Malicious PDF — malware analysis report

Static analysis result for SHA-256 482ebe71ceb75a4d…

MALICIOUS

PDF

38.4 KB Created: 2020-04-12 17:02:48 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: e37f88890b1ce7dc134508e2f530ef5e SHA-1: 89520bac84497e60f978d7c09db97d4003ca0f35 SHA-256: 482ebe71ceb75a4de2238f18cb99ebf7035b5c06d3b8109c723a7c4132cc590c
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF file contains numerous external links, many of which point to seemingly unrelated domains with numeric or generic slugs, indicative of a link farm or SEO spam tactic. The primary lure appears to be a product name like 'Casio aq-164wd-1avdf pakistan', directing users to a suspicious HTML page. The ML classifier strongly flagged this PDF as malicious, and the presence of multiple SEO-linked URLs suggests an attempt to distribute malicious content or phish users by overwhelming search engines with content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://maeganprovan.com/uploads/1/3/0/9/130969751/130969751.html#casio+aq-164wd-1avdf+pakistan
    • http://liveactionworld.com/uploads/1/3/0/5/130590637/kotikolitepor.pdf
    • http://shop.packtenna.com/uploads/1/3/0/5/130544232/4989886.pdf
    • http://aureliakbrown.com/uploads/1/3/0/5/130590209/guponoba_guzopogu.pdf
    • http://loveisthefirstingredient.com/uploads/1/3/1/0/131070080/zaziti_kigipus_lisag.pdf
    • http://buenavistawesleyan.org/uploads/1/3/0/9/130968920/vedosaroxades-tixerudozafoj-muzavul-wewutegekapa.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005874.bin
0cf143c5564f1c21108659677d2942c1a7c0cff8c6c8abb9b9d69cb41f143c34		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5874 7712 bytes
font_01_sfnt_off00007687.bin
5b017b2c678c5ddefd8ffb66d7027ef90950cdfdabb5d4c539b1d60f7646226d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7687 16304 bytes

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