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) First seen: 2020-09-24
MD5: 2c67009839c5c76047ca8105a40dcd68 SHA-1: 9a526f92576d28f92818777b45f8ea96fbb8f51f SHA-256: 7883ca9e51c2ebe5c3b00ddc9ffba0fbedb7653bd3602d436ff545ca40b42084
96 Risk Score

Malware Insights

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

The PDF document contains numerous embedded links to external websites, masquerading as a quizlet flashcards resource. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of these links, suggesting a coordinated effort to direct users to potentially malicious content. The ML classifier also strongly flagged this PDF as malicious. While no scripts were explicitly extracted, the embedded URLs are the primary indicators of malicious intent, likely serving as a distribution point for further payloads or phishing attempts.

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 PDF link annotation
    • http://poolcleaningstaugustine.com/uploads/1/3/0/8/130814966/e55580bec.pdfIn PDF document text
    • http://tesorosinteriors.com/uploads/1/3/0/6/130605010/171b9fa6023b891.pdfIn PDF document text
    • http://erichgeospatial.com/uploads/1/3/0/6/130639327/747d095e0d3b60.pdfIn PDF document text
    • http://mail.cbible.org/uploads/1/3/1/3/131384602/nulid.pdfIn PDF document text
    • http://bristolkitchenmakeovers.co.uk/uploads/1/3/0/6/130604911/73c48.pdfIn PDF document text
    • http://allnaturalproducts4you.com/uploads/1/3/0/5/130541846/vizobavugipexuf.pdfIn PDF document text
    • http://loveleen.familyanddivorcesolutions.com/uploads/1/3/1/3/131397987/nubuwuxazosifa.pdfIn PDF document text
    • http://investigatenyc.com/uploads/1/3/0/8/130814176/jatefeporufopiwo.pdfIn PDF document text
    • http://montagnysavoie.com/uploads/1/3/1/3/131380915/9542118.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://kopeboxapum.files.wordpress.com/2020/06/kudurelufisetowewake.pdfIn PDF document text
    • https://sabuninovaju.files.wordpress.com/2020/06/notebapetobuso.pdfIn PDF document text
    • https://fijurabowo.files.wordpress.com/2020/06/bixuvobesiwuzuso.pdfIn PDF document text
    • https://megelufebax.files.wordpress.com/2020/06/gefunurav.pdfIn PDF document text
    • https://mufawakesone.files.wordpress.com/2020/06/29848855929.pdfIn PDF document text
    • https://tepafufamuvi.files.wordpress.com/2020/06/sixisevenemupil.pdfIn PDF document text
    • https://disenajegen.files.wordpress.com/2020/06/nisol.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Related samples 2

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004ca2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4CA2 9732 bytes
SHA-256: 136f405b6b90de9b79121fa4038dad9530c1a5e85f046737d69dcca36967057e

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