Malicious PDF — malware analysis report

Static analysis result for SHA-256 640a04251d691522…

MALICIOUS

PDF

36.9 KB Created: 2020-04-01 12:40:35 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 131cf9804fcf699616eda8fdbb4f2d7c SHA-1: 7fdb9a62aba8dccf5a605ddae779a5fbd067a7de SHA-256: 640a04251d6915226001c23e9a62ee4d32f09c84f4f128737fa15dc6f697cd42
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file exhibits characteristics of a link farm or SEO spam, containing numerous external links to other PDF documents hosted on various domains. The ML classifier strongly flagged this PDF as malicious, and the presence of a large number of external links suggests an attempt to manipulate search engine results or distribute malicious content. No scripts were extracted, but the sheer volume of outbound links is highly suspicious.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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://riversidecountyhistory.org/uploads/1/3/0/4/130483514/130483514.html#divine+mercy+chaplet+guitar+sheet+music
    • http://especialidadyservicios.com/uploads/1/3/0/5/130588357/6212925.pdf
    • http://bstuckpoodles4u.com/uploads/1/3/1/4/131406892/5082601.pdf
    • http://spcprinting.com/uploads/1/3/0/4/130476024/lifutotawubogafetowa.pdf
    • http://savoreldorado.com/uploads/1/3/0/8/130873906/gisatos.pdf
    • http://stonegatebernedoodles.com/uploads/1/3/0/7/130739887/berosujuvib-tusebonole-zupebevelefutuz.pdf
    • http://odempsey.net/uploads/1/3/0/5/130589227/351874.pdf
    • http://minuku.com/uploads/1/3/0/3/130379503/8937323.pdf
    • http://tigerlilypa.com/uploads/1/3/0/2/130271114/6000166.pdf
    • http://mynxbeautybar.ca/uploads/1/3/0/7/130740232/9452202.pdf
    • http://wepitchin.com/uploads/1/3/1/4/131437725/a56523a.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_off00006592.bin
c2b9670bba8cd623012bc359acae6d110ab467ca820f9c3bc141a2530183f556		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6592 9076 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.