Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4e8371c9ee60ea4…

MALICIOUS

PDF

46.0 KB Created: 2020-04-11 08:04:41 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 27cb6af5a64f167d1c55e6e9f3122781 SHA-1: c3aaf1fceb30f1ceacfe7ec73a0c06785b2ebb77 SHA-256: d4e8371c9ee60ea430f55edd8aaea4a543cfa8ce7f9a2561d523054e222d5317
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1566.002 Spearphishing Link T1204.002 Malicious Link

The PDF file contains a large number of external links, many of which point to similarly structured URLs on different domains. This behavior is indicative of a link farm or a phishing campaign designed to direct users to malicious content. The ML classifier strongly supports the malicious verdict, and the embedded URLs are the primary indicators of compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://qualitycareafh.com/uploads/1/3/0/2/130270934/130270934.html#read+this+present+darkness+online+free
    • http://wesbonnellperform.com/uploads/1/3/0/2/130289166/boposat.pdf
    • http://pcismusic.org/uploads/1/3/0/7/130776063/fizoxofowajifele.pdf
    • http://wewininc.org/uploads/1/3/0/3/130313306/f251f5b60fad673.pdf
    • http://cassandraneuhauspsyd.com/uploads/1/3/0/2/130273626/948f13c6d6d0.pdf
    • http://entreprenorth.org/uploads/1/3/0/7/130739132/9fed529.pdf
    • http://optimusbusiness.net/uploads/1/3/1/1/131163658/lokepajijinoz.pdf
    • http://officermnop.com/uploads/1/3/0/6/130620282/nonarazesuwede_voxajaxoruvep_nuzari.pdf
    • http://beltcreekproperties.com/uploads/1/3/1/4/131437427/fokofovijuw.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_off00008c12.bin
1d57207fef5362721af09ece9d3b958e3e6765ee498b85edb47cf32c15340867		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8C12 8388 bytes

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