Malicious PDF — malware analysis report

Static analysis result for SHA-256 768ae3df1df4cbb1…

MALICIOUS

PDF

72.8 KB Created: 2021-09-12 03:54:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: acd4340790fad5cd1db1657c15d36b6e SHA-1: 86ec865dc1b6737d013348ce2617834c1b9fa885 SHA-256: 768ae3df1df4cbb19df48b7ab261feefd0182957e92dd6ebfbc6e375a4c8a7fd
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 identified as a phishing trojan. The heuristic analysis indicates it functions as a link farm, with numerous embedded URLs pointing to potentially malicious content, including a deceptive link related to downloading a mobile game. The presence of external URIs and the overall structure suggest an attempt to trick users into downloading further malicious payloads.

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 https://eatorhours.org/e-bussiness/fckimages/file/40777910227.pdf In PDF document text
    • https://www.sensiblemachines.com/ckfinder/core/connector/php/files/katalopapunifakukigu.pdfIn PDF document text
    • http://twinmd.ru/userfiles/file/90367822905.pdfIn PDF document text
    • http://ciaomamma.hu/editor_up/44474892485.pdfIn PDF document text
    • https://juraganmonyet.com/contents/files/96155666397.pdfIn PDF document text
    • http://urs-certification.com/gais/image/file/81454368826.pdfIn PDF document text
    • https://olterus.net/contents/files/98067161631.pdfIn PDF document text
    • http://www.gpe-el.pro/ckfinder/userfiles/files/44422260801.pdfIn PDF document text
    • http://vector-mebel.ru/uploads/files/defanetofagizopo.pdfIn PDF document text
    • http://mezon.jp/userfiles/file/63853394366.pdfIn PDF document text
    • http://cnsgawefgl.netsociality.com/upload/files/19157133526.pdfIn PDF document text
    • http://mixmarketing.vn/upload/fck/file/nibonusoverusedidal.pdfIn PDF document text
    • http://skup-laptopow.com/wp-content/plugins/formcraft/file-upload/server/content/files/161354f797ef02---60466665205.pdfIn PDF document text
    • http://rileyillustration.com/images/agency/files/45802690521.pdfIn PDF document text
    • https://arabadvertise.com/userfiles/files/93301040044.pdfIn PDF document text
    • http://whdhgs.com/uploads/file/20210903220642742.pdfIn PDF document text
    • https://premium-house.uz/images/file/66582540023.pdfIn PDF document text
    • https://tmtteks.com/files/wojewusawibemi.pdfIn PDF document text
    • https://megashina24.ru/files/files/kapojaranutewodazibogur.pdfIn PDF document text
    • http://samuiluxurytravel.com/Uploads/file/59171721599.pdfIn PDF document text
    • http://solarexperte.ch/fckeditor/editor/images/file/92028250707.pdfIn PDF document text
    • http://chrisdepanneservices.fr/Sites/cds/files/vesopakazuleluranomumam.pdfIn PDF document text
    • http://makesrealsense.com/ckfinder/userfiles/files/gutuduweruvitimibefiza.pdfIn PDF document text
    • https://academiapreprod.riportico.com/userfiles/files/98711979928.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=download+ets2+mobile+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_off0000b7cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB7CC 10756 bytes
SHA-256: 3689f25c7f111466668644a3014e83e25de4847bc8207a3535664d4963971955
font_01_sfnt_off0000d09b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD09B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e8ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8AD 17248 bytes
SHA-256: 59f1f1deb3d3167fd92ee8bf33c8bbff71bbc7238610716b9c7417bedff9e166