Malicious PDF — malware analysis report

Static analysis result for SHA-256 a79be37ea0ef6495…

MALICIOUS

PDF

71.1 KB Created: 2021-10-04 05:35:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 686c45ac33e7fae43f8092806153f789 SHA-1: 7bb617a498168572585f94df0a3af0d861a52e85 SHA-256: a79be37ea0ef64950de3c3cb452852758a161420e1ded8a67f69d5d30e27e65c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains a large number of embedded URLs, many of which point to disposable hosting or redirectors, indicating a likely attempt to distribute phishing content or malware. No scripts were extracted, but the overall structure and URL distribution strongly suggest a malicious intent to redirect users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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 https://pixomot.ru/uplcv?utm_term=2000+pop+music+quiz+questions+and+answers PDF link annotation
    • http://gerd-pollak.de/userfiles/file/muwirubap.pdfIn PDF document text
    • http://lncxjzxxw.com/upload_fck/file/2021-9-11/20210911010639133397.pdfIn PDF document text
    • http://tpt.taipei/asset/uploads/files/fejuvonunakuxudafitisi.pdfIn PDF document text
    • http://winkeleninzundert.nl/uploadimages/files/19792310694.pdfIn PDF document text
    • https://insp.biz/img/file/8229723078.pdfIn PDF document text
    • https://thehouseproduction.net/file/midirapebovidalezurataz.pdfIn PDF document text
    • https://magnettoptan.com/upload/ckfinder/files/57536918053.pdfIn PDF document text
    • http://marikitaberbagi.com/userfiles/file/vopida.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/16156a8c97b86e---57685659993.pdfIn PDF document text
    • https://beyondpins.com/calisma2/files/uploads/savizimometimuwutugapozom.pdfIn PDF document text
    • http://kapfenberger-schuetzenverein.at/userfiles/file/57431644502.pdfIn PDF document text
    • http://coimbra.hu/uploads/ckfinder/userfiles/files/29524817057.pdfIn PDF document text
    • https://szabobuszberles.hu/files/files/84241809126.pdfIn PDF document text
    • http://topspeed4wd.com/ckfinder/userfiles/files/megesirurujopixasovupo.pdfIn PDF document text
    • http://siddharpeedam.org/userfiles/file/In PDF document text
    • http://location-appartement-venise.com/italie_documents/files/lufizuzufi.pdfIn PDF document text
    • https://habibitours.com/ckfinder/userfiles/files/fenopadejip.pdfIn PDF document text
    • http://shepardinteriordesign.com/rw/upload/file/satatakurisu.pdfIn PDF document text
    • http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614c77562eed7---30050269138.pdfIn PDF document text
    • http://officegate.biz/admin/fck_upload/file/40101590791.pdfIn PDF document text
    • http://studiogiamberardino.it/userfiles/files/kegosajolanafa.pdfIn PDF document text
    • https://gonguyenkhoi.vn/upload/files/joxako.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_off0000b263.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB263 16964 bytes
SHA-256: 88dced69d6aa6597cfb0dc5c694701ca7708ca5d8c7b8e123ff45d0fb6f53acc
font_01_sfnt_off0000dd56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD56 11168 bytes
SHA-256: bc72b18b56c1b580344e8ae041f3c01768a74b94a4cd5e5631e4ae534dc75fe6
font_02_sfnt_off0000f75d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF75D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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