Malicious PDF — malware analysis report

Static analysis result for SHA-256 91cb93bbda0d08b3…

MALICIOUS

PDF

84.8 KB Created: 2021-05-30 09:03:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 67a633196fc4cb841d37204b86a7ec20 SHA-1: e4a6a3daff6bfaf1508e365be3525dd7a524062b SHA-256: 91cb93bbda0d08b36eba8bb5bd2f4aa34946cfa5acf5da7694de37412b548392
214 Risk Score

Malware Insights

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

This PDF file was flagged by multiple critical heuristics as malicious, including a redirector link and a PDF link farm. The embedded URLs suggest an attempt to redirect users to potentially harmful content or to engage in SEO manipulation. While no scripts were extracted, the presence of numerous external links indicates a phishing or malicious redirection attempt.

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.
  • 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://dafemum.ru/strik?utm_term=telugu+theme+music+ringtones+free+download In PDF document text
    • https://static.s123-cdn-static.com/uploads/4381997/normal_5ff3e1bd2e9cf.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4469370/normal_5fdeadb653312.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4503035/normal_5fee84ff93c2c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374181/normal_5fe65e7d1bf57.pdfIn PDF document text
    • https://futibiwis.weebly.com/uploads/1/3/1/4/131408183/8247191.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489264/normal_60382f3233269.pdfIn PDF document text
    • https://guwidavimup.weebly.com/uploads/1/3/4/8/134893931/jonotonisixisis-dakop-vukiv-gixazomatumul.pdfIn PDF document text
    • https://befofevaz.weebly.com/uploads/1/3/0/9/130969220/wuxuzuwer-babewajon-zoguzif-bupufivovoji.pdfIn PDF document text
    • https://vorexumezekadan.weebly.com/uploads/1/3/0/9/130969740/2804871.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372955/normal_601fe83e02f12.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414687/normal_606599812c7e1.pdfIn PDF document text
    • https://nusisudarebo.weebly.com/uploads/1/3/4/3/134349377/tiwekogejenurali.pdfIn PDF document text
    • https://fuvodaxe.weebly.com/uploads/1/3/1/3/131379021/6433743.pdfIn PDF document text
    • https://gibejuta.weebly.com/uploads/1/3/0/7/130776113/3337651.pdfIn PDF document text
    • https://waxuxugiw.weebly.com/uploads/1/3/5/3/135312989/zibuvomogokerum-ginesepi-lozeso.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426545/normal_5fe2f630a8ed6.pdfIn PDF document text
    • https://xulijijexam.weebly.com/uploads/1/3/1/4/131453336/kobisabizigo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409992/normal_6038b8e4ecc05.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/d7611ca5-dae6-477b-a3b8-5a17d5b2a87f/8500041132.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/239730a6-d4bd-40f7-93c0-46b85683b469/mutizumoferozukunowenu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4c98551c-735e-4f75-8832-bd6f2d9829ce/zegijazusebupatoz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/52573e48-b575-414e-8149-02fee69af362/lipuxurekexesitivosivezeb.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_off00010c31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C31 5476 bytes
SHA-256: d35a112cc1f445b50e9456952f3019e3bb420ef66c4d17150a3655c4ff206a8c
font_01_sfnt_off00011eb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EB7 10808 bytes
SHA-256: 2c51c9137c95a6ab1162f1e04b6477c92209ae9363e569044f96edf04bbc81d2

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