Malicious PDF — malware analysis report

Static analysis result for SHA-256 4392ae9265c330a7…

MALICIOUS

PDF

70.0 KB Created: 2020-11-21 09:04:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 5dbfbd51e485100125a846b69ac32744 SHA-1: 1613854e0643755dabef2b57f8b5714860c743c6 SHA-256: 4392ae9265c330a7604597ca9de4ab989d67f4fe33dca73acc071426eec66e0d
184 Risk Score

Malware Insights

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

This PDF file is identified as malicious by multiple heuristics and an ML classifier, including critical alerts for malicious redirector links and ClamAV detection. The embedded links, such as 'https://gettraff.ru/wb?keyword=eine%20kleine%20nachtmusik%20mozart%20sheet%20music', point to known malicious infrastructure. The document's structure and embedded links suggest an attempt to phish or redirect users to harmful content, likely as part of a broader malicious campaign.

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 is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://gettraff.ru/wb?keyword=eine%20kleine%20nachtmusik%20mozart%20sheet%20music In PDF document text
    • https://tekegalesi.weebly.com/uploads/1/3/0/7/130740489/liledexix-junakelepexugu-mukomeda.pdfIn PDF document text
    • https://tamalokumolegi.weebly.com/uploads/1/3/4/6/134656593/9536340.pdfIn PDF document text
    • https://sigakoge.weebly.com/uploads/1/3/4/4/134437147/e4e36836471c7.pdfIn PDF document text
    • https://petavigavixate.weebly.com/uploads/1/3/4/4/134459614/1484425.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379046/normal_5f956444bb5ee.pdfIn PDF document text
    • https://panirosarukiza.weebly.com/uploads/1/3/4/1/134132539/nupotevemif.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/votuweroxigezog/free_audio_books_s_for_android.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c745dec5-71b3-4517-9384-060c6b42722f/97834041756.pdfIn PDF document text
    • https://s3.amazonaws.com/susopuzupure/core_connections_geometry_book.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5aa59cdc-0ef5-4286-82be-481d20edd6f5/vray_for_revit_2017_crack_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/42fb82dd-f806-46e7-bd3b-4c692e1d2e04/58414701503.pdfIn PDF document text
    • https://s3.amazonaws.com/nevovumowa/44845893015.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bf22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF22 5108 bytes
SHA-256: 3c1f1335043e90eab56bc53f837513a44a62940929e5d5dee813a6667ba77f2d
font_01_sfnt_off0000d062.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD062 11392 bytes
SHA-256: 98d77261377a699a6466bd79b3aecc7dad56776221c338733c2aa087174099f0
font_02_sfnt_off0000f5e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5E4 16184 bytes
SHA-256: 75e56e6dc913dabd8b3c9cd5ea70025aeab0fff598b2ab24d9d660aeb9535195

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