Malicious PDF — malware analysis report

Static analysis result for SHA-256 a41cecf0e805be4b…

MALICIOUS

PDF

33.4 KB Created: 2020-03-23 15:52:47 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 29867675009572d527ed7f1808f0b14c SHA-1: 8abbb1fb897cab9da614b148ae0ee0a775cbad3c SHA-256: a41cecf0e805be4b613acf36c1e58e159647b0472be0730ae8f21d01f2ba8d51
96 Risk Score

Malware Insights

MITRE ATT&CK
T1598 Stage Capabilities: Gather Victim Identity Information T1204 Malicious Link

The PDF contains a large number of external links to other PDF files hosted on various domains. This pattern is indicative of a link farm or SEO manipulation tactic, potentially used to distribute malware or phish for information. The ML classifier strongly flagged this PDF as malicious, supporting the suspicious nature of the numerous external links.

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://blackfilmcentre.org/uploads/1/3/0/7/130738881/130738881.html#convert+quadratic+equation+into+vertex+form
    • http://tkbent.com/uploads/1/3/0/7/130775162/vujek-zuxejepabobemab.pdf
    • http://iamcultured.shop/uploads/1/3/0/6/130622042/rulujolukidon-wasepipato-votizuxamiz.pdf
    • http://ivneglobalservices.org/uploads/1/3/0/7/130739026/xolinuxatobolavurag.pdf
    • http://realitywhisperer.com/uploads/1/3/0/8/130813877/kifiboripexunag.pdf
    • http://anatomyfinalproject.com/uploads/1/3/0/4/130491271/fivomozixigow.pdf
    • http://autodiscover.clubedouroxtreme.com/uploads/1/3/0/7/130739454/pesodasefokido.pdf
    • http://smallschoolspirit.com/uploads/1/3/0/6/130639962/xerukaxub.pdf
    • http://hostmaster.mutualdialogue.co.uk/uploads/1/3/0/7/130739654/2731861.pdf
    • http://rachf1.com/uploads/1/3/0/6/130620631/dulixelazamudex.pdf
    • http://vigilservicesgroup.com/uploads/1/3/0/7/130775715/nuvesij.pdf
    • http://sourceenergyrecords.com/uploads/1/3/0/5/130590469/2ccc10176495bea.pdf
    • http://nurturesf.com/uploads/1/3/0/6/130603852/6324225.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_off00005bca.bin
b94ce2fea663ee50d560e1b3c329d41c9df8eacbba1e39319f3bd2e42fb68fd1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5BCA 7204 bytes

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