Malicious PDF — malware analysis report

Static analysis result for SHA-256 04431964c70c1220…

MALICIOUS

PDF

80.1 KB Created: 2021-10-06 05:49:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: d469bd70f23ef4bbb3e4555f0aebd38d SHA-1: 86b03d789a61a72fb4735ffefe4029da0fa30003 SHA-256: 04431964c70c1220ef90b471ffa7803fe489fa95adf6d6d93999cb9c14ea12cf
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to various domains, many of which appear to be disposable hosting for PDF files. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using multiple distinct hosts with a small number of links each, suggesting an attempt to obscure the true malicious intent or distribute payloads across many sites. No scripts were extracted, but the presence of numerous external URIs strongly suggests the document's purpose is to redirect the user to malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://inwebjor.ru/uplcv?utm_term=how+to+build+a+magic+deck PDF link annotation
    • https://kungfuclasshongkong.com/louis/taichi/ckfinder/userfiles/files/59502168432.pdfIn PDF document text
    • https://onlinendttraining.net/files/fowafefotunel.pdfIn PDF document text
    • https://xn--80aggmy8c6c.net/UserFiles/File/kukakesutanubixu.pdfIn PDF document text
    • https://bititechnika.com/uploads/file/sesarivitufajivosowuso.pdfIn PDF document text
    • http://siciny.eu/userfiles/file/82887275458.pdfIn PDF document text
    • http://familie-schiecke.de/images/file/22153898616.pdfIn PDF document text
    • http://kargiskola.ge/myadmin/ckeditor/ckfinder/userfiles/files/mipaso.pdfIn PDF document text
    • http://www.szphotar.com/admin/img/files/28285108366.pdfIn PDF document text
    • http://zulassungsservice4you.de/bilder/file/sodifus.pdfIn PDF document text
    • http://bilafafafa.com/shopadmin/upload/files/jipurewaja.pdfIn PDF document text
    • https://10s317.com/uploads/files/202109200550037781.pdfIn PDF document text
    • https://jagamimpi.info/contents/files/17876065684.pdfIn PDF document text
    • https://1tlstar.com/storage/uploads/files/rikofum.pdfIn PDF document text
    • http://regiapart.si/uporabnik/file/vipexazesebotiz.pdfIn PDF document text
    • http://nattuvaartha.com/assets/ckfinder/core/connector/php/uploads/files/59126642287.pdfIn PDF document text
    • http://arqing.es/ckfinder/userfiles/files/lobegitarewagepevaporima.pdfIn PDF document text
    • http://mfcwestenkwartier.nl/beta/userfiles/file/63367241242.pdfIn PDF document text
    • http://commandhousecreations.com/uploads/files/kumusimubemit.pdfIn PDF document text
    • http://www.farmaciavictoriayjmleon.com/userfiles/files/zuvifesupunivugegetu.pdfIn PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/161410d80d952b---75683865378.pdfIn PDF document text
    • https://gogreenonline.net/userfiles/image/fckeditor/file/gasusumizibovifone.pdfIn PDF document text
    • http://madmojo.com/fckupload/file/xuwigolepazugifawironov.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16158303d5c226---68155755522.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_off0000d2f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2F7 10748 bytes
SHA-256: 232d1739ab14f0f5bf3dc6d04630f8c794aa421ddc116ff63298c00c9b9f62b4
font_01_sfnt_off0000eb82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB82 18056 bytes
SHA-256: ba1b1e6d7a35cb948c9922d4e81c7a17afbcaabd5114ac78d80d7d748796dcb2
font_02_sfnt_off00011b0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B0F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1