Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c93e0a3efee463e…

MALICIOUS

PDF

34.9 KB Created: 2020-04-06 09:40:14 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 14e2253033645508ef18c5cd9abb2e6e SHA-1: a2370fed97108a3d552d629402f2baa6c88adbd1 SHA-256: 6c93e0a3efee463e9331dfd638176c11a3b8757f10291d9ca6a95a9d05db5682
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous external links, identified as a 'link farm', and the document body text suggests a lure related to an 'answer book'. The ML classifier strongly flagged this PDF as malicious. While no scripts were explicitly extracted, the PDF structure and embedded URIs indicate a likely attempt to redirect users to malicious or spam content, potentially leading to further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://tuitionhotsauce.com/uploads/1/3/0/7/130739024/130739024.html#the+answer+book+sam+gipp
    • http://leahrosemusic.com/uploads/1/3/1/1/131164485/fevogef_jidamo_beduw.pdf
    • http://voiceschorale.org/uploads/1/3/0/5/130590019/juzeluve_zavusopidenino.pdf
    • http://rarebreedmuzak.com/uploads/1/3/0/5/130546519/7739528.pdf
    • http://mediahau5.com/uploads/1/3/0/6/130604522/pigomiget.pdf
    • http://instrumentrating.net/uploads/1/3/0/2/130272616/keredefu.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_off00005f1c.bin
1c69fe6fb54261a7bbdc791004b52a4fc3d9425d591bb85d4a4c3b28498553f2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5F1C 8508 bytes

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