Malicious PDF — malware analysis report

Static analysis result for SHA-256 42689cea056a73cd…

MALICIOUS

PDF

33.5 KB Created: 2020-04-21 11:02:03 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: a6fdc88e94b114ac2f6f66283313fff4 SHA-1: 834f103eb720145cba4bc5d869966a9c35d3f8b8 SHA-256: 42689cea056a73cd11830a4bced2643ba73664e0caab9eb5e965e57d7042c704
92 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious File

The PDF file contains numerous external links, identified by the PDF_SEO_LINK_FARM heuristic, pointing to various domains. The document body, though partially corrupted, suggests a lure related to an 'IELTS academic reading test answer sheet'. The ML_NYX_PDF_MALICIOUS heuristic strongly indicates malicious intent. The primary attack pattern involves redirecting users to these external sites, likely to host further malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

Heuristics 3

  • 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
  • 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://bronxcbt.com/uploads/1/3/0/6/130639087/130639087.html#ielts+academic+reading+test+answer+sheet
    • http://johnraw.com/uploads/1/3/1/3/131379792/579148.pdf
    • http://topofthewine.shop/uploads/1/3/0/8/130814644/5dab3f2.pdf
    • http://stmk1onlinelearning.com/uploads/1/3/0/4/130483911/86a35bed.pdf
    • http://nanoluge.com/uploads/1/3/0/5/130542934/5833707.pdf
    • http://alcottcove.com/uploads/1/3/0/6/130639061/545835bce5d5139.pdf
    • http://riverplus-network.com/uploads/1/3/0/7/130739253/fewimudezofewon.pdf
    • http://homesofhopenepal.com/uploads/1/3/1/4/131405948/folovebarij.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_off00005970.bin
ad20223b4da9df1ac3728deb6dcd5f760205f95b618930a8368c3e8e908e01c0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5970 8028 bytes

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