Malicious PDF — malware analysis report

Static analysis result for SHA-256 d72febc25dc96670…

MALICIOUS

PDF

39.9 KB Created: 2020-04-02 17:39:58 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: d5a3bc85b4a29f1a055195a3a2b86ee6 SHA-1: d1f6ab838e718d1a1b4194485623a38fe9b082d2 SHA-256: d72febc25dc96670c7f4b497566698052b6c2ac62435b1440460c3cfa114e04f
94 Risk Score

Malware Insights

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

The PDF contains a large number of external links, a technique commonly used to redirect users to malicious websites or further stages of an attack. The ML classifier strongly flagged this PDF as malicious, and the 'PDF_SEO_LINK_FARM' heuristic indicates a deliberate attempt to create a large number of outbound links. The embedded URLs point to various domains, suggesting a broad distribution or evasion strategy.

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://chloeimaan.com/uploads/1/3/0/6/130603944/130603944.html#hexes+and+curses
    • http://lindsaykpatton.com/uploads/1/3/0/6/130604086/32d883eb.pdf
    • http://dynamiteseafood.com/uploads/1/3/1/0/131070291/dagaw_taror.pdf
    • http://jaxoftrades.info/uploads/1/3/0/2/130270956/zibabotabadabol.pdf
    • http://welcometokhaos.com/uploads/1/3/0/7/130739396/76b725ce.pdf
    • http://www.jhowcandleco.com/uploads/1/3/1/0/131069806/bevonadi-sadopa-nevitobiraze.pdf
    • http://mhessential.net/uploads/1/3/0/5/130539944/mokilapik.pdf
    • http://krystalfestival.com/uploads/1/3/0/2/130272500/rimujoriza_nitokamosel_ruzijuneg_piriwox.pdf
    • http://deathcareaware.com/uploads/1/3/0/2/130271217/119570.pdf
    • http://wildtwilight.ca/uploads/1/3/0/6/130639356/bubutag.pdf
    • http://thehiphopsutra.com/uploads/1/3/0/3/130323811/30e22.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_off000069a1.bin
1d42ebf0466e08c56357c75c7da1d08f3d4cdaf9064a4f69fa29abeec341cdd9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x69A1 8640 bytes
font_01_sfnt_off00008aab.bin
83459e82cebe561b9e65dda6a09953c9e35f75e5df0fa62a624e1833cc5b8086		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8AAB 1708 bytes

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