Malicious PDF — malware analysis report

Static analysis result for SHA-256 6263621fed795beb…

MALICIOUS

PDF

47.1 KB Created: 2020-04-03 16:43:50 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: c1cad764f7354d8d981ae5adef976dfe SHA-1: 63ee78ddb38a3cf79e46f0a01250558b9f1fa0d9 SHA-256: 6263621fed795bebce7a0295439f11cc440524d000b8d621a972a60328dbd9e2
96 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to other PDF files on different domains. This behavior is indicative of a link farm or a method to distribute malicious content across many sites. The ML classifier strongly flagged this PDF as malicious, supporting the suspicious nature of the embedded links.

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://mainhealthsolutions.com/uploads/1/3/0/5/130588712/130588712.html#formule+de+cockroft+et+gault
    • http://moderncountrydoctor.ca/uploads/1/3/0/2/130271111/xefagupes_dubara_jitadoromemume_vururowugi.pdf
    • http://kjohanssonstudios.com/uploads/1/3/0/6/130604579/ferefibeg-fumof-pemovenexukizad-rukakefidofev.pdf
    • http://plumbingbellinghamwa.com/uploads/1/3/1/4/131410747/wavolomaj-xadis-gajomenos-gowolosuzoluga.pdf
    • http://505success.com/uploads/1/3/1/4/131437926/4974183.pdf
    • http://transatlanticconcepts.com/uploads/1/3/0/6/130621004/kufemot.pdf
    • http://aimiemorrisvocalstudio.com/uploads/1/3/1/3/131398204/4a212123db3.pdf
    • http://laextraordinaire.com/uploads/1/3/1/4/131405997/jetef.pdf
    • http://oventafoods.com/uploads/1/3/0/2/130289636/giwubu_dugoku_xefirinewip_musegetisug.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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/
    • https://fedoraproject.org/wiki/Licensing/LiberationFontLicense
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000068d2.bin
c68493fc35ab71c4931b26675a5f540cbeeb242227143cc37765c5dfe1ff3d5f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x68D2 11276 bytes
font_01_sfnt_off00008f2a.bin
eeec1f998adfa69d06b2bdea8e81a449d89a76918b49e6f4dcfd42bbc53311d4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8F2A 2684 bytes
font_02_sfnt_off000098be.bin
779aa567746046747dac965df7fdfb06ff632674a0a99ce247a327bf89f0fa63		 pdf-font-stream PDF embedded font (sfnt) at offset 0x98BE 16036 bytes

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