Malicious PDF — malware analysis report

Static analysis result for SHA-256 886a1c692b75a252…

MALICIOUS

PDF

85.9 KB Created: 2021-09-21 10:06:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: ac4e0c4ef368d10fc9dfdf0f1fa67f93 SHA-1: 886e842af265c7cc6d55b067cbb663cf44b665e6 SHA-256: 886a1c692b75a2520be67e579c5c9b59bb3ddea0b8d1f2b1926aec0a87cb21d8
126 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier indicating maliciousness. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates it is part of a link farm on disposable hosting, and numerous unknown URLs were extracted. The presence of external URIs suggests the document is intended to redirect the user to malicious sites, likely for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://wedding-box100.com/uploads/files/202109020437558617.pdf In PDF document text
    • https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/72so0qr7hngaed2bciqu4299tp2msum3/35371734986.pdfIn PDF document text
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161479e8308316---95600946903.pdfIn PDF document text
    • http://linyuepharm.com/upload/files/bururisilofo.pdfIn PDF document text
    • http://rtm-plus.com/ckfinder/userfiles/files/83453936543.pdfIn PDF document text
    • https://dodomacnosti.net/data/file/mulofive.pdfIn PDF document text
    • http://hunicorn.hu/userfiles/file/22444917207.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/161303f1027383---54743984691.pdfIn PDF document text
    • https://ladulceseguros.ar/noticias/fckeditor/file/92232049441.pdfIn PDF document text
    • http://babywagen24.de/userfiles/file/jumudo.pdfIn PDF document text
    • http://kpotplace.com/uploads/files/kekixuxodujomowugopof.pdfIn PDF document text
    • http://fresh-j.info/images/uploadedimages/file/92013721425.pdfIn PDF document text
    • http://fmi.lu/userfiles/files/vezotipuvedopukujomuli.pdfIn PDF document text
    • http://abwingscolley.com/uploads/files/rexuxupu.pdfIn PDF document text
    • http://dgelc.com/userfiles/file/20210908144657.pdfIn PDF document text
    • https://loffoxfitness.mvwebsolution.com/userfiles/files/junetoribawazigutafawef.pdfIn PDF document text
    • https://shiprapublication.com/uniformkontakt/userfiles/image/files/4952808453.pdfIn PDF document text
    • http://artio.pl/files/files/dimizenolusavaxepubugugo.pdfIn PDF document text
    • http://skipjackpoke.com/ckfinder/userfiles/files/69398282656.pdfIn PDF document text
    • https://www.stock2morrow.com/ckfinder/userfiles/files/89838180285.pdfIn PDF document text
    • http://dialog-seversk.ru/jsplugins/ckfinder/userfiles/files/79986099266.pdfIn PDF document text
    • http://cpviettin.com/upload/files/sidalozumabiwesubiwizidu.pdfIn PDF document text
    • http://hyundaihungthinh.com/uploads/images/files/gezulagubewu.pdfIn PDF document text
    • https://rdsdealers.com/ckfinder/userfiles/files/redunum.pdfIn PDF document text
    • https://tybistanbul.org/resimler/files/5718923696.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=making+android+iconsPDF 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_off0000e98d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE98D 18868 bytes
SHA-256: 60125c09e127a128f3f240dd14e6c1ecf0d82147ab4281e91114a7ae66d36fdf
font_01_sfnt_off00011a53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A53 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001326a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1326A 10352 bytes
SHA-256: e663440320ea23dc64a7676abf076ebcf6cfd1afec6ec169bd16d509c521c7d2