Malicious PDF — malware analysis report

Static analysis result for SHA-256 39b07fbbfdaad5be…

MALICIOUS

PDF

28.9 KB Created: 2020-06-13 08:23:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0c1dbdbad077ac9b2858ada90302ed84 SHA-1: 03a16544270a87361d5424971e507ff2a98f06d0 SHA-256: 39b07fbbfdaad5be6262e73604ec7980f83023919d02e2477be45050168d29a5
94 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell T1204.002 Malicious File

The PDF file contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic. The document body, though partially corrupted, contains text related to meditation music and the authoring application, suggesting a deceptive lure. The primary attack pattern involves redirecting users to a network of suspicious PDF files hosted on various domains, likely for SEO spam or to distribute further malware. No scripts were extracted from this sample.

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://thisoklahome.com/uploads/1/3/0/4/130491599/130491599.html#krishna+flute+meditation+music
    • http://suvaraii.com.au/uploads/1/3/1/0/131070751/5cb654607c83.pdf
    • http://visual-career-guides.com/uploads/1/3/0/7/130739719/fafusesexixebudiku.pdf
    • http://jpm3i.com/uploads/1/3/0/5/130551155/5658330.pdf
    • http://aisagency.net/uploads/1/3/0/3/130313809/nufitivokedizut_pexox_tiralepuz_rezaxabogog.pdf
    • http://agriturismoilcastellaccio.com/uploads/1/3/1/3/131380383/gozekegos.pdf
    • http://sexybody.in/uploads/1/3/1/3/131380612/befojo_wejupuraf.pdf
    • http://74-123-76-114.mgwnet.com/uploads/1/3/1/1/131164479/9376122.pdf
    • http://gisouareinvest.com/uploads/1/3/0/4/130483153/tiluzijuwuxulu.pdf
    • https://difimedo.files.wordpress.com/2020/06/89541573321.pdf
    • https://roderip.files.wordpress.com/2020/06/degebutexe.pdf
    • https://koxiwipiledo.files.wordpress.com/2020/06/xilago.pdf
    • https://tekawixumep.files.wordpress.com/2020/06/84252330666.pdf
    • https://karutetok765055257.files.wordpress.com/2020/06/korikuze.pdf
    • https://saziwiri.files.wordpress.com/2020/06/79220928699.pdf
    • https://nopudup.files.wordpress.com/2020/06/lijatazipefiruzad.pdf
    • https://jezowiv.files.wordpress.com/2020/06/vimup.pdf
    • https://tasiruz.files.wordpress.com/2020/06/20537514512.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_off00004967.bin
9babc03bb1567c298c439edff5330ff62959484fb3e5b148e820e5de893f1e77		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4967 9032 bytes

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