Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c97c690049b7504…

MALICIOUS

PDF

81.7 KB Created: 2021-09-09 12:06:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: e970a266a3d044f963f44dd8ad3509b3 SHA-1: a3a1dff1ab36c4253a14b6473082c0c13fad0192 SHA-256: 8c97c690049b75046f6652d49ce2a6f9f479119b59ffb7c2a0ecab3290ffa5e7
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are associated with link farms and disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing lure, likely attempting to trick users into downloading further malware or visiting malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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 https://gamedunyasi.com/calisma2/files/uploads/84700343672.pdf In PDF document text
    • http://geomanteia.com/userfiles/files/80030076433.pdfIn PDF document text
    • http://wefocusdesign.com/upload/files/narewuj.pdfIn PDF document text
    • http://rtm-plus.ru/ckfinder/userfiles/files/48590160659.pdfIn PDF document text
    • http://wonikquartz.com/upload/editor/file/1631073809.pdfIn PDF document text
    • http://umhouses.com/uploads/files/rupawexuvesoropomexiju.pdfIn PDF document text
    • https://ptogel1.com/contents/files/23315758521.pdfIn PDF document text
    • https://ntc-container.com/upload/files/wojofibopob.pdfIn PDF document text
    • https://www.kadeavenue.com/wp-content/plugins/super-forms/uploads/php/files/fb0b9df9c43cc37842949a27f310a9e7/65912095926.pdfIn PDF document text
    • http://adgroup.co/userfiles/file/wadalegobupesigimadupit.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16131343c6507b---foxoxa.pdfIn PDF document text
    • https://techson-cctv.com/upload/file/12567145735.pdfIn PDF document text
    • http://qualityfirstservices.pro/testingsites/advantage_aviation/assets/media/file/riberofuzezutefajewoj.pdfIn PDF document text
    • http://hosungtour.com/FileData/ckfinder/files/20210902_30DC3FA5EE4F3D89.pdfIn PDF document text
    • https://jbdclothiers.net/emailer/userfiles/file/5911478374.pdfIn PDF document text
    • https://armagedonspedycja.pl/files/file/6079240329.pdfIn PDF document text
    • https://asiantms.com/ckfinder/userfiles/files/64478588076.pdfIn PDF document text
    • http://slabowidzacy.smprzemysl.pl/ckfinder/userfiles/files/pebatazuzobufimanezepepip.pdfIn PDF document text
    • https://puntodeplacer.com/userfiles/file/78668601811.pdfIn PDF document text
    • http://2016.letnifestiwal.pl/ckfinder/userfiles/files/mubobuxubarezewepepelo.pdfIn PDF document text
    • http://swhos.com/upload/files/31715384871.pdfIn PDF document text
    • http://jedwines.com/cmsCart/upload/file/43081672313.pdfIn PDF document text
    • https://www.wemservice.com/ckfinder/userfiles/files/rekitadozalinusexilorof.pdfIn PDF document text
    • http://transporteslaplata.com/imagenes_web/file/88500132507.pdfIn PDF document text
    • http://unipsyclinic.com/userfiles/file/20210907074726.pdfIn PDF document text
    • http://otworz-biuro-podrozy.pl/userfiles/file/91011677093.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=gta+5+lite+game+download+for+androidPDF 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_off0000dadd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDADD 17528 bytes
SHA-256: 24b9da8ae800d3e4676ac4b084770b2e3b5b0cee55ba9fad544408d135de651a
font_01_sfnt_off0001081b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1081B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012032.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12032 10788 bytes
SHA-256: 82f982fc450a6f9d17ae044c193c6e36053126adb29313969ee75adc69a1d459