Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9e9079d18959acb…

MALICIOUS

PDF

45.0 KB Created: 2020-04-08 20:57:20 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: d61d87965b3ead6a2f4be57aa51a96b0 SHA-1: 1ed54bb65a79273e234cabc6d90b2ff10a94f544 SHA-256: f9e9079d18959acb7f19e2c8d2e10a9cb6827f0f233f6b32ca705a234923728b
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 SEO poisoning attack, designed to drive traffic or distribute further malicious content. The ML classifier strongly supports the malicious nature of this PDF.

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://thelauragalegroup.com/uploads/1/3/1/0/131071114/131071114.html#limites+de+fonctions+exercices+corrig%C3%A9s
    • http://destig.net/uploads/1/3/0/3/130379391/3cecfa.pdf
    • http://triangelwings.com/uploads/1/3/0/7/130740187/lininiruzujigux.pdf
    • http://newimagerenovations.com/uploads/1/3/0/6/130639740/sarap.pdf
    • http://kindacreativedesigns.com/uploads/1/3/0/6/130621625/e9bb511.pdf
    • http://maggiebohannon.org/uploads/1/3/1/0/131071166/2508949.pdf
    • http://getsamson.com/uploads/1/3/0/6/130639311/e20ea.pdf
    • http://mugfordperformanceconsulting.com/uploads/1/3/0/3/130313673/ranad-lidodukitipab-kisivuw-wulove.pdf
    • http://freckledfields.com/uploads/1/3/0/7/130739204/6baa11d.pdf
    • http://parceriaturismoetransportes.com/uploads/1/3/0/3/130379104/621fffb8f8aef.pdf
    • http://bluelotuslavender.com/uploads/1/3/0/2/130272477/30360c6.pdf
    • http://urbanpeakmarketing.com/uploads/1/3/0/7/130776887/jarogiwi.pdf
    • http://rodsrvneeds.com/uploads/1/3/0/8/130874563/81ba4011100bf.pdf
    • http://dondealmuerzo.com/uploads/1/3/0/3/130313803/829b95cad.pdf
    • http://www.fortheloveofdogusa.com/uploads/1/3/0/6/130604388/rufoju_gipebolosudisid.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007dbb.bin
e47c10b520d990968cb15857f867dbe572723885202506018cdb117d5b4d4748		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7DBB 8336 bytes
font_01_sfnt_off00009b3c.bin
fafefca58569ab71c98438c913b939156ad2bf3ace198f4deac40d55ed74543d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9B3C 1844 bytes

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