Malicious PDF — malware analysis report

Static analysis result for SHA-256 61a54badb5507320…

MALICIOUS

PDF

86.8 KB Created: 2021-09-18 14:10:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 8d812c83fb2477cb81818c90bdad44ae SHA-1: a8de11382187bd2b41c5d8bd562055dc96ec4feb SHA-256: 61a54badb5507320f38452856e499911211da0d5c7b9a0b3b699acd4df6eca76
174 Risk Score

Malware Insights

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

The sample is a PDF file containing embedded JavaScript, which is a common technique for executing malicious code. The PDF also contains numerous external links, many of which point to other PDF files, suggesting a link farm or downloader infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to download and execute a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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://panhongbo.com/ckfinder/userfiles/site_eachfun_com/files/73064401824.pdf In PDF document text
    • https://www.habitat-morvan.fr/ckfinder/userfiles/files/90494683860.pdfIn PDF document text
    • https://insp.biz/img/file/rovubewila.pdfIn PDF document text
    • http://romengo.com/ckfinder/userfiles/files/9871377164.pdfIn PDF document text
    • http://interel-rus.ru/test/sites/default/files/file/fesunetumimeviguxukelam.pdfIn PDF document text
    • http://esangsok.com/upfile/files/koleronulorubidakatapumir.pdfIn PDF document text
    • http://dennehylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/60055146750.pdfIn PDF document text
    • https://pachetedeturism.ro/images/files/53773652580.pdfIn PDF document text
    • http://tanabuauto.com/js/upload/files/16234663894.pdfIn PDF document text
    • http://pune-india.info/userfiles/file/35102425377.pdfIn PDF document text
    • https://delphin-restaurant.com/ckfinder/upload/files/sesixizuworedet.pdfIn PDF document text
    • https://altstudio.be/app/webroot/uploads/file/30628226259.pdfIn PDF document text
    • http://lucidarepavimentimarmogenovaealessandria.it/userfiles/files/ximatejud.pdfIn PDF document text
    • https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/3f625f1baced0faf22143931b04b78af/65817664848.pdfIn PDF document text
    • http://rucodelniza.ru/userfiles/file/56951964171.pdfIn PDF document text
    • https://confeccionesruiz.cl/UserFiles/File/dukoze.pdfIn PDF document text
    • http://rs-entp.com/upload/file/14559696176.pdfIn PDF document text
    • http://ambulatorioveterinariosantanna.eu/userfiles/files/gabixelefus.pdfIn PDF document text
    • http://jobcred.com/rk/jobcred/uploads/image/file/mokimibakuvebuxe.pdfIn PDF document text
    • https://tectrongim.com/uploads/files/luzozawakidubusifefej.pdfIn PDF document text
    • https://sukaunited4d.vip/contents/files/nusanutopavosi.pdfIn PDF document text
    • https://crbz.ru/userfiles/file/95184693134.pdfIn PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613af3c55eec2---polanasijorabuzuxi.pdfIn PDF document text
    • http://tomboy2.com/images/library/File/74336226137.pdfIn PDF document text
    • http://beiwendq.com/data/attachment/file/37593819307.pdfIn PDF document text
    • http://koszyczarek.pl/userfiles/file/32971755955.pdfIn PDF document text
    • https://mama-light.net/business_school/uploads/file/fokazovugekepojerawi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=free+funny+ringtone+apps+for+androidPDF 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_off0000ef56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF56 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010768.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10768 17332 bytes
SHA-256: e5026cd75b17b3cb125f844ed6d2e93ef52fed93559a60d5dfd957716171a063
font_02_sfnt_off0001340c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1340C 10816 bytes
SHA-256: cf8d1d5b484aabde131d84d6a9021f6f6a05e999dd960d1ece01a6da8fc236e1

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