Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f23ba2039f0b8fe…

MALICIOUS

PDF

37.4 KB Created: 2020-03-25 00:04:44 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 100281e8ea0661c50699e1bdbe389136 SHA-1: fa7e633f452f14a1c0cf7679520e1aba921d3048 SHA-256: 3f23ba2039f0b8fef037686f29d079994f5ff18cf779b1de79f4361a7b027022
94 Risk Score

Malware Insights

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

This PDF document is classified as malicious by an ML model and exhibits characteristics of a link farm, containing numerous external links to other PDF files and HTML pages. The document body, though partially obfuscated, includes a URL that appears to be a lure related to 'vida digna en colombia'. The primary attack pattern involves directing users to these external resources, likely for further malicious activity.

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://mcclainscatering.com/uploads/1/3/0/6/130639729/130639729.html#que+es+vida+digna+en+colombia
    • http://napervillecarpetclean.com/uploads/1/3/0/3/130323620/b9f739967.pdf
    • http://admin.fairerfostering.org.uk/uploads/1/3/0/5/130540926/540586.pdf
    • http://zoppideafcamp.com/uploads/1/3/0/4/130436147/5751350.pdf
    • http://nuvoleonline.com/uploads/1/3/0/6/130639410/4177632.pdf
    • http://careoxygen.com/uploads/1/3/0/7/130774973/1751640.pdf
    • http://isladelplacer.com/uploads/1/3/0/3/130313319/22805282a.pdf
    • http://www.yankeenewfoundlands.com/uploads/1/3/0/5/130589199/pagofusi.pdf
    • http://ahs-2020.com/uploads/1/3/0/2/130270847/mekajotitedum-peber-vekavebube.pdf
    • http://ymkpt.info/uploads/1/3/0/8/130874514/sesogipas-zikizunidonirux-peludam-jemitubu.pdf
    • http://field-tek.com/uploads/1/3/1/1/131163658/a8df920.pdf
    • http://loudesigns.net/uploads/1/3/0/5/130588597/rubijefevijufulan.pdf
    • http://affordablevisualconcepts.com/uploads/1/3/0/7/130775192/1631270.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_off0000683a.bin
488a68ad816e18359c86e27a86b24c229066dcf2b0b7af1763a678b6f3332334		 pdf-font-stream PDF embedded font (sfnt) at offset 0x683A 8528 bytes

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