Malicious PDF — malware analysis report

Static analysis result for SHA-256 208e7ee74d75edef…

MALICIOUS

PDF

81.8 KB Created: 2021-09-18 05:22:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 17f2bc4dcbcc67d741af705bd362f4b2 SHA-1: 42f32ca3ce8cbf908e181f34ab9949a5edf3b8d1 SHA-256: 208e7ee74d75edefe8894f6a75a2621f08946cfe916dd464e7e021b04dcb9d60
126 Risk Score

Malware Insights

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

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to PDF files on various domains, indicating a link farm or distribution network. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests the intent is to manipulate search engine results or redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://topliving.sk/userfiles/file/14460570684.pdf In PDF document text
    • https://beautydent.hu/editor_up/66812680974.pdfIn PDF document text
    • http://myxroad.net/upload/userfiles/file///27461120718.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131fdaa1becd---17796493829.pdfIn PDF document text
    • http://sicompk.com/survey/userfiles/files/80919619938.pdfIn PDF document text
    • http://giasuthienphuc.com/Images_upload/files/viwotowugewexawu.pdfIn PDF document text
    • https://sarna-zapiekanki.pl/ckfinder/userfiles/files/13047436730.pdfIn PDF document text
    • http://jaqalsports.com/files/file/xekumotuvedovonenorukol.pdfIn PDF document text
    • http://koreaticketland.com/userfile/file/96308398775.pdfIn PDF document text
    • http://alkanboya.com/files/file///petolubugimeli.pdfIn PDF document text
    • http://szpital-sulecin.pl/images/fckfiles/file/savatujetelidat.pdfIn PDF document text
    • http://kursadowicz.pl/Upload/file/73200668622.pdfIn PDF document text
    • http://pensjonatagat.pl/userfiles/file/wonukilupofatewegibetisu.pdfIn PDF document text
    • http://smartdeal.pl/files/upload/files/91547613113.pdfIn PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/46d0589a2c066c329291d557c7fd1d82/dejisexixijipog.pdfIn PDF document text
    • http://studioboscono.it/userfiles/files/63764430458.pdfIn PDF document text
    • http://twtime.com/uploads/files/202109180106371595.pdfIn PDF document text
    • https://francoisdaulte.com/ckfinder/userfiles/files/kuxumivokubabefuzapis.pdfIn PDF document text
    • http://dulichtantai.com/files/uploaded/files/44672135124.pdfIn PDF document text
    • http://shepardinteriordesign.com/rw/upload/file/gawubomopunamakugutise.pdfIn PDF document text
    • http://www.accessibilite-salle-eau.com/ckfinder/userfiles/files/rekugog.pdfIn PDF document text
    • http://assisdrive.pt/userfiles/file/47146379592.pdfIn PDF document text
    • http://kukubara.com/zdjecia/file/pajubij.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=sound+live+wallpaper+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_off0000d8c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8C4 10444 bytes
SHA-256: 5420f9722ef38701fdaa2490cec8aac55cba1b8dcb42626c2466d6fcfe36de2a
font_01_sfnt_off0000f09d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF09D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000108af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108AF 18920 bytes
SHA-256: 8a6a6db329b49b7b109bbd3bc2e49d0349d71e60a468e4d1d7250c8c1cdcb2fb

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