Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba768ce5e24fd871…

MALICIOUS

PDF

46.8 KB Created: 2020-04-09 05:42:09 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: c50396db97cd53dfae39b0fca71a3ccf SHA-1: 07001960d47661dfbd68747948495645424403df SHA-256: ba768ce5e24fd87187015360e56d9ecc38c61e63e5316f7506cdc243c6321a4b
94 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, as indicated by the PDF_SEO_LINK_FARM heuristic. The ML classifier also flagged this PDF as malicious with high confidence. The document body, though partially corrupted, contains URLs that are part of this link farm. The primary attack pattern appears to be a link farm designed to direct users to a multitude of other PDF files hosted across various domains.

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://ghprn.com/uploads/1/3/1/3/131379392/131379392.html#caracteristicas+geograficas+del+medio+urbano+y+rural
    • http://sneakapeak.org/uploads/1/3/0/8/130813985/bakapolamejabugave.pdf
    • http://elgrifovegano.com/uploads/1/3/0/9/130969931/tabekesosukol.pdf
    • http://annquevillon.com/uploads/1/3/0/6/130620910/nixijig.pdf
    • http://pureandsimpletruthforyouth.org/uploads/1/3/0/8/130813899/3832392.pdf
    • http://project-418.com/uploads/1/3/1/0/131070006/puwisi.pdf
    • http://kingmaker-dales.com/uploads/1/3/0/6/130604065/deketigimidumajutu.pdf
    • http://kathrynmoorehair.com/uploads/1/3/1/4/131437832/febitutuzarularuli.pdf
    • http://criinternational.org/uploads/1/3/1/4/131405965/raxerufusozamures.pdf
    • http://lexily.ca/uploads/1/3/0/3/130379363/5643164.pdf
    • http://heidiwrites.org/uploads/1/3/1/4/131437378/e332cfb6ad9c.pdf
    • http://drsdriverrecruitmentsolutions.com/uploads/1/3/0/5/130543035/8918655.pdf
    • http://vfcarpetcare.com/uploads/1/3/0/7/130739140/xinov-wipudexunag-biratazupi.pdf
    • http://proradndt.com/uploads/1/3/0/2/130288883/823402.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_off00008c2f.bin
69bbcc06af7866ffc5d4cdafdd541a01592e119e6f75dcdc3890f5de6b11cca1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8C2F 8716 bytes

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