Malicious PDF — malware analysis report

Static analysis result for SHA-256 8cc22e431446a94b…

MALICIOUS

PDF

83.6 KB Created: 2021-09-13 20:33:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 343a392ab442f072fcae4fee0fa3be60 SHA-1: c34df2f280ac03c51e66529e8b210089353678b3 SHA-256: 8cc22e431446a94b5ba0fff89b79c28fc8e968b3d45d54b04a7bd43f9c9cf3f4
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by multiple heuristics, including a high-confidence ML classifier and ClamAV detection, indicating malicious intent. The presence of numerous external links, many pointing to disposable domains and disguised as PDF files, suggests a phishing or malware distribution scheme. The 'SE_DOWNLOAD_BUTTON' heuristic further supports the lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://medvor.ru/uplcv?utm_term=abtalk+mod+apk+download PDF link annotation
    • http://needychild.org/ckfinder/userfiles/files/dofopamevipuvasotexew.pdfIn PDF document text
    • http://polipadel.com/userfiles/file/58546834132.pdfIn PDF document text
    • http://thekitchendesignstudio.org/uploads/files/12692321589.pdfIn PDF document text
    • http://pk.mo/userfiles/file/98703572871.pdfIn PDF document text
    • https://kubermatkaplay.com/ckfinder/userfiles/files/wevikuz.pdfIn PDF document text
    • http://zeshengtecphar.com/UploadFiles/FCKeditor/20210913035346.pdfIn PDF document text
    • http://3wsystems.com/shipinc/userfiles/files/95553774255.pdfIn PDF document text
    • http://alles-vom-schreiner.de/userfiles/file/87427336578.pdfIn PDF document text
    • https://bunianco.com/other_files/File/57012055884.pdfIn PDF document text
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f15e8b04d8---gaxegafagixesavafa.pdfIn PDF document text
    • https://altaitur.com/ckfinder/userfiles/files/bulirakavonupox.pdfIn PDF document text
    • https://www.weboonline.com/ckfinder/userfiles/files/39120594853.pdfIn PDF document text
    • http://kmconlinecme.com/userfiles/file/jezejizoxemosomavaba.pdfIn PDF document text
    • https://drakbera.com/ckeditor/ckfinder/userfiles/files/24830399510.pdfIn PDF document text
    • http://wadirumshootingstars.com/userfiles/file///modarojezemof.pdfIn PDF document text
    • http://itineraire-consulting.com/ckfinder/userfiles/files/54569235814.pdfIn PDF document text
    • https://eastmanllc.com/ckfinder/userfiles/files/jobobinepurifupovalu.pdfIn PDF document text
    • http://sql110.com/pic/66527831365.pdfIn PDF document text
    • http://thueotodn.com/uploads/image/files/74864161319.pdfIn PDF document text
    • http://investbuild.ru/var/upload/file/xuraxefeno.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://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_off0000e08b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE08B 19108 bytes
SHA-256: 38f0529875f7f76467b84dba261fa5207284c8d6e2002715e85406ffd6783ef8
font_01_sfnt_off0001119b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1119B 10360 bytes
SHA-256: 068631ffef3851d2c26ee1ac93ac2ce542244864a449a0926c481d630094812c
font_02_sfnt_off000128d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128D7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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