Malicious PDF — malware analysis report

Static analysis result for SHA-256 746eb4e5c6ccd6c1…

MALICIOUS

PDF

36.8 KB Created: 2020-04-15 16:05:08 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 416a4c5a496913dc4af464b3836bdd03 SHA-1: cfa0278d42c5e2af284f8f3d184f842889a25bdd SHA-256: 746eb4e5c6ccd6c13a584f53a480a3a72251e75a8cac6c197220fd5d08459ba8
96 Risk Score

Malware Insights

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

The PDF document contains numerous external links, many of which are numerically or generically named, suggesting a link farm or SEO poisoning tactic. The document body, though partially obfuscated, contains text related to a 'continence assessment form' and a URL, indicating a lure to click on potentially malicious links. The ML classifier strongly flagged this PDF as malicious, and the presence of many external links points towards a phishing or redirection attack.

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://mysaphi.com/uploads/1/3/0/4/130477663/130477663.html#hse+continence+assessment+form+for+nursing+homes
    • http://acomputerconsultant.net/uploads/1/3/1/0/131070054/xebuka.pdf
    • http://myrivergypsy.com/uploads/1/3/0/7/130775209/898bf0b137.pdf
    • http://gregstevens-design.com/uploads/1/3/0/7/130775905/rewubo-nudalogajawige.pdf
    • http://equity-finance.net/uploads/1/3/0/9/130969895/dulilatodixive_dojefotonig_pivemiwolit.pdf
    • http://flexledhd.com/uploads/1/3/0/5/130550912/5eba99712eb72.pdf
    • http://atlbloggers.com/uploads/1/3/0/5/130550706/3518967.pdf
    • http://laurenvirginiaalbert.com/uploads/1/3/0/6/130621973/0357433774.pdf
    • http://jarickcontracting.ca/uploads/1/3/1/4/131453076/juwezigov.pdf
    • http://youthunitedproject.com/uploads/1/3/1/3/131384721/9109609.pdf
    • http://100places.de/uploads/1/3/1/0/131070771/5887079.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_off00006995.bin
cc3f816fa12bef7b833fc8b26966efcf9e5f4fbbf42ba8eecd3628db49890857		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6995 7016 bytes

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