Malicious PDF — malware analysis report

Static analysis result for SHA-256 7883ca9e51c2ebe5…

MALICIOUS

PDF

30.6 KB Created: 2020-06-10 13:27:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2c67009839c5c76047ca8105a40dcd68 SHA-1: 9a526f92576d28f92818777b45f8ea96fbb8f51f SHA-256: 7883ca9e51c2ebe5c3b00ddc9ffba0fbedb7653bd3602d436ff545ca40b42084
96 Risk Score

Malware Insights

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

The PDF contains a large number of external links to other PDFs hosted on various domains, a technique often used for SEO manipulation or to distribute malicious content. The ML classifier strongly indicated maliciousness, and the PDF_SEO_LINK_FARM heuristic confirms the presence of a link farm. The document body contains text related to 'music note flashcards quizlet' and wkhtmltopdf metadata, suggesting a lure to disguise the malicious link structure.

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://rosecityinspections.com/uploads/1/3/0/3/130323811/130323811.html#music+note+flashcards+quizlet
    • http://poolcleaningstaugustine.com/uploads/1/3/0/8/130814966/e55580bec.pdf
    • http://tesorosinteriors.com/uploads/1/3/0/6/130605010/171b9fa6023b891.pdf
    • http://erichgeospatial.com/uploads/1/3/0/6/130639327/747d095e0d3b60.pdf
    • http://mail.cbible.org/uploads/1/3/1/3/131384602/nulid.pdf
    • http://bristolkitchenmakeovers.co.uk/uploads/1/3/0/6/130604911/73c48.pdf
    • http://allnaturalproducts4you.com/uploads/1/3/0/5/130541846/vizobavugipexuf.pdf
    • http://loveleen.familyanddivorcesolutions.com/uploads/1/3/1/3/131397987/nubuwuxazosifa.pdf
    • http://investigatenyc.com/uploads/1/3/0/8/130814176/jatefeporufopiwo.pdf
    • http://montagnysavoie.com/uploads/1/3/1/3/131380915/9542118.pdf
    • https://kopeboxapum.files.wordpress.com/2020/06/kudurelufisetowewake.pdf
    • https://sabuninovaju.files.wordpress.com/2020/06/notebapetobuso.pdf
    • https://fijurabowo.files.wordpress.com/2020/06/bixuvobesiwuzuso.pdf
    • https://megelufebax.files.wordpress.com/2020/06/gefunurav.pdf
    • https://mufawakesone.files.wordpress.com/2020/06/29848855929.pdf
    • https://tepafufamuvi.files.wordpress.com/2020/06/sixisevenemupil.pdf
    • https://disenajegen.files.wordpress.com/2020/06/nisol.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_off00004ca2.bin
136f405b6b90de9b79121fa4038dad9530c1a5e85f046737d69dcca36967057e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4CA2 9732 bytes

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