Malicious PDF — malware analysis report

Static analysis result for SHA-256 e65f3d8c83a0541f…

MALICIOUS

PDF

34.9 KB Created: 2020-06-21 07:51:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: eb51b492e5032d768049e0c5c9b70fcf SHA-1: f6b6d89b7e25622e85d8e20a1e88dcb889a5fd18 SHA-256: e65f3d8c83a0541f65747650bab65d55c0fd86ad4cd7fe6c34a4eceefcce30b9
96 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many of which point to other PDF files hosted on various domains. This behavior is indicative of a link farm or a lure to download further malicious content. The document body text and embedded URLs suggest a social engineering tactic, masquerading as a free PDF creator download to entice users to click on the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://gomriz.com/uploads/1/3/0/2/130274355/130274355.html#acrobat+creator+pdf+free+download
    • http://browniebites.ca/uploads/1/3/0/3/130323602/b3f995e18f.pdf
    • http://staceysltd.com/uploads/1/3/0/3/130323236/7849899.pdf
    • http://f-schreibt.de/uploads/1/3/1/3/131379858/xukemedipavujolabix.pdf
    • http://affordablechattanoogahandyman.com/uploads/1/3/0/6/130620585/daporefuduma_roxilivimofubu_veruvuf.pdf
    • http://bergnein.com/uploads/1/3/0/5/130545643/sunedodezole.pdf
    • http://marthabeautyguru.com/uploads/1/3/0/6/130604693/2737809.pdf
    • http://citycollegelibrary.com/uploads/1/3/0/5/130589338/resorijevatofof.pdf
    • http://podollansa.devsite-1.com/uploads/1/3/0/3/130379070/2051934.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004ba8.bin
37ba1148d6bac1cc9b298238fc02f4e6d512425cc089afdcb457463a44c3a19b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4BA8 4932 bytes
font_01_sfnt_off00005c7e.bin
73706da9b3898e09d452f92868b1b5e118d1c62c813e9231ea426e225760d1e8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5C7E 10340 bytes

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