Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b8e487f46778765…

MALICIOUS

PDF

57.7 KB Created: 2020-05-05 04:58:54 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 2198c5f34a791a31423754c3124abe6c SHA-1: 3da307f5b6e8fef85068cfba56fa154284ecb75a SHA-256: 7b8e487f46778765634aef5d57e5802ca9adc10228f9e637b62fea89dcd2a4b9
96 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which point to domains that appear to be part of a link farm. The ML classifier strongly indicated maliciousness. The primary attack pattern involves redirecting users to potentially malicious or spam-laden websites through these embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9806

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://theweightlosscoach.net/uploads/1/3/0/4/130483980/130483980.html#magnetic+resonance+guided+focused+ultrasound+parkinson
    • http://devinhyltonphotography.com/uploads/1/3/1/3/131383553/3793789.pdf
    • http://phalanxhomeinspections.com/uploads/1/3/1/4/131453283/borafarevomaf.pdf
    • http://northwalestreeservices.com/uploads/1/3/0/7/130776275/gufige-fepan.pdf
    • http://nicoletteheather.com/uploads/1/3/0/4/130476456/878b1ab490.pdf
    • http://medihealthconsulting.com/uploads/1/3/0/6/130603744/59399e06d2cf0.pdf
    • http://synergycsllc.com/uploads/1/3/1/4/131438308/7d22d850d0a09c.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • 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_off0000b68a.bin
0dfe75de66b4a8fb167d80f5413c43df60a53be65a7c61675765ba9b6cdcf4f5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB68A 11156 bytes

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