Malicious PDF — malware analysis report

Static analysis result for SHA-256 523a6abff841d3d6…

MALICIOUS

PDF

63.7 KB Created: 2020-12-22 22:22:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 462630dc21f65d70429c049ce7b5efd8 SHA-1: 90a8e1d5bce78e671590f4f408cec88b117c8020 SHA-256: 523a6abff841d3d6d9717d68a3e85c9bb69fb26bac67cbd10c1caaf31f7a4d1e
214 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 and routes users through malicious redirector infrastructure. 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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://cctraff.ru/strik?utm_term=mlb+standings+espn+2018 In PDF document text
    • https://cdn-cms.f-static.net/uploads/4418587/normal_5fa7032ab8c68.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381543/normal_5fa2bddd7e563.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454982/normal_5fbb8eafa6650.pdfIn PDF document text
    • https://mazegiwekode.weebly.com/uploads/1/3/4/5/134529082/2ed9d32.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379377/normal_5f8cad9c60803.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4448121/normal_5fc987ced3c09.pdfIn PDF document text
    • https://punuvenow.weebly.com/uploads/1/3/4/4/134445800/petodanawe.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/1bcc05e5-9527-4468-8738-aa97572bd67d/tosow.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b4ab208e-7259-4199-a3f8-a147c4e86ce1/sidezanowitoji.pdfIn PDF document text
    • https://s3.amazonaws.com/nitirew/77437626631.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d6fe2f46-a40c-4b26-9ac1-ccce20f3ae37/bill_gates_net_worth_2001.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3f7f52d1-0abf-43bf-b3cd-4b3193864724/jufenetebapenezotikusobaf.pdfIn PDF document text
    • https://s3.amazonaws.com/vutame/kezeguwupot.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f2b65879-2c8a-492f-8b30-c95099016f43/50818229634.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000af9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF9B 5376 bytes
SHA-256: 03908cfbdf3347816171f43cedb34c94e56a1b83ca15f1267a84dbaa88c55d3a
font_01_sfnt_off0000c1ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1EC 9760 bytes
SHA-256: 5594a308cf648598f0a8773e1f58e80db5b8bfc8aa722ca0b33a4d786aa746b7
font_02_sfnt_off0000e297.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE297 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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