Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5f385dd855c2cd8…

MALICIOUS

PDF

37.2 KB Created: 2020-04-07 08:16:30 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: ef041dd17540e96d8072b8e194ea2b04 SHA-1: c88311c68a948c36443fa9215b7dd03685f3302d SHA-256: a5f385dd855c2cd83e80686d144c8f788899fef0bcb7fac187619224a6461ae9
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious File

The PDF contains a large number of external links, a technique often used for SEO poisoning or to redirect users to malicious sites. The ML classifier strongly indicated maliciousness. The document body, though partially corrupted, contains references to a pressure cooker manual and the wkhtmltopdf tool, suggesting a lure document. The primary attack pattern involves directing users to a link farm of PDF files hosted on numerous 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://yarmouthpride.net/uploads/1/3/0/2/130272928/130272928.html#fagor+rapid+express+pressure+cooker+instruction+manual
    • http://montrealelite.ca/uploads/1/3/0/8/130814576/wojosatowizojaxedan.pdf
    • http://mindbodymend.com.au/uploads/1/3/0/7/130775451/09796f9ad7360.pdf
    • http://veryimportantfans.com/uploads/1/3/0/6/130640053/xupat.pdf
    • http://paulanthonymcgill.com/uploads/1/3/0/6/130604639/3fc2e889e83745.pdf
    • http://shopbelfast.info/uploads/1/3/0/6/130620450/492289.pdf
    • http://dracoshairco.com/uploads/1/3/0/5/130589064/vabimosogo_numusiz_nizozepewo_lagejigerof.pdf
    • http://safehomekit.com/uploads/1/3/0/3/130323319/7125824.pdf
    • http://papatonypizza.com/uploads/1/3/0/3/130379398/7293103.pdf
    • http://casadeamorelsalvador.org/uploads/1/3/0/6/130639837/vigexazevalixu.pdf
    • http://sportsputting.com/uploads/1/3/0/6/130621038/b0465bf699.pdf
    • http://lindaleibfarth.com/uploads/1/3/0/7/130775731/zekujogubofa_kalizomegatuw.pdf
    • http://skincandysoapworks.com/uploads/1/3/0/7/130740537/1505891.pdf
    • http://thewildharemanagementgroup.com/uploads/1/3/0/5/130588809/bc7867abc0a5f.pdf
    • http://artseverlasting.com/uploads/1/3/0/6/130639307/5102ebfd7fd.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_off000066a4.bin
8dd72efdfc9c9fc517c3b3aed1d16d2bbd8d93502490a01e6d86ec741cabc3da		 pdf-font-stream PDF embedded font (sfnt) at offset 0x66A4 8604 bytes

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