Malicious PDF — malware analysis report

Static analysis result for SHA-256 15c2ca7e5e6d3cdc…

MALICIOUS

PDF

32.2 KB Created: 2020-04-06 11:01:42 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 0c3f67c6fb7dd120cfb7a4199bb29c5d SHA-1: 7d95cf3514c8913b61ef1697b1a1b467d1c9d837 SHA-256: 15c2ca7e5e6d3cdcddc8226ac36bec84c63d4c16f3f5f31869f1a522f0eb08fc
96 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by an ML classifier and exhibits characteristics of a link farm, containing numerous external URLs. The presence of a large number of links suggests an attempt to distribute malicious content or conduct phishing attacks by directing users to potentially compromised websites. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF designed for user redirection.

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://bloodblisterapparel.com/uploads/1/3/0/4/130491699/130491699.html#enfilado+de+dientes+poliplanos
    • http://ankabhi.org/uploads/1/3/1/1/131164476/kijiv-veduvokoxiliw-jatejigo.pdf
    • http://remnantsbarbersho.org/uploads/1/3/0/7/130775475/4419547.pdf
    • http://cblaseredgifts.com/uploads/1/3/0/4/130483279/1212594.pdf
    • http://elevenoaksmobilehomepark.com/uploads/1/3/0/7/130740251/3051220.pdf
    • http://daneschickedanz.com/uploads/1/3/1/4/131453907/kabilixedumodelizi.pdf
    • http://bandnautosalesllc.com/uploads/1/3/0/7/130776343/adb0e6b.pdf
    • http://fidicevalo.be/uploads/1/3/0/2/130272848/2ae2e7cb6.pdf
    • http://digital-kaleidoscope.com/uploads/1/3/0/7/130740316/22d021.pdf
    • http://anjaliseries.com/uploads/1/3/1/3/131382430/kisejib.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_off000056bc.bin
eb2fdab54e75801cd64fe16bc1df1e6ae7b23f52054a5fd8cf6303beb6eec75a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x56BC 7620 bytes

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