Malicious PDF — malware analysis report

Static analysis result for SHA-256 75fca5f385714e1f…

MALICIOUS

PDF

74.6 KB Created: 2021-09-21 02:34:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: e3ca233585e9fe675faf3b55e314cf52 SHA-1: ac8cd47aef47c50d4bca1a3e72966c4c0280a619 SHA-256: 75fca5f385714e1f28bb1d6ddc1c62ad7c156845a5c02be3a194ade93a312cc3
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are hosted on suspicious domains and appear to be part of a link farm, indicating a phishing or redirection attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a malicious document, likely used as a lure for initial access.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 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.
  • 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 http://www.mmd.ntou.edu.tw/ckfinder/userfiles/files/42627606515.pdf In PDF document text
    • http://elandtour.com/FileData/ckfinder/files/20210907_51C53793E26B72A2.pdfIn PDF document text
    • http://hanifeugur.com/image/files/60350637387.pdfIn PDF document text
    • http://wahluenfty.com/userfiles/sezenor.pdfIn PDF document text
    • https://implant-drill.com/userfiles/file/zidakadodudeti.pdfIn PDF document text
    • https://vico-real-estate.com/ckfinder/userfiles/files/60929830618.pdfIn PDF document text
    • http://gzcil.com/uploadfile/files/mugudizezutelepodax.pdfIn PDF document text
    • http://dooroc.com/tk/upload/file/85324744031.pdfIn PDF document text
    • http://tecnoservizi.com/userfiles/files/valiwisarumerid.pdfIn PDF document text
    • http://danangsculpture.com/uploads/image/files/89574123688.pdfIn PDF document text
    • http://shopcloud.cloud/ckfinder/userfiles/files/sixumadapikajavirodat.pdfIn PDF document text
    • http://hophungvietnam.com/app/webroot/uploads/files/86924886330.pdfIn PDF document text
    • https://www.clinicaepilepsia.cl/ckfinder/userfiles/files/dolusatafezisosoz.pdfIn PDF document text
    • http://dreambeauty.kr/upload/fckeditor/file/45088760017.pdfIn PDF document text
    • http://first-group.kr/ckupload/files/woledid.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/1613c12cf30cfc---mibafepafewofeg.pdfIn PDF document text
    • http://lovec.bg/root/ckfinder/userfiles/files/51908739604.pdfIn PDF document text
    • https://karatenarrewarren.com.au/ckfinder/userfiles/files/22453205627.pdfIn PDF document text
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/koi893vqlu1p4jdg8utppa4en4/wixizedurixutaduk.pdfIn PDF document text
    • http://mcap.cz/images/uploadedimages/file/vukexipazodogaz.pdfIn PDF document text
    • http://sieuthimaynhapkhau.com/upload/files/74019235254.pdfIn PDF document text
    • http://akinmedikal.com/uploads/file/77142894146.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=keranirakaladum+song+download+123musiqPDF link annotation
    • 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_off0000bd29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD29 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d540.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD540 11252 bytes
SHA-256: 84823c30f2809422e4e730c637a0f415c425317c6b784d94c0d718f840c760bd
font_02_sfnt_off0000ef3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF3B 17388 bytes
SHA-256: 0589886b0afdd91cf67926cd71081edfb28d87c951e080906fdea88dab6c905c

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