Malicious PDF — malware analysis report

Static analysis result for SHA-256 81317cf913dd31fd…

MALICIOUS

PDF

47.5 KB Created: 2020-04-16 03:21:54 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: c79d21786314e21731859ccccab62c9f SHA-1: f17aa1e1a4c45219f3c3a254b557ff4e0b43f1f3 SHA-256: 81317cf913dd31fd5ae472a89f4cef135886ef5c8b5fad6c306392baab876c35
136 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains numerous links to external PDF files, suggesting a link farm or a method to distribute further malicious content. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic indicates the document likely instructs the user to open a password-protected archive, a common tactic to bypass gateway security. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9959

Heuristics 5

  • 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.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://atasteofjamaicaandmore.com/uploads/1/3/0/8/130874045/130874045.html#register+form+template+wordpress
    • http://vonraesfeld.com/uploads/1/3/0/2/130289284/sabarivoribilopigaxa.pdf
    • http://rimabisharamd.com/uploads/1/3/0/4/130476010/efe2722dcc.pdf
    • http://extremeglamhair.com/uploads/1/3/0/5/130551089/wiroxenisu.pdf
    • http://avidandiyafinejewels.com/uploads/1/3/0/2/130272270/9688026.pdf
    • http://atoldelote.com/uploads/1/3/0/6/130639709/bokavovupigupa_pokasosus_wadufon_nibawixavukaw.pdf
    • http://bag2thebone.com/uploads/1/3/0/7/130739128/wikixibufuxa_sepeto_nodadi_sufiwu.pdf
    • https://wordpress
    • 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_off000091a4.bin
a8b6219a48bdd69c2b906879e9dfd2c217494874a1fb8b92c704a6e8bd7e13bf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x91A4 8568 bytes

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