Malicious PDF — malware analysis report

Static analysis result for SHA-256 078cb1ba2a092c5e…

MALICIOUS

PDF

34.7 KB Created: 2020-06-01 20:47:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 51a0784210b49e70cf8d13e44952241d SHA-1: 7ea7a73b536ebee528eac3a3062d9d01f6e1a194 SHA-256: 078cb1ba2a092c5e9a634015f1e7c5b2b46bdc0093fd8fb2d825d6b7df740638
96 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic. The ML classifier also flagged this PDF as malicious with high confidence. While no scripts were explicitly extracted, the presence of numerous external links suggests a potential for redirecting users to malicious content or for SEO spamming purposes. The document body contains garbled text and what appears to be metadata from wkhtmltopdf, indicating it was likely generated programmatically.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://bettyswaner.org/uploads/1/3/1/3/131382486/131382486.html#lazarillo+de+tormes+vicens+vives+pdf
    • http://destinationstravelsolution.voyagerwebsites.com/uploads/1/3/1/6/131637953/tevawokotuduja_wivoke_xogox.pdf
    • http://lahaciendamx.com/uploads/1/3/0/8/130814040/4890441.pdf
    • http://allcareoflouisianainc.com/uploads/1/3/0/2/130288444/kiwefeweza.pdf
    • http://sherwoodparkpianolessons.com/uploads/1/3/0/8/130814921/3cf07.pdf
    • http://bigtreefashion1986.com/uploads/1/3/0/7/130776054/wotot.pdf
    • http://jordansplaylab.com/uploads/1/3/0/4/130476370/sasuzodopudufozutene.pdf
    • http://angelswinklashes.com/uploads/1/3/1/4/131406799/9546237.pdf
    • http://bettyswaner.org/uploads/1/3/1/3/131382486/terms.html
    • http://bettyswaner.org/uploads/1/3/1/3/131382486/dmca.html
    • http://bettyswaner.org/uploads/1/3/1/3/131382486/policy.html
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://belipumag.files.wordpress.com/2020/05/xozovuditixo.pdf
    • https://wubatelevad.files.wordpress.com/2020/06/56975735936.pdf
    • https://sokoson.files.wordpress.com/2020/05/lesomowodifexenuto.pdf
    • https://vadirukirog.files.wordpress.com/2020/05/litozabubipek.pdf
    • https://murulejam.files.wordpress.com/2020/05/98085588571.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005837.bin
1ae0f30936f820a00b21f49c889c2c3f0b79d83430724031483b5c2176670130		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5837 12020 bytes

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