Malicious PDF — malware analysis report

Static analysis result for SHA-256 3430e8bfe722356c…

MALICIOUS

PDF

37.8 KB Created: 2020-04-08 01:47:28 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: caf4eeb3b96b84a15fe877b3b9e6fa03 SHA-1: e9e0ed41dc5e8c8a9edcac6959c4e86462701ea5 SHA-256: 3430e8bfe722356c2d1dc10247114bdba1939aa32d9ccc19a6519dc5aaf6162b
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external links, many of which point to other PDF files hosted on various domains. This behavior is indicative of a link farm or SEO manipulation tactic, potentially used to distribute malicious content or improve search engine rankings for malicious sites. The ML classifier also strongly flagged this PDF as malicious.

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://miletocarpentryptyltd.com/uploads/1/3/0/8/130813554/130813554.html#pokemon+yellow+official+strategy+gui
    • http://businessclaimingservice.com/uploads/1/3/1/4/131437737/guxasuwip_madevolupepuma.pdf
    • http://rpgconsulting.co/uploads/1/3/0/6/130604525/1954523.pdf
    • http://ithinkevents.com/uploads/1/3/0/5/130589299/4785349.pdf
    • http://joanne-scott-csol599.com/uploads/1/3/0/8/130874517/nagedufuxega-fegeso.pdf
    • http://chicabeauty.net/uploads/1/3/0/7/130776201/8771288.pdf
    • http://deryn.net/uploads/1/3/0/9/130968996/toremam_soledo.pdf
    • http://persucarhipa.net/uploads/1/3/0/7/130776632/tefuwulu_dagupuzed_bekosokebirit.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_off00006a92.bin
944be0c8509412a3df5910da7a57cffb9b80d17dfc729910e24bd8fe6ac47c33		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6A92 8632 bytes

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