Malicious PDF — malware analysis report

Static analysis result for SHA-256 38378d01bca722f1…

MALICIOUS

PDF

31.2 KB Created: 2020-06-09 21:55:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0df850bb9641c9fa7c2659fa4e67bbbd SHA-1: a006509f8cf875756e80b312b19016c817001b8a SHA-256: 38378d01bca722f11af1454f5f1e2c0afaa9ef0bac47a0fdf2f86e2fa3e07fd6
94 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded external links, identified by the PDF_SEO_LINK_FARM heuristic. The ML classifier also strongly indicated maliciousness. The document body, though partially garbled, contains URLs that are part of this link farm. The primary function appears to be directing users to a multitude of other PDF files hosted across various domains, which is a common tactic for SEO manipulation or distributing further malicious payloads.

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://urg.brdge.org/uploads/1/3/0/5/130551197/130551197.html#%25C3%25B6l%25C3%25A7me+de%25C4%259Ferlendirme+ders+notlar%25C4%25B1+pdf
    • http://igrsrl.it/uploads/1/3/0/2/130271019/bavebewi_veboraridokejo_rudimejata_piwivitezov.pdf
    • http://hahcouture.com/uploads/1/3/0/5/130550652/rufede.pdf
    • http://blog.jorgedesoto.net/uploads/1/3/1/4/131406931/6e628e8fdaca016.pdf
    • http://bottlestobooksprimaryschool.com/uploads/1/3/0/7/130776885/9861044.pdf
    • http://sell.greentekelectronics.com/uploads/1/3/1/3/131398133/6517532.pdf
    • http://pool-paradies.de/uploads/1/3/0/6/130620888/niliwedexize-zisewolurozor-fapelotiwuw.pdf
    • https://pebeposag.files.wordpress.com/2020/06/rasidupijagajedofefuvu.pdf
    • https://zuwifevinep855643186.files.wordpress.com/2020/06/61406692874.pdf
    • https://tuwokovi.files.wordpress.com/2020/06/dimugotoforomok.pdf
    • https://sumexarit.files.wordpress.com/2020/06/29621410408.pdf
    • https://valekakixov.files.wordpress.com/2020/06/kujotipitixes.pdf
    • https://nusakotibo.files.wordpress.com/2020/06/32879933182.pdf
    • https://siluvewonuno.files.wordpress.com/2020/06/93691548276.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_off00004f61.bin
89f18c9e64f9a216a174f7f2ce455faf5383d2a729e3b97b7321a22986789568		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4F61 9836 bytes

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