Malicious PDF — malware analysis report

Static analysis result for SHA-256 964d671f70412fb7…

MALICIOUS

PDF

31.8 KB Created: 2020-06-09 09:50:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f4934b1d9702e9b279872fe0846d1182 SHA-1: 5419b0ec7696c7a48a37ae3d1cbf2dcd5b1bbf9a SHA-256: 964d671f70412fb70dc891a860676cbc46aa9e8e1d83cc6044e58bd63ab88008
94 Risk Score

Malware Insights

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

The PDF document was flagged by an ML classifier as malicious. It contains a large number of external links, many pointing to domains that appear to be part of a link farm. The document body contains fragments of text related to a 'baby cache heritage model 3500 conversion kit' and also includes several URLs, suggesting a lure to external content. The primary attack pattern observed is the creation of a link farm within the PDF to direct users to potentially malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://portsmouthboilerrepair.com/uploads/1/3/0/7/130739206/130739206.html#baby+cache+heritage+model+3500+conversion+kit
    • http://wheelandwedge.com/uploads/1/3/1/6/131607019/tujifufebezogal-sarelobizub-ralatiwa-fivakifan.pdf
    • http://malcolmspringcreek.com/uploads/1/3/0/6/130604973/jotopetokadigisara.pdf
    • http://jayestarkes.com/uploads/1/3/0/7/130738572/9868152.pdf
    • http://laurendavis-studio.net/uploads/1/3/0/5/130541656/duvetakijulirif.pdf
    • http://myetinfo.com/uploads/1/3/0/7/130739026/1625169.pdf
    • http://rcdesigns-online.net/uploads/1/3/1/4/131407890/wubagixij-vakazigaj-kabemesovixifi.pdf
    • https://gelumirilaju.files.wordpress.com/2020/06/larutowozebo.pdf
    • https://zawonaj.files.wordpress.com/2020/06/luvuremuzo.pdf
    • https://segokowiw.files.wordpress.com/2020/06/92240550390.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_off00005164.bin
949f2e7bf501be48ff0416a680ef9d46eac1977fa23e713195f37987506e40f1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5164 10204 bytes

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