Malicious PDF — malware analysis report

Static analysis result for SHA-256 6702d2942c09b782…

MALICIOUS

PDF

96.5 KB Created: 2021-06-10 15:01:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3f0e41c998b8d728ad7df57aacc7296f SHA-1: dedd8a5ffd0dcbce9b1355e08da72aaf409d17b6 SHA-256: 6702d2942c09b7827f47defb35414c1cd975077e1256bf8838c1a31e296455fc
96 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a link farm, suggesting a tactic to manipulate search engine results or host malicious content. The ML classifier strongly indicated maliciousness, and the presence of embedded URIs further supports this. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a malicious document, likely delivered via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 https://jottigo.ru/123?utm_term=bugsplat+reporter+lol
    • https://tujilebofali.weebly.com/uploads/1/3/5/3/135398949/vekeneba.pdf
    • https://xafinuwexedigu.weebly.com/uploads/1/3/1/3/131379324/lavelubuleda-zuxije.pdf
    • https://cdn-cms.f-static.net/uploads/4500877/normal_600a57ee6d986.pdf
    • https://cdn-cms.f-static.net/uploads/4388046/normal_5fdb71a63ee2a.pdf
    • https://neranutedaxujaw.weebly.com/uploads/1/3/1/4/131407849/57dc1.pdf
    • https://bejixetixozivi.weebly.com/uploads/1/3/4/4/134499198/1724447.pdf
    • https://static.s123-cdn-static.com/uploads/4407983/normal_600919af39dff.pdf
    • https://gizepigonezes.weebly.com/uploads/1/3/4/9/134901759/c09a03f130f.pdf
    • https://noxerurivago.weebly.com/uploads/1/3/4/7/134767941/rufumarasinajo.pdf
    • https://cdn-cms.f-static.net/uploads/4459322/normal_60b9bd3fea8ac.pdf
    • https://cdn-cms.f-static.net/uploads/4500904/normal_6017b2d3024ed.pdf
    • https://xafadatez.weebly.com/uploads/1/3/4/4/134478609/tokazisiwelexididaz.pdf
    • https://wusedutewaxugag.weebly.com/uploads/1/3/1/4/131437839/9636148.pdf
    • https://wejakoguxi.weebly.com/uploads/1/3/4/3/134324676/4423623.pdf
    • https://kifowufowuvix.weebly.com/uploads/1/3/5/3/135392599/7270399.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/30358b13-1126-43bf-9c40-c50ce5151766/semezaneziwomukubopof.pdf
    • https://uploads.strikinglycdn.com/files/3883ea00-bdbd-4658-8a02-4219d34c8fde/how_much_to_replace_lg_v20_screen.pdf
    • https://uploads.strikinglycdn.com/files/6fb5dbb2-1a9e-4054-bd16-dd32abbce26d/how_do_you_set_a_casio_2747_watch.pdf
    • https://uploads.strikinglycdn.com/files/4a4d9cba-f431-4ff2-ad9c-00be72311cb4/how_much_is_a_used_bowflex_treadclimber.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012f6c.bin
745ef0333f4af99c267246a490daff6809054fba8210c8f92cadf9337611a5db		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12F6C 4764 bytes
font_01_sfnt_off00013fb9.bin
28a3dcd729c4c1830cc708ef3f9d67ff4dca71d1e680a832a1c5c7d047e30e6c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13FB9 11392 bytes
font_02_sfnt_off0001669e.bin
1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1669E 4324 bytes

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