Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4384b026fccfa06…

MALICIOUS

PDF

68.6 KB Created: 2020-11-30 17:51:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: dbdcce03164b65745113fc1ed5b96eb2 SHA-1: 968784a5e87bd3f6981efc8c90534002fc11a867 SHA-256: b4384b026fccfa0689f9f5d465980ef5ee894b5f228d1803fd960199992b9dae
156 Risk Score
Tags
free-cdn-ebook-manual-lure

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 0.9998

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://trafftec.ru/aws?utm_term=xamarin+android+splash+screen+center+image PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4379718/normal_5f9595a063302.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449605/normal_5fc256c49df26.pdfIn PDF document text
    • https://mitesevutij.weebly.com/uploads/1/3/4/7/134717039/pimok.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377116/normal_5fbc9c7da8047.pdfIn PDF document text
    • https://jitogomufe.weebly.com/uploads/1/3/4/5/134588764/bexeto-naxabu-ruvekixoja.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409826/normal_5f95d2a82629b.pdfIn PDF document text
    • https://kijatuvoriwoze.weebly.com/uploads/1/3/4/3/134352029/vivobebumomam.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366366/normal_5fa52d75eab1a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/fc01b308-4646-44b6-9bbd-ce69f266a87f/2345350794.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ed71dd99-0ed4-49b8-b46e-e9b6c23f896e/vigajelafimazade.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/25fc5f42-97ba-44bc-bed5-b16547c5b09c/dragon_world_cheats.pdfIn PDF document text
    • https://s3.amazonaws.com/metubevozisul/73793540102.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/54d5fb35-58fb-440a-b910-0a9aa8ef336e/vubipujeb.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3ac4cfe7-41fb-4476-9da2-204524deda98/deep_breathing_for_anxiety.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e0f93b0c-2088-475e-a778-d0dd1f59558b/73206369509.pdfIn 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_off0000cca5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCA5 5464 bytes
SHA-256: 13e443e14b6348c7862c61d0730a9898363e40f4e529f39e3e00facb97fc248b
font_01_sfnt_off0000df0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF0A 11244 bytes
SHA-256: 26cd08bc7160fcd252bd74b29cd4eddded828a2037c7afd641c4139f6fa9d341

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