Malicious PDF — malware analysis report

Static analysis result for SHA-256 7e8b6d0ae5e98304…

MALICIOUS

PDF

89.8 KB Created: 2021-01-04 20:40:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: f94f4fd3b43588f7b30b7ac192025434 SHA-1: e10a26ab771e1cd8df28f4c567f10841e68e69dc SHA-256: 7e8b6d0ae5e98304acfd2091d937b249344b284c8ea6ea2f1012884a4070a53d
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing attempt. It contains a large number of external links, suggesting it's part of a link farm designed to direct users to potentially harmful websites. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic strongly support this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://traffking.ru/123?utm_term=hello+meaning+in+kinyarwanda PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4369919/normal_5f8a46597af33.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489722/normal_5fb9f70900f3e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393370/normal_5f92fdf0b8438.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4464530/normal_5fecff2e9c163.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369769/normal_5f917d907cb40.pdfIn PDF document text
    • https://cdn.sqhk.co/relulapezele/7QOhjjK/download_commander_battle_mod_apk_revdl.pdfIn PDF document text
    • https://nisivijuwowog.weebly.com/uploads/1/3/0/8/130813757/7c81c6daa63e.pdfIn PDF document text
    • https://xizukuzu.weebly.com/uploads/1/3/4/6/134606793/2c4b959b8e831.pdfIn PDF document text
    • https://cdn.sqhk.co/zotevokep/hihjAXi/75156249120.pdfIn PDF document text
    • https://cdn.sqhk.co/jabakujivim/joggHBj/kolizekokozurotata.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/fojaxexino/22610064436.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_off000119df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119DF 5184 bytes
SHA-256: 27d489300129f3fee46ee1ada2fc15f19f04ca30a086be2c0eb764e13c72db54
font_01_sfnt_off00012b7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B7F 15372 bytes
SHA-256: 76799ab6886209ef8a509992e297b59a0379c64673cc31ee772ea48f9adcd84c

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