Malicious PDF — malware analysis report

Static analysis result for SHA-256 12c43628d50e9aec…

MALICIOUS

PDF

34.8 KB Created: 2020-06-13 20:22:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ed97a7235604ff28129de1260bd2aba4 SHA-1: 08bca123b5b07cc72907a6a5255a4f055b47e5ca SHA-256: 12c43628d50e9aec93edc01a3246600efd4831d5a7d372272748ae3b33370cbc
96 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, identified by the 'PDF_SEO_LINK_FARM' heuristic. The embedded document body also contains URLs pointing to external PDF files. These links are likely intended to redirect the user to malicious or spam content, possibly for SEO manipulation or to host further malicious payloads. No scripts were extracted, but the presence of numerous external links suggests a phishing or redirection attack.

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://toadblue.net/uploads/1/3/0/5/130543006/130543006.html#recuva+en+espa%25C3%25B1ol
    • http://talkswithtracy.com/uploads/1/3/0/4/130475994/nunelipolug-mefeza-pevatapa-jozuziburu.pdf
    • http://caseforoptimisim.org/uploads/1/3/0/6/130621119/tafililam-kudizoreronalav.pdf
    • http://autodiscover.mgmhaberdashery.com/uploads/1/3/0/7/130775104/5453844.pdf
    • http://1998skateboards.com/uploads/1/3/0/6/130621447/5020272.pdf
    • http://host52.carmichaelnl.com/uploads/1/3/1/3/131380786/5368885.pdf
    • http://wpstage.facto.pro/uploads/1/3/0/6/130621296/2eec0edd5bea7.pdf
    • http://apalabarclay.com/uploads/1/3/0/2/130291646/878f3b0705fc84.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://nebosevali.files.wordpress.com/2020/06/zuzisilimolojevel.pdf
    • https://kapavefewo.files.wordpress.com/2020/06/90212449300.pdf
    • https://bakovenorow.files.wordpress.com/2020/06/5624314709.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005885.bin
b74ed219ee599d6661e3265d201cc211da0006f92900aac7a629012af39bc927		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5885 11892 bytes

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