Malicious PDF — malware analysis report

Static analysis result for SHA-256 df98cc7aa6f5eeca…

MALICIOUS

PDF

81.3 KB Created: 2021-09-10 18:11:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 31b866536406ce3807d15e912e7f6e0f SHA-1: 52786d512ded6559973e326c8421481d3bfcbea9 SHA-256: df98cc7aa6f5eeca7c1c5d22291813ffef57190493da28e03cd349ec9947e2bf
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URLs, indicating it is designed to redirect users to potentially malicious websites. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this by identifying the PDF as a link farm on disposable hosting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • 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.
  • 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://catamma.ru/uplcv?utm_term=action+game+best+mobile+games+2020 PDF link annotation
    • http://lifecare4all.com/upload/files/24786971706.pdfIn PDF document text
    • http://harringtonandlombardi.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/99660353491.pdfIn PDF document text
    • https://inprovitvenezuela.com/ckfinder/userfiles/files/bajikosuripu.pdfIn PDF document text
    • http://moretonassets.net/userfiles/75872359839.pdfIn PDF document text
    • http://kmconlinecme.com/userfiles/file/41127462557.pdfIn PDF document text
    • http://hissekurban.com/resimler/files/dizazuvesapos.pdfIn PDF document text
    • https://panelshock.com/userfiles/file/duwaroxofakojexenusiti.pdfIn PDF document text
    • http://rhondachem.com/d/files/wuguluvusexajobapojijana.pdfIn PDF document text
    • http://soosanfix.com/upload/fckeditor/file/dunupivakalakolewuk.pdfIn PDF document text
    • http://colokit.thienlonggroup.com/Images_upload/files/222201000.pdfIn PDF document text
    • http://cycling-software.com/files/file/nokarigesinewiwefidalig.pdfIn PDF document text
    • http://www.bc-arman.kz/ckfinder/userfiles/files/1849626700.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139477501ffb---15298207350.pdfIn PDF document text
    • https://agencement-menuiserie-var.fr/stockages/files/razobubogaguwewaras.pdfIn PDF document text
    • https://mcq-exambd.com/app/webroot/ckfinder/userfiles/files/nozivemozewodopebipatuli.pdfIn PDF document text
    • http://upoart.com/ckfinder/userfiles/files/38122533611.pdfIn PDF document text
    • http://soloparamideco.com/js/new/fckeditor/userfiles/file/81798081161.pdfIn PDF document text
    • http://ranfeng.com/userfiles/file/2021-9///202197347206547.pdfIn PDF document text
    • http://www.louisefarmersmith.com/admin/ckeditor/ckfinder/userfiles/files/danagez.pdfIn PDF document text
    • http://skomi.ru/img/files/file/91925212560.pdfIn PDF document text
    • https://fong-cai.com/upload/files/nenokawelewimexopujanuf.pdfIn PDF document text
    • http://phuvuongcorp.com/luutru/files/17456880310.pdfIn PDF document text
    • https://m-astar.com/UserFiles/files/fibexevunosefokav.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_off0000d83b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD83B 17528 bytes
SHA-256: 747b27696975ff68500f7e2842c7f850b5e39c2f34047b9bf3cbbb202d05cb48
font_01_sfnt_off00010622.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10622 10836 bytes
SHA-256: 020e74aaba30c00d354d293cd2da68daeb2039e12160986aedbed4744fe712e1
font_02_sfnt_off00011f38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F38 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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