Malicious PDF — malware analysis report

Static analysis result for SHA-256 e5259e0ee994d0df…

MALICIOUS

PDF

48.5 KB Created: 2020-04-06 06:25:33 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 3428a7168150e25843a499d24e529778 SHA-1: af103e7ada89dff638e04cad4e341f66652f6c3d SHA-256: e5259e0ee994d0df50f1035cd0f9f2f7cff62b71c694e04ac4a6adc7621ee97d
94 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, pointing to various domains. The ML classifier also strongly indicated maliciousness. The primary attack pattern appears to be a link farm, likely used for SEO manipulation or to distribute further malicious content via the numerous linked PDFs.

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://trinitydistribution.net/uploads/1/3/0/6/130621038/130621038.html#meaning+of+song+michael+row+the+boat+ashore
    • http://abdriveracademy.com/uploads/1/3/0/5/130541688/6682d14df68584b.pdf
    • http://insidecampuscorner.net/uploads/1/3/0/2/130287866/buvonaworevus-badidulopiw-pisiveferul-pexekusobared.pdf
    • http://summerfly.com/uploads/1/3/0/4/130483656/4498569.pdf
    • http://purensimpleohio.com/uploads/1/3/0/7/130738534/bitutatakafedetus.pdf
    • http://afrocubanforum.org/uploads/1/3/0/4/130483305/4c180a3e28.pdf
    • http://norwalkpainting.com/uploads/1/3/0/2/130272859/jiwavidesemujapev.pdf
    • http://lindsayscronin.com/uploads/1/3/0/9/130969386/9161263.pdf
    • http://tinyzootravels.com/uploads/1/3/0/4/130476908/femomogekexexajurok.pdf
    • http://atantiscatering.com/uploads/1/3/0/7/130740477/wujetaputedus.pdf
    • http://utahdivorceconsulting.com/uploads/1/3/1/4/131453393/muxewemajosuro_jokupi_wedevapuwitil.pdf
    • http://naturalnubians.com/uploads/1/3/1/4/131407867/3269cc18f9.pdf
    • http://elospy.com/uploads/1/3/0/9/130968935/0219ceee7d8e.pdf
    • http://mitchtroop.com/uploads/1/3/0/4/130435732/zotupepeta.pdf
    • http://carolandrich.com/uploads/1/3/1/0/131070334/lixakejasikori_vodiju.pdf
    • http://twinklifeglobal.com/uploads/1/3/0/3/130313783/ropoxurobilurus-jabekanafoj.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_off000092b8.bin
7642973004069c0d08d51c6567578f53952208102d1701462be3d27418f666bd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x92B8 9528 bytes

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