Malicious PDF — malware analysis report

Static analysis result for SHA-256 cfce875dbb7a5984…

MALICIOUS

PDF

37.6 KB Created: 2020-04-08 21:29:14 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: f3f4bda6530dbceaa879d4ce96c22cfc SHA-1: 7bd58a150967c3b60715274e9f6a110aacfc75a1 SHA-256: cfce875dbb7a5984b43e1d431be3e2320a7c4c3a81cadfc9fb1497eaaea6910a
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.001 PowerShell

The PDF document contains a large number of external links, many of which are SEO-optimized and point to other PDF files. This behavior is indicative of a link farm or redirection scheme. The ML classifier strongly flagged this PDF as malicious. No scripts were extracted, but the presence of numerous external URLs suggests a delivery mechanism for further malicious content or phishing attempts.

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://bodyworkbybarb.com/uploads/1/3/0/7/130740010/130740010.html#avengers+endgame+credit+scenes
    • http://technology-ops.com/uploads/1/3/0/6/130620282/9509882.pdf
    • http://southernautomationandsafety.com/uploads/1/3/0/8/130873737/kipatatukep-jurerojopub-tobiz-sajereso.pdf
    • http://swcreations.org/uploads/1/3/0/7/130739240/depavifo_netunoxoporu_wesutegaf_sorajetotubuxi.pdf
    • http://family1stpropertiesllc.org/uploads/1/3/0/5/130589444/4113983.pdf
    • http://drsbernerandburesh.com/uploads/1/3/0/6/130640095/3896eb88e9173f3.pdf
    • http://childrensanimalrescue.com/uploads/1/3/0/7/130775169/2646456.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_off00006abd.bin
e243b25985ba53df83d9a768b0ca9ef4bee11babc8517212a43d32810eaaee9c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6ABD 8136 bytes

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