Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4eff1036f0df591…

MALICIOUS

PDF

28.6 KB Created: 2020-06-07 00:40:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e3eed84f54a32b84c94fb61c2cda27f2 SHA-1: 7957715bd7ecfb2c1cef20c2211b769b7082309e SHA-256: e4eff1036f0df59159fbcd5669c3f654c9983f8978522daf46fec41c0894d710
96 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier as malicious. It contains a large number of external links to other PDF files hosted on various domains, indicating a link farm or SEO abuse tactic. The document body contains garbled text but also includes URLs that are part of this link farm. The primary intent appears to be directing users to a network of external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://karenrobertschildcareservices.com/uploads/1/3/1/6/131637247/131637247.html#jugs+pitching+machine+parts
    • http://goodoldmrgreen.com/uploads/1/3/0/4/130483142/9718072.pdf
    • http://michaelroll.net/uploads/1/3/0/6/130605258/5890439.pdf
    • http://yulechengzhucesongqian.br3h.com/uploads/1/3/1/6/131636980/fozefav.pdf
    • http://virtualtour.guru/uploads/1/3/0/8/130813667/805d1c8887.pdf
    • http://drgimbel.net/uploads/1/3/1/6/131607027/32017.pdf
    • http://camp-star.de/uploads/1/3/1/8/131856391/nobebisutajulos.pdf
    • https://lovabizunepi.files.wordpress.com/2020/06/podafu.pdf
    • https://jojekuf.files.wordpress.com/2020/06/palogonobesaw.pdf
    • https://risuzonapi841266864.files.wordpress.com/2020/06/boxazinero.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_off000045d1.bin
a0c257e2a61cd7a2b6077c90c3e81896917ff0623c0ef72f06a980c0dd60af47		 pdf-font-stream PDF embedded font (sfnt) at offset 0x45D1 9836 bytes

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