Malicious PDF — malware analysis report

Static analysis result for SHA-256 e3987683b388ac53…

MALICIOUS

PDF

80.6 KB Created: 2021-02-18 17:45:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 87c66c52744cb3e88ff43ce9540ba023 SHA-1: 294bc76aada5da4039828da64d7a219d1443e8ed SHA-256: e3987683b388ac53ecfb86e049aadce821fa56a2db2fb08f41346b27de0837e7
96 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains an embedded URL pointing to a domain associated with phishing, disguised as information about osteoarthritis. The PDF structure and embedded content suggest it's designed to trick users into visiting the malicious link.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://maypoin.ru/strik?utm_term=what+is+ac+joint+osteoarthritis PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4410027/normal_6009793b5a182.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4447278/normal_5fc72f473d7f3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408878/normal_600a4322d5f64.pdfIn PDF document text
    • http://biggymstoe.com/fezexinean333.pdfIn PDF document text
    • http://lnstagram-help-businesss.com/18676411236fcqgt.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4468551/normal_60040e977bcea.pdfIn PDF document text
    • https://cdn.sqhk.co/sixitigoxeto/V5Wgjhh/tevezo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489429/normal_5fe849cbdf850.pdfIn PDF document text
    • https://zutomivopisi.weebly.com/uploads/1/3/6/0/136051870/33cb11417e7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475588/normal_601720e3b78d9.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://s3.amazonaws.com/pibabopuduj/24572836080.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_off0000f21c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF21C 4732 bytes
SHA-256: 1163802d352b842ba953fac8996492f190891bcbfa0f8ecafbc898934b8683ea
font_01_sfnt_off0001021f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1021F 10544 bytes
SHA-256: 1428b97abc28dae482e67088ff43cb525ba8b6b1309bcb05fc4f48f65ef883c9
font_02_sfnt_off0001264f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1264F 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378