Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b0795157da0043a…

MALICIOUS

PDF

39.9 KB Created: 2020-04-07 15:57:13 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 96363c0fdfaf09ab0265a1c1b5a72b6f SHA-1: 5225fee099e3d071774dd744ed6f9fd1a5fb5b8a SHA-256: 0b0795157da0043a9fff982161beb2c021367e6b5dc4e72a8e6124e346edeb39
96 Risk Score

Malware Insights

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

The PDF contains numerous external links, many of which point to other PDFs hosted on similar domains, suggesting a link farm or SEO spam operation. The document body, though partially corrupted, contains text related to scientific investigation and mentions wkhtmltopdf, indicating it was likely generated programmatically. The ML classifier strongly flagged this PDF as malicious, and the presence of many external URLs supports this assessment.

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://stewthompson2.com/uploads/1/3/0/4/130483052/130483052.html#el+principal+objeto+de+la+investigaci%C3%B3n+cient%C3%ADfica+es+el+de+descubrir+la+verdad
    • http://benjaminfaler.com/uploads/1/3/1/4/131407316/zejenidanebajef_nazadil_nosopoturanuf_vobenasebe.pdf
    • http://bondingfamilies.com/uploads/1/3/0/7/130774964/waludobafiga.pdf
    • http://merryll.com/uploads/1/3/0/5/130550657/8070217.pdf
    • http://qualitypropertiesllc.net/uploads/1/3/0/6/130604168/ae717f2b6afde4.pdf
    • http://awningsfarmington.com/uploads/1/3/0/5/130590777/c6dc85768afda77.pdf
    • http://construccionesengeneral.com/uploads/1/3/0/2/130289410/2165969.pdf
    • http://affettobali.com/uploads/1/3/1/4/131437924/28409b22bfee.pdf
    • http://ironenergy.net/uploads/1/3/0/5/130546136/ribojexafiva-vuvil-vutidowumebi.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_off00006db0.bin
26cc5e61a08a629758008ece4dea67015954d1ac792d5775b12a8b90c0c0ff16		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6DB0 9420 bytes

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