Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f1ad85c8ba72464…

MALICIOUS

PDF

83.6 KB Created: 2021-09-14 14:03:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-27
MD5: e6868c40f0f96e9dd7f7f1d1c714201b SHA-1: 615eee93c2042717695fa8d50bb50931c75448bd SHA-256: 7f1ad85c8ba72464375db4eb50c3581ee23aaa64c8bfab02eb371fca49b40fc3
174 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URLs, indicating it's designed to redirect users to malicious content. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic strongly suggests the document's purpose is to trick users into believing they need to download a password-protected archive, which is a common tactic for delivering malware while bypassing gateway security. The ML classifier and ClamAV detection further confirm its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://synerhu.ru/uplcv?utm_term=instube+para+descargar+musica+y+videos PDF link annotation
    • http://www.temaricerca.com/entry2013new/admindia/ckfinder/userfiles/files/42066031157.pdfIn PDF document text
    • https://krzczonowice.pl/gfx/file/941459119.pdfIn PDF document text
    • https://badrivishal.com/media/64920529028.pdfIn PDF document text
    • https://computerzone.pk/file/84173698968.pdfIn PDF document text
    • https://akemi.ro/hirek/file/61963573874.pdfIn PDF document text
    • http://allefrgycg.news-read.com/upload/files/xopotunotudovajogo.pdfIn PDF document text
    • https://textosl.com/upload/editor/file/55143719753.pdfIn PDF document text
    • https://mysmartedu.com/uploadimages/files/dezejigiwefa.pdfIn PDF document text
    • http://robertoantoniz.com/resources/original/file/31754476713.pdfIn PDF document text
    • http://kanalizace-ul.cz/userfiles/file/23971827981.pdfIn PDF document text
    • http://flapboxes.custompackageboxes.com/userfiles/files/ziguvu.pdfIn PDF document text
    • http://www.farmaciapenil.es/userfiles/files/wofiniviluteganoruk.pdfIn PDF document text
    • http://freetourscadiz.com/ckfinder/userfiles/files/97167594253.pdfIn PDF document text
    • http://scea.edu.mn/ckfinder/userfiles/files/12580078588.pdfIn PDF document text
    • http://jubangh.com/Upload/FckUpload/20210901file///39281214816.pdfIn PDF document text
    • https://ambalatender.com/upload/files/guxigexubugemetebewaguva.pdfIn PDF document text
    • http://karinameal.ru/imgdish/files/84217205041.pdfIn PDF document text
    • https://free-spirit-city.eu/uploads/wysiwyg/files/zegokaramiganoluxoxakinit.pdfIn PDF document text
    • http://itnetworkconsultingsf.com/helpdesk/app/webroot/img/userfiles/files/sadude.pdfIn PDF document text
    • https://inprovitcentroamerica.com/ckfinder/userfiles/files/56834061600.pdfIn PDF document text
    • https://salondumariagededijon.com/userfiles/file/22509755175.pdfIn PDF document text
    • http://vertex-decor.com/userfiles/file/budazozamatajobakunuxeji.pdfIn PDF document text
    • https://reaga.net/js/ckfinder/userfiles/files/66353146756.pdfIn PDF document text
    • http://theheavent.com/userfiles/files/polapepakaboludazavetonin.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_off0000db82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB82 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f399.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF399 11184 bytes
SHA-256: f715e10785aeda3651c4b98c6da370a79548fd40d3ec8276c9c5215baf1a452e
font_02_sfnt_off00010d60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D60 19568 bytes
SHA-256: 918284c171590134b792e08e9692976546b24dada5cb06776b24021a2883aa33