Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3ec6190c3dbd378…

MALICIOUS

PDF

72.0 KB Created: 2021-09-15 12:50:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 21149bea5c426b64fa0f5192d5e03181 SHA-1: f570ecc78921d8ac226c67d6e012fd46b2496c30 SHA-256: b3ec6190c3dbd37892b19661ff32ef5e741c266adad8139e53398fe6791c39f2
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to domains that appear to be part of a link farm designed to redirect users. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a high likelihood of malicious intent, aiming to obscure the final destination of the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://smidgel.ru/uplcv?utm_term=different+chest+muscles PDF link annotation
    • http://nickels.design/ckfinder/userfiles/files/35930750379.pdfIn PDF document text
    • http://nail-free.com/ckfinder/userfiles/files/78517472935.pdfIn PDF document text
    • http://tt-ural.su/admin/ckfinder/userfiles/files/79195433182.pdfIn PDF document text
    • http://glassick.com/userfiles/file/manaxunekex.pdfIn PDF document text
    • https://drosamahetta.com/userfiles/file/vefilivopo.pdfIn PDF document text
    • http://sciattella.net/images/file/danudijij.pdfIn PDF document text
    • http://hatowo.com/app/webroot/uploads/files/52643248478.pdfIn PDF document text
    • https://silky.ae/images/bulk_images/files/josovotozuwezoxudi.pdfIn PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16132c717b2663---tasokuxufujakipux.pdfIn PDF document text
    • https://cancelaria.pl/galeria/file/xebebazitam.pdfIn PDF document text
    • http://falconfam.com/ckfinder/userfiles/files/fuponid.pdfIn PDF document text
    • http://teamwork-poetschke.com/ckfinder/userfiles/files/zakamen.pdfIn PDF document text
    • http://cgl.lu/userfiles/files/44819064671.pdfIn PDF document text
    • http://youngthisyear.com/ckfinder/userfiles/files/9572515578.pdfIn PDF document text
    • http://malir-naterac.info/UserFiles/File/muvitezaxe.pdfIn PDF document text
    • https://nilsahost.com/calisma2/files/uploads/28392937459.pdfIn PDF document text
    • https://myvideoclasses.com/ci/userfiles/files/bofavo.pdfIn PDF document text
    • http://hndgyl.com/v15/Upload/file/20219388262458.pdfIn PDF document text
    • http://selidbe-beograd.info/files/26747909783.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1612f077874371---33619556670.pdfIn PDF document text
    • http://www.johnrealestate.in/ckeditor-ckfinder-integration/uploads/files/wufolo.pdfIn PDF document text
    • http://www.seminariomenorvalencia.com/admin/lib/ckfinder/userfiles/files/47133526933.pdfIn PDF document text
    • http://tortsurprise.ru/upload/redactor/files/bababepeloj.pdfIn PDF document text
    • http://sanfrancescovet.com/userfiles/files/fowunazipejomaxefivuwoxep.pdfIn PDF document text
    • http://www.rajpuc.pl/pics/file/66261755604.pdfIn PDF document text
    • https://zagorjeadventureteam.hr/files/68580100454.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_off0000b843.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB843 10420 bytes
SHA-256: 4a8e7cb023ea2d501e75b0b5f6eefa4ac1cce9152bb5935b0547746c64505759
font_01_sfnt_off0000cfb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFB1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e7c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7C3 16612 bytes
SHA-256: 0761308baa3b1f2f76166c496f75a5572ae37b534769f3a39c425fd8e502230c

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