Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc622f8812790676…

MALICIOUS

PDF

70.3 KB Created: 2020-11-09 17:34:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: d3a9a89a447e787139ed872b6ddd2dc8 SHA-1: d1aaedcd17f8b358dbe096da63e6deff08c9c17f SHA-256: fc622f8812790676a7ae5c1d2bfc34aa3f8fea8dab8b1704f89dbfe2ef77c91c
194 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

The PDF file contains a heuristic firing for a fake CAPTCHA, indicating a social engineering attempt to trick the user. It also links to a known malicious redirector URL, suggesting it's part of a phishing or malware distribution chain. The ML classifier strongly flagged this PDF as malicious, and ClamAV detected it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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.
  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • 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://traffmen.ru/123?keyword=trial+1875+ffxi In PDF document text
    • https://cdn-cms.f-static.net/uploads/4423166/normal_5fa784fc75b3a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387938/normal_5fa7b44e5f626.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368218/normal_5f8e5c8670777.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372987/normal_5fa0ec3f60841.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369322/normal_5f91d680c6817.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/4273a73b-47e7-43b5-abab-92f3cb714507/who_me_in_sign_language.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/09eb7992-9ddc-45b9-bf2f-56d786d4faf3/nixojabenisi.pdfIn PDF document text
    • https://s3.amazonaws.com/xovajukoxin/felufisu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/da0e95c2-5a5d-4653-be84-7f430dcfe9c9/zisivi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2050acfa-963a-4cdc-9a17-f6865042a3c3/butigisafopisa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/30bcb686-8570-4b01-ad34-aa4ccefb41f7/rilusesagalupi.pdfIn PDF document text
    • https://s3.amazonaws.com/poresi/dolitofabesekuzigudodisad.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ea49c0c1-39eb-41b5-8fe2-09831199bd6f/32109050371.pdfIn PDF document text
    • https://s3.amazonaws.com/remeranexe/corellon_larethian_dnd.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_off0000d35e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD35E 5048 bytes
SHA-256: 3fc58c64cdd39dde7284dfbe8aa9770d2ffff79fa1df9784731784856faa54aa
font_01_sfnt_off0000e4b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4B0 11888 bytes
SHA-256: b5ea3cfaf00ad1f518e553ac17c18cef09bf3dcb54ee76c6d0bcf917c24dfd8c

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