Malicious PDF — malware analysis report

Static analysis result for SHA-256 e526133b9983e14d…

MALICIOUS

PDF

90.0 KB Created: 2021-09-12 11:58:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 33192bd3c7a5898447d4ab90f60f24f7 SHA-1: 713b7ee8069146ee648258315b8f8ed8ff789138 SHA-256: e526133b9983e14d0e196789d03ec56535e8eb4af52537692bb68a82097ddf7b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs pointing to a link farm hosted on disposable domains, a common tactic for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and the presence of external links suggest it may exploit PDF vulnerabilities or redirect users to malicious content, potentially involving JavaScript execution.

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://manhalhealing.com/userfiles/file/11173008035.pdf In PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139ce9d4c73e---bepinoverusaxefaminal.pdfIn PDF document text
    • http://www.laterveer-biesenbeek.nl/ckfinder/userfiles/files/fimosira.pdfIn PDF document text
    • http://maremania.net/img_pagine/file/buvonuximowepetetesilafit.pdfIn PDF document text
    • http://globalfeedindustry.com/upload/files/5900563873.pdfIn PDF document text
    • https://nk-sostanj.si/files/file/66888658050.pdfIn PDF document text
    • http://a1-automotivegroup.com/upload/files/goderaluridasipepavamadan.pdfIn PDF document text
    • http://keralastatetailorsassociation.com/userfiles/file/gosoriwerujowel.pdfIn PDF document text
    • http://www.abcklima.hu/data/editorfile/mujimo.pdfIn PDF document text
    • http://www.tecnotrefg.it/wp-content/plugins/formcraft/file-upload/server/content/files/16134602c259d9---24782933431.pdfIn PDF document text
    • http://piri-piri.pl/ckfinder/userfiles/files/27447399772.pdfIn PDF document text
    • http://vanillasky-ch.com/images/files/5061658059.pdfIn PDF document text
    • http://ranjitabiswas.com/userfiles/files/nizupepipiwumirediv.pdfIn PDF document text
    • http://paneldeconsos.com/userfiles/file/bupujeli.pdfIn PDF document text
    • http://psychologyforeverybody.com/ckfinder/userfiles/files/makudilixevugukizarijiju.pdfIn PDF document text
    • http://www.oneworldkarate.com/fckeditorimages/userfiles/file/favufisavazinitolitupava.pdfIn PDF document text
    • http://mmprogetti.it/userfiles/files/53036235515.pdfIn PDF document text
    • http://felixefontesadvogados.com.br/ckfinder/userfiles/files/temaxidukivesarides.pdfIn PDF document text
    • https://ijaetis.org/ckfinder/userfiles/files/81503373929.pdfIn PDF document text
    • https://hijaustabilo.com/contents/files/48967476443.pdfIn PDF document text
    • http://dcbestwings.com/uploads/files/kipazom.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=the+walking+dead+streaming+servicesPDF 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_off0000faba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFABA 10904 bytes
SHA-256: fdf7036fadc7f55111846f13d5b423cce2c0a313f07615a2b471de64b0cf48a1
font_01_sfnt_off000113a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113A2 17844 bytes
SHA-256: f2606d8605be6799b1381b5da445ae600d2ff35cf23f6492dd3c9fe2147384b8
font_02_sfnt_off0001427a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1427A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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