Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b1f125702ecf19a…

MALICIOUS

PDF

32.9 KB Created: 2020-04-04 16:33:31 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 0761e7598eb3aafb1097cdd0350bd9b0 SHA-1: 0e53f3189383a3b2415b0e4f50a37a0012c0dda0 SHA-256: 0b1f125702ecf19a89ae0e74d7baa2410e3d9e61ae506d088bc6bbc760f287da
96 Risk Score

Malware Insights

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

The PDF contains numerous external links, many of which are numerically or generically named, suggesting a link farm or SEO manipulation tactic. The document body, though partially corrupted, contains a reference to a "Dr brush mower owner's manual" and the authoring application "wkhtmltopdf", indicating the PDF was likely generated programmatically to host these links. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a malicious link distribution scheme.

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://jenniferschweitzer.com/uploads/1/3/1/4/131438241/131438241.html#dr+brush+mower+owner%27s+manual
    • http://cfs101.com/uploads/1/3/1/4/131406285/3904413.pdf
    • http://sdcaea.com/uploads/1/3/0/5/130551235/wukogitajebesal_rivatage_migadapanibat.pdf
    • http://mobilservredlist.com/uploads/1/3/0/9/130969249/5052585.pdf
    • http://aconsignmentgallery.com/uploads/1/3/1/1/131163640/571096.pdf
    • http://parkrapidshomeinspections.com/uploads/1/3/0/2/130270826/c6bca0637ec0.pdf
    • http://northcoastfoodtours.com/uploads/1/3/1/4/131453402/6914564.pdf
    • http://getbakedpottery.com/uploads/1/3/0/4/130483844/gelupil.pdf
    • http://praceziemneprusniewski.pl/uploads/1/3/0/2/130273980/420267.pdf
    • http://journeyhomedesigncompany.com/uploads/1/3/0/5/130538925/1115416.pdf
    • http://viasilvapannonia.com/uploads/1/3/0/6/130605175/zorexur-jajujabodave.pdf
    • http://busybuddhacoaching.com/uploads/1/3/0/2/130291551/c6b83f0f.pdf
    • http://gingerplumboy.com/uploads/1/3/1/4/131453031/gitulizolaje.pdf
    • http://saintsoutdooradventures.com/uploads/1/3/0/5/130588547/kanozonipeke_dodiwum.pdf
    • http://thepropharmlabs.com/uploads/1/3/0/6/130604896/wakiwivojaf.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_off00005560.bin
92440feb04028cb21ae71bb90f27af7c06b7351b49e6298293273359717ef450		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5560 9344 bytes

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