Malicious PDF — malware analysis report

Static analysis result for SHA-256 cdec070aff0187dd…

MALICIOUS

PDF

83.9 KB Created: 2021-09-20 22:01:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 2a4208a0bd644dd145bd055f8e3e8b16 SHA-1: 83cdf21a30bf897f9633abcc69a5568d4d73ad6b SHA-256: cdec070aff0187dd2a1923df43dd42afb66282a7fb4801a831b65350f080779d
174 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ClamAV and an ML classifier. It contains embedded JavaScript and numerous links to external websites, many of which are hosted on disposable domains, indicating a link farm designed to distribute malicious content or phish users. The presence of embedded JavaScript suggests an attempt to execute code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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 http://hostingureitings.lv/uploads/userfiles/files/58981756308.pdf In PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/161461fb558493---68523697476.pdfIn PDF document text
    • http://sure2trips.com/bot/ckfinder/uf/files/95250421967.pdfIn PDF document text
    • https://bienenaktuell.com/sites/bienenaktuell.com/files/file/samotoraki.pdfIn PDF document text
    • http://www.stadion-zarya.ru/ckfinder/userfiles/files/48257415188.pdfIn PDF document text
    • http://www.idukkidiocese.org/files/js/ckfinder/userfiles/files/xosiworojatizu.pdfIn PDF document text
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137e4d67ee15---gomepamaxivinudumolabezoz.pdfIn PDF document text
    • http://bobmeetin.com/media/galleries/files/rugaji.pdfIn PDF document text
    • http://oasishs.com/uploads/files/20210913_144312.pdfIn PDF document text
    • http://clinicaveterinariagoitese.it/userfiles/files/38215206449.pdfIn PDF document text
    • https://tybistanbul.org/resimler/files/likupobibedo.pdfIn PDF document text
    • http://www.dogwoodagility.nl/ckfinder/userfiles/files/kuvamusijowik.pdfIn PDF document text
    • https://kaktutzhit.by/uploads/files/67634638325.pdfIn PDF document text
    • https://parlagame.net/calisma2/files/uploads/96153136010.pdfIn PDF document text
    • https://www.weboonline.com/ckfinder/userfiles/files/xokerudenizojikefidusegu.pdfIn PDF document text
    • https://glaze-metalart.com/upload/files/21837027986.pdfIn PDF document text
    • http://www.museopizarra.com/ckfinder/userfiles/files/doripixota.pdfIn PDF document text
    • https://agatanorek.com/files/file/80146024625.pdfIn PDF document text
    • http://casaperferiesantamariagoretti.com/writable/public/userfiles/file/84463358340.pdfIn PDF document text
    • http://carraracucinecomponibilitrapani.it/userfiles/files/2875300514.pdfIn PDF document text
    • https://kitapkapla.com/upload/ckfinder/files/84546037056.pdfIn PDF document text
    • http://pizzeria-millemiglia.de/app/webroot/img/editor/file/75910174221.pdfIn PDF document text
    • http://ilkjv.com/Images/Media/files/dizajutopefuwevomutepog.pdfIn PDF document text
    • https://envida-nieuws.nl/bsb_website/upload_fck/file/23953750950.pdfIn PDF document text
    • http://fusiongrup.ro/userfiles/file/kakesapakogajevetegifor.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=tubemate+free+download+2019PDF 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_off0000e386.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE386 17400 bytes
SHA-256: e87c5bb6e26a39cfadea7fcd988ba3e3213066e71ad521642325d5b3fec728b3
font_01_sfnt_off000110a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110A2 11008 bytes
SHA-256: 2b9552ebfb45c4d3215e09fef23573f28bd68c379bac9cc9047cc1bd3e517ac4
font_02_sfnt_off00012a56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A56 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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