Malicious PDF — malware analysis report

Static analysis result for SHA-256 1252681531558873…

MALICIOUS

PDF

39.5 KB Created: 2020-03-19 05:39:52 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 4b995e43a4c4e4c5fd0497e8030205db SHA-1: 3cdb4d6f8845385a0543c2167743ca7a7697d4e2 SHA-256: 125268153155887348da6e751289e8acc7204ab21cc3d5ed1be5c426c8c1a3f8
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, suggesting a link farm or SEO manipulation tactic. The ML classifier also strongly indicated maliciousness. While no scripts were explicitly extracted, the embedded URLs are the primary indicators of malicious intent, likely directing users to potentially harmful content or further stages of an attack.

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://chrisbosgraaf.com/uploads/1/3/0/6/130622092/130622092.html#como+empezar+un+parrafo+de+introduccion+en+ingles
    • http://nationalbusinesseducationweek.com/uploads/1/3/0/6/130604145/9259827.pdf
    • http://www.awenindependentarts.com/uploads/1/3/0/4/130483276/xibolakod.pdf
    • http://fitforfreeboston.com/uploads/1/3/0/6/130639349/7722066.pdf
    • http://donutbarn.net/uploads/1/3/0/8/130874330/ba1457334f.pdf
    • http://www.skindeep-beautybar.com/uploads/1/3/0/2/130289161/90e19384b65aef.pdf
    • http://onlinewebcammodels.com/uploads/1/3/0/4/130489475/3ae6a40d4bda.pdf
    • http://whiteoutfilms.ca/uploads/1/3/0/5/130588676/fawuxisusole.pdf
    • http://luxvessentials.com/uploads/1/3/0/6/130603958/tadakegipo.pdf
    • http://www.theprepaidxperts.net/uploads/1/3/0/3/130313186/vupuzex.pdf
    • http://healthwithconfidence.com/uploads/1/3/0/5/130550998/livavubodipebal.pdf
    • http://nelsonbaypreschool.com/uploads/1/3/0/6/130621959/nomam.pdf
    • http://www.allisonyouderian.org/uploads/1/3/0/4/130483673/63971da07bf.pdf
    • http://cxomentor.net/uploads/1/3/0/6/130621305/lusiwesikis.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_off00006f33.bin
974c22e12d73ed1097bf1a9c2a552a0afec5dbd24964782225740782ab917a75		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6F33 8692 bytes

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