Malicious PDF — malware analysis report

Static analysis result for SHA-256 1132650b4764de16…

MALICIOUS

PDF

60.3 KB Created: 2020-05-22 19:12:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c35c1b61861385a8b765c24c5b2531c2 SHA-1: 21f9453dc8f10f7a0002f687d750a46c933ea9d0 SHA-256: 1132650b4764de164de924ad2abb72936f7de0e10a81491fe5dd08d9fa532562
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 malicious SEO or content distribution scheme. The ML classifier strongly flagged this PDF as malicious. While no scripts were explicitly extracted, the PDF structure and embedded URLs indicate an attempt to redirect users to potentially harmful content hosted across numerous domains.

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://business-card.anyball.info/uploads/1/3/1/4/131453897/131453897.html#the+forest+caves
    • http://donlagreca.com/uploads/1/3/0/3/130313504/razixebik-suxalij-sovosevupaji-maresejen.pdf
    • http://cleanespacediffusionplus.com/uploads/1/3/0/6/130605422/7543492.pdf
    • http://buybuyama.com/uploads/1/3/0/3/130313166/fawilinogugivixara.pdf
    • http://dinizfamily.com/uploads/1/3/1/4/131407008/zotugo.pdf
    • http://baytodayrealty.com/uploads/1/3/1/4/131437726/jiwariru.pdf
    • http://anndonnell.com/uploads/1/3/1/6/131606253/rukipiwerum.pdf
    • http://laurasbatmitzvah.com/uploads/1/3/0/7/130739427/sikogi_goxinivogu_xumovawo_nasari.pdf
    • http://upbeetnaturalmarket.com/uploads/1/3/0/7/130740026/guganebezobadujonugi.pdf
    • http://aaadesigns1.com/uploads/1/3/1/3/131379591/vuvexedifezopa.pdf
    • http://taxfirmsolutions.com/uploads/1/3/1/6/131606491/3390356.pdf
    • http://fameuschocolate.com/uploads/1/3/0/7/130775643/tuxagubudajaf.pdf
    • http://littlegrandventures-store.com/uploads/1/3/1/3/131398521/eb5db6d5b9.pdf
    • http://healtohealproductions.com/uploads/1/3/1/4/131408529/tumabagakegas.pdf
    • http://faymfestival.com/uploads/1/3/0/8/130874281/makowavir.pdf
    • http://myinvestmentestate.com/uploads/1/3/0/6/130621063/86d9c56688ad.pdf
    • http://esbeesignsystems.com/uploads/1/3/0/4/130436162/90ec92cad09.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c1e1.bin
3c1f832bcb4847206c9f2a61608d77b090c7d872374fe5934054940674bccf97		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC1E1 10412 bytes

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