9/130969572/wagowigugexenebomexo.pdf
    • http://thomandkelswedding.com/uploads/1/3/1/4/131437845/subavobo_sisan_wiraruxigabela_lolosuvapane.pdf
    • http://ripplicious.com/uploads/1/3/0/6/130622013/0da08988691.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000496c.bin
bb70ab71d0a708f990793e748b205ff5bc759fcacced404f77aef8ffc2b6ac22		 pdf-font-stream PDF embedded font (sfnt) at offset 0x496C 4616 bytes
font_01_sfnt_off00005901.bin
e2929e5373b1ad7b2e86e5960f9905adfc6554d32be869292de9522c21e9c6f6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5901 9936 bytes

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