Malicious PDF — malware analysis report

Static analysis result for SHA-256 46a340df4bf575b4…

MALICIOUS

PDF

44.3 KB Created: 2020-04-05 10:06:48 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 98d751f4a04ddce7dcd79785d131e0f1 SHA-1: 7d50adbed2693b39e0079af3f86786b9f361e47f SHA-256: 46a340df4bf575b4b1cbea39d0d590d3eb6b8f4fd6d5720f4d4c3428d5ebde0b
92 Risk Score

Malware Insights

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

The PDF contains a large number of external links to other PDF files hosted on various domains, indicating a link farm or content distribution network. The ML classifier strongly flagged this PDF as malicious. The primary attack pattern involves directing users to these external resources, likely for SEO manipulation or to serve additional malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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
  • 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://showamongfriends.com/uploads/1/3/0/8/130874146/130874146.html#nitrogeno+elemento+quimico+valencia
    • http://southfloridafarmers.com/uploads/1/3/0/2/130273753/be2df24daf185.pdf
    • http://elizabethmackintosh.com/uploads/1/3/1/3/131380341/2934970.pdf
    • http://graceplacecalvary.org/uploads/1/3/0/5/130540182/702999.pdf
    • http://daughterredeemed.org/uploads/1/3/0/2/130289749/vapogekibima.pdf
    • http://aventerreecole.com/uploads/1/3/0/5/130539021/merabokivenelome.pdf
    • http://premiumsa.net/uploads/1/3/0/5/130540725/5932d6987791c2.pdf
    • http://vacationrentalsinternational.net/uploads/1/3/0/5/130588282/9498478.pdf
    • http://ridgefieldpioneervillage.com/uploads/1/3/0/6/130620776/kewimipuni.pdf
    • http://bearfruitsbaskets.com/uploads/1/3/1/3/131383580/gazizejekewilo.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_off00007618.bin
8643f6aea8059476f72f2bf30f8a7f5c59de8293a37bf447ba658054db23fb13		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7618 9576 bytes
font_01_sfnt_off000098ad.bin
e2f1373bf3d70a40ff4276a486f0a1d2d32154e4f45ad1243a44c3d3b7d91cea		 pdf-font-stream PDF embedded font (sfnt) at offset 0x98AD 2652 bytes

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