Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c83849613d5b561…

MALICIOUS

PDF

42.3 KB Created: 2020-03-28 03:27:05 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: f7ba0f922ec38f3bf0d5bfafedab1b44 SHA-1: 3b54a307519cf286ea52eeba831896d5c0eb030e SHA-256: 3c83849613d5b5619ffc4f9362645f2a137e5acbff603a810b92c181b5badc1d
94 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, a technique often used for SEO manipulation or to redirect users to malicious sites. The ML classifier strongly indicated maliciousness. The presence of numerous links to PDF files hosted on various domains suggests a link farm or a distribution mechanism for further payloads.

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://block1949-asu.com/uploads/1/3/1/1/131163981/131163981.html#escala+fahrenheit+e+celsius
    • http://experiencetrafalgar.com/uploads/1/3/0/5/130540592/399625.pdf
    • http://ramixes.com/uploads/1/3/0/6/130604599/576b3fc.pdf
    • http://www.upstatevisualpropertyservices.net/uploads/1/3/0/5/130588842/07ff9290328.pdf
    • http://intobritsworld.com/uploads/1/3/1/0/131070293/628284.pdf
    • http://fsq.me/uploads/1/3/0/6/130621501/kezemizadur.pdf
    • http://wordsforhumanity.com/uploads/1/3/0/4/130483138/1950113.pdf
    • http://thestudcenter.com/uploads/1/3/0/3/130323836/silejefe.pdf
    • http://sweetpeaphotographydc.com/uploads/1/3/0/7/130739415/pitofudixikivuvikux.pdf
    • http://nationwidetaxfinancialservices.com/uploads/1/3/0/6/130621072/xalosuf.pdf
    • http://horbtn.org/uploads/1/3/0/5/130588337/vosolufudi.pdf
    • http://squishnaturalgroup.com/uploads/1/3/0/4/130488069/4755009.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006de9.bin
c65f42520440b1ad167e44c659544c42682d175cef7857ead5ed2c774fcb1ed4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6DE9 10348 bytes
font_01_sfnt_off00009105.bin
e91619dfd4c72a85464d95ef1ba4e67df13020651c42071bafbe521a61d9f7fc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9105 2652 bytes

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