Malicious PDF — malware analysis report

Static analysis result for SHA-256 da1298448d11c72d…

MALICIOUS

PDF

43.0 KB Created: 2020-04-12 07:13:17 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: db430c20610d5bf9d3411a41d9934e05 SHA-1: 30773f7b27500ac328b2b1620c74473bb3f7eedf SHA-256: da1298448d11c72d4e9cd26fd7ebeaf3d56c183d645b64e59247d0c591475dd3
94 Risk Score

Malware Insights

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

The PDF contains numerous external links, many of which point to suspicious domains and appear to be part of a link farm designed to distribute malware. The ML classifier strongly indicated maliciousness. The document body, though heavily obfuscated, contains a URL that matches one of the extracted external links, reinforcing the lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://teshuvah.international/uploads/1/3/0/2/130270907/130270907.html#my+brilliant+friend+book+review
    • http://boshuster.com/uploads/1/3/1/3/131383934/reteli.pdf
    • http://www.thecambridgescotcheggcompany.co.uk/uploads/1/3/1/4/131406281/zigalelelotumakiz.pdf
    • http://vancouverfreediving.net/uploads/1/3/0/6/130621686/2820516.pdf
    • http://gymcoachmichelle.com/uploads/1/3/0/7/130775784/eac68a8d9.pdf
    • http://queenseasyautocredit.com/uploads/1/3/1/0/131071183/zabuwelav.pdf
    • http://highlandparkbaptistchurch.net/uploads/1/3/0/7/130740224/0b26ab7.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_off00008312.bin
a5d5c989447eb1029260ab2a070473458a2e72ea7545a54784fa9483b385afd3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8312 7600 bytes

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