Malicious PDF — malware analysis report

Static analysis result for SHA-256 c666626f8f82bb2b…

MALICIOUS

PDF

69.7 KB Created: 2020-11-22 07:49:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: d977438406fa7db4b783402d411829c4 SHA-1: df7433bab6927aa2cb867fd1d973550b4543f397 SHA-256: c666626f8f82bb2b70f1462b5b07e5c60ff54db7afc518773168e45537ded603
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/123?utm_term=dense+irregular+connective+tissue+histology+diagram PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4419235/normal_5fa89bf024bc2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446272/normal_5fa21c537a6a8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391314/normal_5f8e043e517c7.pdfIn PDF document text
    • https://duzufeto.weebly.com/uploads/1/3/4/7/134734580/3934899.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419218/normal_5fa400f20e947.pdfIn PDF document text
    • https://jirumovovajunu.weebly.com/uploads/1/3/4/8/134899481/fuduto.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/lolijexejomak/las_vegas_raiders_2020_draft_picks.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5b4c8f56-19a5-448a-8397-4a4e4be33a9d/wovokafazigutuvu.pdfIn PDF document text
    • https://s3.amazonaws.com/baxegezivumi/20285934061.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ee3b8602-1491-44a5-a8fd-de5cdbf972ee/getesasejasaxilodomejilu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c20269f1-7dfb-416d-8654-b3a70aef37d3/xasok.pdfIn PDF document text
    • https://s3.amazonaws.com/jedaxopopuko/basetos.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/15843047-e33b-487c-bb28-8fc3ee272716/gititupisatutul.pdfIn PDF document text
    • https://s3.amazonaws.com/babuxufarizuxur/6691344568.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d220.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD220 5512 bytes
SHA-256: 96a5c8b480aaf9138f2474517bb2dff04a1fd9a43d9cc4ff539029e10b40cc8e
font_01_sfnt_off0000e4c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4C7 11104 bytes
SHA-256: f0a270b903f064f081c466109427456d1c7c905a1ed6831b7f9f4ea3bb550879

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