Malicious PDF — malware analysis report

Static analysis result for SHA-256 6e4348029b2ec257…

MALICIOUS

PDF

40.8 KB Created: 2020-03-25 01:22:11 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 43aedd0ac86ffe04c8a182e540412552 SHA-1: 1e2c739106262e70736f92c00dffc6c52a97285d SHA-256: 6e4348029b2ec2575c03fe2002076b47250fc76e2cfb97c835f865f07ba898b6
96 Risk Score

Malware Insights

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

The PDF contains a large number of external links, indicating a link farm or redirection scheme. The ML classifier strongly flagged this PDF as malicious, and the presence of numerous URLs suggests an attempt to direct users to potentially harmful content or further stages of an attack. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document designed for user redirection.

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://fatlossfitness.net/uploads/1/3/0/8/130874591/130874591.html#cu%C3%A1les+son+las+funciones+mentales+b%C3%A1sicas
    • http://www.vitallosis.org/uploads/1/3/0/6/130621574/1e2d8d473.pdf
    • http://clyburnartistry.com/uploads/1/3/0/7/130738614/timibosive_xolanure_buderelu.pdf
    • http://masonteam.us/uploads/1/3/0/5/130551387/nasugujubulatuzob.pdf
    • http://microfiberexpress.com/uploads/1/3/0/7/130775982/dezubi_lapago_mesobutodefuf.pdf
    • http://sweetsmilebrigaderiagourmet.org/uploads/1/3/0/2/130288875/vepirelokur_mekixi.pdf
    • http://kristienienabercounseling.com/uploads/1/3/0/5/130551402/1783576.pdf
    • http://paulloveslauren.com/uploads/1/3/0/2/130289510/kuvugoruzogalemaz.pdf
    • http://cravecookiedough.com/uploads/1/3/0/3/130324167/376737.pdf
    • http://ecomodbox.net/uploads/1/3/0/6/130603811/6456831.pdf
    • http://weisseslicht.com/uploads/1/3/0/5/130550982/disoroxomipomebu.pdf
    • http://venturavineyards.com/uploads/1/3/0/7/130739625/6062414.pdf
    • http://botargosantorini.com/uploads/1/3/0/6/130604820/98f27dd5d3b3e94.pdf
    • http://greenmarch.co.uk/uploads/1/3/0/4/130488829/dewukadajutij-mumesuwi.pdf
    • http://www.weddingpartyangels.co.uk/uploads/1/3/0/2/130289173/4226691.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_off00007455.bin
b6f63a2e4249a5084c1bc729aa39b5b70742218e3069b9924fa43e0f5dafdbf7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7455 8540 bytes

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