Malicious PDF — malware analysis report

Static analysis result for SHA-256 a83f32e7cb1b8e18…

MALICIOUS

PDF

39.1 KB Created: 2020-03-21 18:28:28 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 0b96ada8e60ad70af70b6b3bd694f52a SHA-1: 455a1af3a4b7c40d08b555b78c61366d6f6c43d6 SHA-256: a83f32e7cb1b8e183cc602da50b07ef397524366181727a72839459312f5bf53
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 to various domains, a technique commonly used for SEO manipulation or to host malicious content. The ML classifier strongly indicated maliciousness. The document body, though partially corrupted, contains a reference to 'Partes del sistema de direccion de un auto' and the wkhtmltopdf generator, suggesting a lure document. The primary attack pattern involves redirecting users through a network of PDF files hosted on numerous domains.

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://anthemmemorycare.net/uploads/1/3/0/5/130588861/130588861.html#partes+del+sistema+de+direccion+de+un+auto
    • http://registeryourdogs.com/uploads/1/3/0/6/130620202/2c931929b.pdf
    • http://mail.lavelcustomcrowns.com/uploads/1/3/0/6/130620871/1bea35f.pdf
    • http://inkgenio.it/uploads/1/3/0/7/130739121/vuxajuzivuxa_zipim_zezowimekar.pdf
    • http://grupoefad.com/uploads/1/3/0/5/130541443/4997926.pdf
    • http://rosshicksfitness.com/uploads/1/3/0/2/130287243/8973816.pdf
    • http://jhy3.com/uploads/1/3/0/9/130969809/mopuvofepofake.pdf
    • http://shipmenttracker.emaratshipping.com/uploads/1/3/0/7/130740165/349350.pdf
    • http://notobamabutmichelle.com/uploads/1/3/1/0/131070656/vopujo-dunenumosimu-moxefenemo.pdf
    • http://www.graniteconsultingscam.com/uploads/1/3/0/7/130739454/bbb5af.pdf
    • http://www.entertheblue.co.uk/uploads/1/3/0/2/130291358/penijezapa.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_off00006f8d.bin
5343b3b6b3d9519527f24f43a91bd4453c5345159e71bfd863bac0872708991d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6F8D 8424 bytes

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