Malicious PDF — malware analysis report

Static analysis result for SHA-256 24af6d1963e30178…

MALICIOUS

PDF

39.8 KB Created: 2020-03-26 10:02:43 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: cf893e4b209dd06e082ff7cdbaab3f64 SHA-1: d038f389f100879e1dee892dcf06f66548a5e8e6 SHA-256: 24af6d1963e301789c293f03ea1498d0e6716b504f156e588b5055d7055a1d52
94 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, a technique often used for SEO manipulation or to distribute further malicious content. The ML classifier strongly indicated maliciousness, and the PDF_SEO_LINK_FARM heuristic confirms the presence of a mass external link farm. The embedded URLs point to various domains, suggesting a broad distribution or redirection strategy.

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://studioschmidt.us/uploads/1/3/0/6/130603850/130603850.html#formula+molecular+de+aldehidos
    • http://hostmaster.buyingapiano.info/uploads/1/3/0/4/130435762/goworapa.pdf
    • http://sarareads.com/uploads/1/3/0/6/130620839/xefufaxesuvi_lolabalap_mazel_komatasi.pdf
    • http://www.instantimprintsroswell.com/uploads/1/3/0/4/130483384/4978320.pdf
    • http://root.unitedworkerscongress.org/uploads/1/3/0/6/130620923/b3cf1ae.pdf
    • http://jmgproperties.net/uploads/1/3/0/4/130483507/5545871.pdf
    • http://www.lacuriowines.com/uploads/1/3/0/7/130739490/2190224.pdf
    • http://thesweetlifedesignercookies.com/uploads/1/3/0/7/130739904/sewunaruwexuponokuj.pdf
    • http://christinecaseyphotography.com/uploads/1/3/0/6/130604892/6563cc7a.pdf
    • http://perscriptum.net/uploads/1/3/0/5/130590257/80f8c8156.pdf
    • http://weddingdressnh.com/uploads/1/3/0/8/130873912/3600209.pdf
    • http://ajkesslerlaw.com/uploads/1/3/0/5/130542775/xewuber.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_off0000711d.bin
c2fbafc5e9dda4f25070848daae3924a89f32fa7e4f6963930ccc7a0ae59565c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x711D 8796 bytes

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