Malicious PDF — malware analysis report

Static analysis result for SHA-256 50675c92d77f0268…

MALICIOUS

PDF

37.2 KB Created: 2020-05-10 22:56:44 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 2a28ce6ac2134a6149427b7e7be146b2 SHA-1: 83f6bc89220084ccff2dee58f3dce94c6f06e538 SHA-256: 50675c92d77f02687ed19dc17d87abc7ef74b0eb267f0c77412a8861e18c4455
96 Risk Score

Malware Insights

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

This PDF file exhibits characteristics of a link farm, containing a large number of external URLs pointing to various domains. The ML classifier strongly indicated maliciousness, and the PDF_SEO_LINK_FARM heuristic confirms the presence of numerous external links, suggesting a deceptive or manipulative purpose. The document body, though heavily obfuscated, contains references to 'calculus made easy book pdf' and the authoring application, which may be part of a lure.

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://namethebabybump.com/uploads/1/3/0/7/130775509/130775509.html#calculus+made+easy+book+pdf
    • http://betterspacesllc.com/uploads/1/3/1/3/131382491/4398c2d516.pdf
    • http://thebombbombs.com/uploads/1/3/0/2/130270894/gepepum.pdf
    • http://purpleclovefarms.net/uploads/1/3/0/6/130620878/waxozonaj-nugevifijakiwew-wifutuguwafi-motiperofi.pdf
    • http://mariscosplayaescondida.com/uploads/1/3/0/6/130620249/xolewiwusi.pdf
    • http://axiomshowdeals.com/uploads/1/3/0/5/130589401/dedar.pdf
    • http://oceanmediacity.com/uploads/1/3/1/3/131380730/tinidipuz.pdf
    • http://bbf-cafe.store/uploads/1/3/0/7/130775201/tokataxafudopesa.pdf
    • http://mosaico.ch/uploads/1/3/1/8/131856333/tosefebefojag_tepalep_peturevuzo_saniporol.pdf
    • http://housemedialimited.com/uploads/1/3/1/4/131453022/5831482.pdf
    • http://dodrug.com/uploads/1/3/0/5/130550741/kurezozunobig.pdf
    • http://xund.fit/uploads/1/3/1/4/131407158/2551353.pdf
    • http://mellissasanchez.com/uploads/1/3/0/9/130969357/dejod-kujenos.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • 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_off00005ad6.bin
33d80b5e357abfa3ea91f5eff18928953f8e36d8e9a7aea158c838e8ae756dd9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5AD6 2116 bytes
font_01_sfnt_off0000649f.bin
fe30844335a26466537988b853d688f70683976be1f7c5c111f42e57f02c551d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x649F 11144 bytes

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