Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c2f13d41ec94eed…

MALICIOUS

PDF

49.8 KB Created: 2020-04-09 12:31:30 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 1fa7a30b31484cf6f65d49e04b6d2d7c SHA-1: ca04ad31a8974007e694d923308061db5e7624c9 SHA-256: 4c2f13d41ec94eed0ca3f8915c51780b280614a6a9fc04ae7c0ab89c4d282681
94 Risk Score

Malware Insights

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

The PDF file contains a large number of external links to other PDF documents hosted on various domains. This behavior is indicative of a link farm, often used to manipulate search engine results or to distribute further malicious content. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a malicious intent. No scripts were extracted, and the document body text is heavily corrupted, making it difficult to ascertain a specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://bestplacesinohio.com/uploads/1/3/0/5/130588267/130588267.html#ver+pelicula+la+caba%C3%B1a+cristiana+completa
    • http://welovemolly.com/uploads/1/3/1/4/131409755/tokasupamupuvil-sudegidopumufo.pdf
    • http://mymontagne.com/uploads/1/3/0/6/130604423/gufakikabop_vokibosunodos.pdf
    • http://fovero.us/uploads/1/3/0/6/130639607/mexelesofejir_febub_busel_vaxepeganaw.pdf
    • http://naturaliq.org/uploads/1/3/0/3/130323392/7954831.pdf
    • http://glassconceptinc.net/uploads/1/3/0/5/130540882/jiterelaxaxejex.pdf
    • http://andersonhistoricalsociety.com/uploads/1/3/0/2/130270985/1235076.pdf
    • http://reddotinvestors.com/uploads/1/3/0/5/130588821/degobekoxozuxenu.pdf
    • http://hotelvic-phase2-ja.devsite-1.com/uploads/1/3/0/9/130968942/30cef.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006e15.bin
5278024270de67705d3a5034a26ce2f5e1d9e53f50705cc770b2190155f81e7b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6E15 6728 bytes
font_01_sfnt_off00007eb9.bin
f544d01c5290df6cbfbaa73ebb0e1064540e005ab3ff0b6e5da8e9ca9f866310		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7EB9 10524 bytes
font_02_sfnt_off0000a26d.bin
77966d09b5102a30d8ff8aa785e628bf197b3c0327fd11fee8dea0ac6f1fe098		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA26D 16080 bytes

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