Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf27a4951cae493c…

MALICIOUS

PDF

35.0 KB Created: 2020-04-12 13:07:26 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 090dc278c7d1210b5baf3eb3a0ee6867 SHA-1: 8e29fcc0c6101f9bfce8823bc3956c7c389045ca SHA-256: cf27a4951cae493ca48055af00ae7e401b9a9f8a8f3c5c84d2678a06087e0238
94 Risk Score

Malware Insights

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

This PDF file exhibits characteristics of a link farm or SEO spam, designed to drive traffic to numerous external websites. The document body contains text related to 'Clasificacion del derecho subjetivo prezi' and the file was generated by wkhtmltopdf, suggesting a programmatic creation for SEO purposes. The presence of a large number of external URIs, identified by the PDF_SEO_LINK_FARM heuristic, strongly indicates a malicious intent to redirect users to potentially harmful content hosted on compromised or malicious 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://trentriverdesigns.com/uploads/1/3/0/4/130476320/130476320.html#clasificacion+del+derecho+subjetivo+prezi
    • http://schwartzcolaw.com/uploads/1/3/1/1/131163996/vadumoful.pdf
    • http://dropincoaching.eu/uploads/1/3/0/6/130639335/fivatojugit_juwisopiloga.pdf
    • http://firstbreaksnooker.club/uploads/1/3/0/5/130589218/pewonetukok.pdf
    • http://logosbusinesssolutions.com/uploads/1/3/0/7/130739697/sijugigizimagutemeje.pdf
    • http://ponyfan.com/uploads/1/3/1/4/131452771/kikeposuf_jakewikabutejir.pdf
    • http://reupdesigns.net/uploads/1/3/1/3/131383426/jimodugenono_pavikobujaja.pdf
    • http://my-bjc.com/uploads/1/3/0/5/130551063/c051823eeedb5eb.pdf
    • http://brittso.com/uploads/1/3/1/4/131437655/donif.pdf
    • http://nawwclothing.com/uploads/1/3/0/4/130476555/pexuridufoxutolop.pdf
    • http://59ersband.net/uploads/1/3/0/2/130272978/1032607.pdf
    • http://vitriol.ch/uploads/1/3/0/6/130605435/8309037.pdf
    • http://wapac.org/uploads/1/3/0/6/130621642/fekabevaz.pdf
    • http://birdsbirdstaxidermy.com/uploads/1/3/0/3/130312976/10a222c.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_off00006245.bin
75ef9d5004aa3f7619d9136995411eaacff486e8b5d0d6116aab2f4a74875be0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6245 7540 bytes

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