Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a32e6c8bbb042b7…

MALICIOUS

PDF

44.1 KB Created: 2020-04-29 04:41:53 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 26f9999c4299eed124805332af2087a6 SHA-1: 2eeaebb2fb4bc9f977f8d93ab8dda611242fab08 SHA-256: 0a32e6c8bbb042b71b0eeb098afd049e815d16ccd4db10e618f31cd85544b577
96 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are structured as SEO link farms. The ML classifier strongly indicates maliciousness, and the presence of embedded URLs suggests an attempt to redirect the user to malicious content. The document body, though obfuscated, contains text related to an employment application, likely a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://ereksitahanlama.com/uploads/1/3/1/1/131163590/131163590.html#sample+employment+application+form+pdf
    • http://arsfabricandi.com/uploads/1/3/0/4/130483210/refozoziro.pdf
    • http://journeycommunications.net/uploads/1/3/1/3/131398010/lufike-gijoxugodet-fumero-zavezotekesexid.pdf
    • http://marriedhousingrexburg.com/uploads/1/3/0/6/130620924/todolizeradatofof.pdf
    • http://thefatetribeshop.com/uploads/1/3/0/5/130550749/7170345.pdf
    • http://bluecoyotesportsbar.com/uploads/1/3/1/1/131163920/9de745881.pdf
    • http://clefconstruction.com/uploads/1/3/0/8/130813885/4c907fcf56c8ba4.pdf
    • http://domainesaintmichel-provence.com/uploads/1/3/1/4/131438092/pesagadakut_sixogolinanajij.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_off000084c6.bin
0c02ccf331ed96ec00a1d22017d726b3cfb59f6a9c6f5404310a83fcc6950e16		 pdf-font-stream PDF embedded font (sfnt) at offset 0x84C6 7756 bytes

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