Malicious PDF — malware analysis report

Static analysis result for SHA-256 98e16d88237c309c…

MALICIOUS

PDF

32.6 KB Created: 2020-05-14 23:18:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0e983ea649facfd350ec2f28f7ec9d11 SHA-1: acf73d8a3f3051fbd07567ee5006cd9b22eb06d6 SHA-256: 98e16d88237c309c1c0022be283a705525703ffd5a98d6a329a9630e07c29a49
94 Risk Score

Malware Insights

MITRE ATT&CK
T1598 Gather Victim Identity Information T1204 Malicious Link

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, pointing to various domains. The ML classifier also strongly indicated maliciousness. The document body contains a mix of seemingly random text and URLs, suggesting a content-generation or SEO-spamming tactic. The primary intent appears to be directing users to a network of linked PDF files, potentially for distributing malware or engaging in click fraud.

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://somersetfoodtrail.org/uploads/1/3/0/8/130814439/130814439.html#bezubaan+ishq+movie++mp4+hd
    • http://millenniuminternational.biz/uploads/1/3/1/4/131437160/bizuren-jojugopajewis.pdf
    • http://leslie-marshall.com/uploads/1/3/0/7/130740612/rusukevako.pdf
    • http://dogfriendlyrentalsonsanibel.com/uploads/1/3/0/6/130622093/6910210.pdf
    • http://tronbitcoins.com/uploads/1/3/0/6/130604417/1285485.pdf
    • http://blackbindi.xyz/uploads/1/3/0/6/130621167/rotirenuxevinaz.pdf
    • http://vikingwarm.com/uploads/1/3/0/8/130814353/sufijizijot.pdf
    • http://emmachristopherlakesassociation.org/uploads/1/3/0/2/130272940/2219734.pdf
    • http://istanbulcontemporary.org/uploads/1/3/1/6/131606874/be43a4e732f75.pdf
    • http://sirnoble.net/uploads/1/3/1/4/131407299/tasigidujip.pdf
    • http://plomerocortez.site/uploads/1/3/0/3/130313224/37450f27c.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_off000053b9.bin
7ec9a14ab2bd1e1ad1230189bb23b5e7a13df2ec6f07366d2d92ff1436054c95		 pdf-font-stream PDF embedded font (sfnt) at offset 0x53B9 10492 bytes

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