Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b1b3463902b2467…

MALICIOUS

PDF

32.6 KB Created: 2020-04-05 08:00:41 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 774da2877c2922652febc9f2cc584ee7 SHA-1: e61dc749d4e6a286fec836107f028d5fb5c04649 SHA-256: 5b1b3463902b246714381a38e919561d019b060757d9728d460d571d9fb5fe95
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded external links, identified by the PDF_SEO_LINK_FARM heuristic. The document body text, though partially corrupted, includes a reference to calculating molecular mass, suggesting a potential lure. The primary attack pattern involves directing users to a network of linked PDF files, likely for malicious redirection or content delivery.

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://richkane.biz/uploads/1/3/0/5/130551116/130551116.html#calcular+la+masa+molecular+de+la+glucosa
    • http://urquietaortholab.com/uploads/1/3/0/2/130291040/7719840.pdf
    • http://nailsbyauxilia.net/uploads/1/3/0/8/130814238/30d02d4202be2c.pdf
    • http://otamadvogados.com/uploads/1/3/0/6/130639212/viladotem.pdf
    • http://katmoranpublications.com/uploads/1/3/0/5/130588937/kigigozuweras_wanabaxane_ledavera_nitopikova.pdf
    • http://montgomerypoolcleaners.com/uploads/1/3/1/3/131384249/detinutuk-wipipur-kovanuje.pdf
    • http://claiminghisgrace.com/uploads/1/3/0/7/130739478/telasab_defilisamil.pdf
    • http://vuongglobal.com/uploads/1/3/0/6/130604006/2be6c1.pdf
    • http://retirementcrisisamerica.com/uploads/1/3/1/0/131069915/jagep_zuxatu.pdf
    • http://onesourcebaltimore.com/uploads/1/3/0/7/130740374/kopokogupafoxo.pdf
    • http://welloiledmamadesigns.com/uploads/1/3/0/6/130639782/1747528.pdf
    • http://rickyjab.com/uploads/1/3/1/4/131438248/rereledobab.pdf
    • http://gemmillion.com/uploads/1/3/0/7/130775510/jamag.pdf
    • http://supoaklandstreetfood.com/uploads/1/3/0/2/130273625/romuxapi.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_off00005803.bin
f8aaec6ad45f95bee9350a30142d28ba53dc74eee607453afc8ba6c90dbe676e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5803 7372 bytes

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