Malicious PDF — malware analysis report

Static analysis result for SHA-256 82428fc89df8c238…

MALICIOUS

PDF

81.2 KB Created: 2021-09-09 16:35:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 2dfa5ebc85006d0d4ba7e0151715a57d SHA-1: f34a8733115b5d23cb773a6f4ce5f20125971b56 SHA-256: 82428fc89df8c238819aaea41995248ef6bbfd9b46f0a2e5ff25ee6f151e98a2
166 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. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' indicates the document likely instructs the user to open a password-protected archive, a common tactic to bypass gateway security. While no scripts were directly extracted, the presence of embedded URLs and the overall detection suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://pezenasenchantee.fr/userfiles/file/nedopadi.pdf In PDF document text
    • https://dveropolis.ru/upload_picture/vesivusepoz.pdfIn PDF document text
    • http://bkht.vn/userfiles/file/sagakedaxopisi.pdfIn PDF document text
    • https://jagamimpi.com/contents/files/60334716458.pdfIn PDF document text
    • http://sanruou.com/app/webroot/uploads/files/9499748602.pdfIn PDF document text
    • http://bapassamarinda.id/assets/ckfinder/core/connector/php/uploads/files/rasad.pdfIn PDF document text
    • http://gongotour.com/FileData/ckfinder/files/20210908_55E9DD3A04A46464.pdfIn PDF document text
    • http://pedraferro.com/files/files/18574336983.pdfIn PDF document text
    • https://safecampus.in/cmsCart/upload/file/lugufexosarakix.pdfIn PDF document text
    • http://a-swiss.com/upload/userfiles/file/neluzekonuxafezifub.pdfIn PDF document text
    • http://makinsushi.com/uploads/files/jidigofigipowax.pdfIn PDF document text
    • http://www.libroparlatolions.it/backoffice/ckfinder/userfiles/files/92157102272.pdfIn PDF document text
    • http://pyramidplaster.com/file_media/file_image/file/77801915571.pdfIn PDF document text
    • http://whkmradio.com/userfiles/file/77662524743.pdfIn PDF document text
    • http://elazentrale.de/images/uploaded/file/gaxopunebaz.pdfIn PDF document text
    • http://www.alfapilates.pl/upload/file/30833083474.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/161372e53c55e1---rironubizato.pdfIn PDF document text
    • http://yaqeen-eg.com/userfiles/file/60974323536.pdfIn PDF document text
    • http://xn--eyt274i.com/upload/files/juxawovefawesowu.pdfIn PDF document text
    • https://lanhcongnghiepthinhphat.com/upload/files/domebafalazajudi.pdfIn PDF document text
    • https://hurghadalife.net/userfiles/files/jamazasad.pdfIn PDF document text
    • http://munnarteabungalows.com/userfiles/file/82717759452.pdfIn PDF document text
    • https://mabuksusu.com/contents/files/banolikabopusuvevobudorix.pdfIn PDF document text
    • https://alquimia.in/admin/fckeditor/editorfile/wivogepejumefekej.pdfIn PDF document text
    • http://ttfi.org/app/webroot/userfiles/file/75311802005.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=real+es+file+explorerPDF 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_off0000d7d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7D7 18416 bytes
SHA-256: fc14d9ba4c66c32453c847d6f202a174537ba8ec498a76e63eb3c0d9b628f5e3
font_01_sfnt_off000107ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107EF 10296 bytes
SHA-256: ea823e5083d3c6fcfc303e39fee541ca5162e17a32b47e87ae17596df9d72343
font_02_sfnt_off00011f3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F3C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1