Malicious PDF — malware analysis report

Static analysis result for SHA-256 7e6ba81728b66a73…

MALICIOUS

PDF

40.0 KB Created: 2020-03-28 11:56:08 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 50b80ae93980124e79e43dd95fc10c95 SHA-1: 5fb4284946fbe4b59f7d6b9ea7b3b589680a3752 SHA-256: 7e6ba81728b66a73787aac454969226fd0f52348a1ab224feb1574657f54f2fd
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of embedded external links, identified by the PDF_SEO_LINK_FARM heuristic. The document body, though partially obfuscated, contains the title 'Objetos con letra j a color' and references wkhtmltopdf, suggesting it's a generated document. The primary function appears to be directing users to a network of external PDF files, likely for SEO spam or to host malicious payloads.

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://teekyathanda.org/uploads/1/3/0/3/130323485/130323485.html#objetos+con+letra+j+a+color
    • http://www.quinmcintire.com/uploads/1/3/0/6/130604315/21c8105a4e08279.pdf
    • http://sublimetravels.com/uploads/1/3/0/2/130271124/pakipafokota-tukepexonavi-wewasewobazu-jewuxa.pdf
    • http://goingfurniturerestoration.com/uploads/1/3/0/7/130739470/6509161.pdf
    • http://gayflava.com/uploads/1/3/0/6/130639841/rikexa_gataxog.pdf
    • http://icreatestudio.org/uploads/1/3/0/5/130589135/9993162.pdf
    • http://blossom.ch/uploads/1/3/0/4/130483909/tenawajamatoxi.pdf
    • http://shesellsseashellsjewelry.com/uploads/1/3/0/7/130740568/jokaxazu.pdf
    • http://sort-it-now.com/uploads/1/3/0/4/130435748/5171446.pdf
    • http://catalyst-now.com/uploads/1/3/0/3/130323324/1097762.pdf
    • http://alannahbarkerart.com/uploads/1/3/0/2/130289792/2526287.pdf
    • http://darronhargreaves.com/uploads/1/3/0/4/130436202/829649.pdf
    • http://www.coldcreekllc.net/uploads/1/3/0/8/130874278/guzinifux-xosawovinoz.pdf
    • http://ontariocaairporthotel.com/uploads/1/3/0/5/130550775/2747354.pdf
    • http://wayisee.com/uploads/1/3/0/5/130551245/nanezigarezew.pdf
    • http://www.gmpunjabideals.com/uploads/1/3/0/6/130640024/e340822cc9ba.pdf
    • http://batchatxmembers.com/uploads/1/3/0/6/130603903/dimukexoranutub.pdf
    • http://lucynelle.net/uploads/1/3/0/6/130639998/261279.pdf
    • http://osteokinetic.net/uploads/1/3/0/8/130874376/9d238.pdf
    • http://mobilheimoesterreich.eu/uploads/1/3/0/4/130488503/820c5.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_off00006fa8.bin
625a1e45240c4a2eb91eb2a37d6c7c302ac63e65d90264ab613d8dce658cfb1b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6FA8 9352 bytes

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