Malicious PDF — malware analysis report

Static analysis result for SHA-256 82b360f212ae0001…

MALICIOUS

PDF

71.4 KB Created: 2021-09-26 11:45:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 0c38538f31741947a64ddcb47dce73df SHA-1: e879cf8aaa07d7e16c208abc8374cfeedaf8f2c9 SHA-256: 82b360f212ae000118b7ea7bd55966e49210e0bfaaf62ba8081d6ef2bed260fc
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 that point to various domains, many of which are likely part of a link farm designed to obscure the final destination. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests a malicious intent to redirect users, potentially for phishing or malware downloads. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://vinczeandlaszlo.com/upload/15505360341.pdf In PDF document text
    • http://mehmetrasimmutlu.com/icerik/file/55218744761.pdfIn PDF document text
    • http://jonme.net/ckupload/files/87739627219.pdfIn PDF document text
    • http://cottoneauto.it/userfiles/files/vuxabuwofavibe.pdfIn PDF document text
    • https://galerieportelouise.be/userfiles/files/25243551893.pdfIn PDF document text
    • https://aronabritcan.com/userfiles/file/paxotuzilibag.pdfIn PDF document text
    • https://orsam.org.tr/paketler/ckfinder/dosyalar/files/72693198955.pdfIn PDF document text
    • https://nacionalequipamentos.com/ckeditor/uploads/files/pipaderefedezupijoge.pdfIn PDF document text
    • http://brushes.tfe-design.dk/userfiles/file/gowilixapufurotidiz.pdfIn PDF document text
    • http://alpes-maritimes.proximeo.com/ckfinder/userfiles/files/49023714864.pdfIn PDF document text
    • https://0a3exp.com/upfiles/editor/files/vidufadegenulagerewiwiwiz.pdfIn PDF document text
    • https://manorhair.com/uploads/files/202109112047124742.pdfIn PDF document text
    • http://nhakhoanhantin.com/media/ftp/file/lenavedezalizebelinujone.pdfIn PDF document text
    • http://veganogle.es/uploads/ckfinder/files/53350356144.pdfIn PDF document text
    • https://distriparkbotlek.nl/userfiles/files/nazawaso.pdfIn PDF document text
    • http://engineersclasses4competition.com/files/others/serafexekupove.pdfIn PDF document text
    • http://asea-admin.com/_userfiles/file/20210906045354.pdfIn PDF document text
    • http://phuketdriveschool.com/userfiles/file/62892063486.pdfIn PDF document text
    • http://reversetheclocknow.com/ckfinder/userfiles/files/susexorefewaguguda.pdfIn PDF document text
    • http://clinicaveterinariasangiacomo.it/userfiles/files/jolutuwelokeze.pdfIn PDF document text
    • https://bdlvn.com/steel/upload/files/mijameza.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=super+mario+bros+nintendo+entertainment+system+nes+romPDF 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_off0000ae96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE96 10936 bytes
SHA-256: 72c7ef7ee248943187944c2c64d3c30fe80ff65486b28d3278c0ae5ce2abaec3
font_01_sfnt_off0000c7b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7B6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000dfc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFC8 18632 bytes
SHA-256: e43f3ccd3777315b38b40eb2116930059dc5d4fc17c8702409befebbf9de9b92

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