Malicious PDF — malware analysis report

Static analysis result for SHA-256 021a1c1a5017f05b…

MALICIOUS

PDF

34.2 KB Created: 2020-04-15 02:02:53 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 2ede9a743dace287ff6608c7166f5a76 SHA-1: 74ac4e91b93ca6353a48ce7756e403722836347f SHA-256: 021a1c1a5017f05be251893c5c8e49cd586bda0605540051b876178258d49a6b
96 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, pointing to various domains. The embedded content, though heavily obfuscated, includes URLs such as http://jlnsolutions.com/uploads/1/3/1/3/131384567/131384567.html#bureaucratic+organization+pdf, suggesting a link farm or redirection scheme. The ML classifier strongly flagged this PDF as malicious, indicating a high probability of malicious intent behind the link distribution.

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://jlnsolutions.com/uploads/1/3/1/3/131384567/131384567.html#bureaucratic+organization+pdf
    • http://thekitchenshepherd.net/uploads/1/3/0/9/130969322/1181338.pdf
    • http://riyababyfood.com/uploads/1/3/1/3/131380008/waxojugiwew-pojevifuvulavo-mezadon.pdf
    • http://fairyvapestore.com/uploads/1/3/0/5/130590724/palam.pdf
    • http://ricardocariaga.com/uploads/1/3/0/5/130544257/vewopi-rivufibumavat-fopojotutalewoj-jiniwolebogol.pdf
    • http://mijneigencoach.com/uploads/1/3/0/2/130288394/zozijagijadusafodog.pdf
    • http://jonescleaning.org/uploads/1/3/1/6/131637658/jusodixej.pdf
    • http://mendingthreads.com/uploads/1/3/1/0/131070334/3183338.pdf
    • http://nangrayphotography.com/uploads/1/3/0/3/130379380/juwiwu_wogedef_rolozurigomolus.pdf
    • http://isabellasawyer.com/uploads/1/3/0/6/130605111/b76e0d02.pdf
    • http://themanegoodies.com/uploads/1/3/0/2/130291624/cd1c70dc91e1.pdf
    • http://ff-miami.com/uploads/1/3/1/4/131408614/63d2fea89d6f38.pdf
    • http://argusbuildingservice.com/uploads/1/3/0/7/130738554/7053452.pdf
    • http://myjgems.com/uploads/1/3/0/6/130604270/dilulatasefaxefiv.pdf
    • http://poolleak.icu/uploads/1/3/0/9/130969755/9317713.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_off0000615c.bin
a212b602cea2c93115ee74a53e36087e6eb1e49c163c8089723078956566ac7c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x615C 6920 bytes

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