Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8194ed833dbbe1f…

MALICIOUS

PDF

62.8 KB Created: 2020-12-27 22:37:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 3d263e41c160df35a82021c810097b32 SHA-1: 9368e9bba21c6f166d46f7b6c7401f6dd91e113c SHA-256: e8194ed833dbbe1fdb53e0e42f70903c6c418b8ce3925584694ad137b71de39b
156 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://trafficel.ru/strik?utm_term=instagram+video+downloader+apk+uptodown PDF link annotation
    • https://wubixuduliku.weebly.com/uploads/1/3/4/4/134466255/vejut.pdfIn PDF document text
    • https://jixobufasov.weebly.com/uploads/1/3/4/3/134324480/5455885.pdfIn PDF document text
    • https://vejegiraforid.weebly.com/uploads/1/3/4/3/134311029/1758515.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463306/normal_5fd893ce0d2e2.pdfIn PDF document text
    • https://cdn.sqhk.co/doxowite/2jipSDi/ascensia_contour_glucose_meter_manual.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405945/normal_5fab6b63dd23a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403820/normal_5fd9c729c799e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376105/normal_5fa65a9547de3.pdfIn PDF document text
    • https://jodonorinomudo.weebly.com/uploads/1/3/4/3/134316483/vorunibi-zifenawadir-fazupiv-lowel.pdfIn PDF document text
    • https://cdn.sqhk.co/peferitukofa/nmic8Em/megabus_nyc_to_albany.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bb0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB0C 5432 bytes
SHA-256: 48a0c783bd0942109e49c4a2de4d1e8fa0205153801d7e3fdda228bc7311cd34
font_01_sfnt_off0000cd8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD8A 9704 bytes
SHA-256: 9a4fc44064561640e16d845f6c0e4a17fffbf1218c29814bbdfa728b9abc62be