Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd2baaab68a18d87…

MALICIOUS

PDF

39.4 KB Created: 2020-04-04 07:32:54 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: c74700a57eb4820e80bc8a0667092ed8 SHA-1: 0729b85695f1bd9f8e8d0b509dca74171418defb SHA-256: dd2baaab68a18d872b443cf032881820b19b9013f1c8c363874a36bcd7ca5688
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a large number of external links, a technique often used for SEO manipulation or to distribute further malicious content. The ML classifier strongly indicated maliciousness. The embedded URLs point to various domains, suggesting a link farm or a distribution network for potentially harmful files.

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://vintagehomedecoroldsaybrook.com/uploads/1/3/0/7/130739833/130739833.html#man+of+sorrows+lyrics+ellie+holcomb
    • http://sqlserverbox.com/uploads/1/3/1/4/131453018/92a81e08b00df44.pdf
    • http://topchoiceinstallations.com/uploads/1/3/0/8/130814715/kikobotufagakebiviwe.pdf
    • http://mickeyglitter.com/uploads/1/3/0/4/130479044/vodoxozarejumil.pdf
    • http://inlakeshunlugardeluz.com/uploads/1/3/0/6/130639453/6764873.pdf
    • http://lightofhopecandleco.com/uploads/1/3/0/6/130603979/jibunepiluti_zosekagum_kovukifigigukop_vowotajava.pdf
    • http://miller-hiscock.com/uploads/1/3/0/3/130323417/9071094.pdf
    • http://abideyourabode.com/uploads/1/3/0/3/130313132/9577187.pdf
    • http://potcm.org/uploads/1/3/0/5/130589195/gudavavi_kunop_doturopeta_tomewa.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_off00007109.bin
5b410ff910956327d4d477c4963ef6efcc6851fd9bf0eba76ee200ba7f4d0910		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7109 8304 bytes

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