Malicious PDF — malware analysis report

Static analysis result for SHA-256 20f00faff3610cbe…

MALICIOUS

PDF

77.1 KB Created: 2021-09-08 16:09:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 72ba099c8f82ebd8906e232030ade419 SHA-1: 1dadf9dedcda1c7b81038e8e0d5488c8871fd9a9 SHA-256: 20f00faff3610cbec43776da9f4d4391dc3182265c944d98d7c46c570ab4970f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to disposable hosting and appear to be part of a link farm designed to redirect users. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a high likelihood of this document being used to distribute malicious content or conduct phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://oniceh.ru/uplcv?utm_term=grocery+list+for+diabetics+pdf PDF link annotation
    • http://ahkjt.com/upfile/file/6603558652.pdfIn PDF document text
    • http://sys-svinding.dk/userfiles/file/kebunumidubexuwaduxava.pdfIn PDF document text
    • https://micsys.in/userfiles/file/gekolamigeputukivobu.pdfIn PDF document text
    • http://yonseri.org/userfiles/files/gidirijuze.pdfIn PDF document text
    • http://nontaromclinic.com/ckfinder/userfiles/files/94888563184.pdfIn PDF document text
    • https://medius.sk/userfiles/file/numujumifizere.pdfIn PDF document text
    • http://terezmisszio.eu/files/file/togulukok.pdfIn PDF document text
    • http://eshop-kocicinadeje.cz/files/file/87685097093.pdfIn PDF document text
    • https://goez1.com/10005001208290177/ckfinder/userfiles/files/noxutazidufebudukifisipi.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/16133ab0328bb7---salurudikubudojolajufa.pdfIn PDF document text
    • http://artikos.pl/userfiles/file/pijigavafavaxoxinejap.pdfIn PDF document text
    • https://livres-d-art.com/ckfinder/userfiles/files/12933665546.pdfIn PDF document text
    • http://www.vljainandco.com/userfiles/files/16076105969.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16138516c3bc1d---jajikisisixugisutak.pdfIn PDF document text
    • http://vitali-schulz-eiskunstlaufen.de/userfiles/files/5486310498.pdfIn PDF document text
    • http://kolaykanal.com/userfiles/files/37557976903.pdfIn PDF document text
    • https://www.cdsale.org.au/application/third_party/ckfinder/userfiles/files/29963149807.pdfIn PDF document text
    • https://mkontakt.pl/dat/file/najupube.pdfIn PDF document text
    • http://imdmotors.com/uploadfile/file/2021090309552478.pdfIn PDF document text
    • http://aibasavar.edu.bd/app/webroot/ckfinder/userfiles/files/42054556278.pdfIn PDF document text
    • http://montpellier-businessplan.com/mbp/upload/images/images/upload/ckfinder/35479903686.pdfIn PDF document text
    • http://furniture83.com/upload/files/60034596763.pdfIn PDF document text
    • http://cokhixnktientien.com/Images_upload/files/buwesegoredisaxi.pdfIn PDF document text
    • http://www.gieskestukadoors.nl/ckfinder/files/files/96892136131.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_off0000c937.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC937 17192 bytes
SHA-256: 162b13d1009a07c9ebaf07f547823a4e6acabb9dd75890c98c5437af5af3375c
font_01_sfnt_off0000f60e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF60E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010e25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E25 10800 bytes
SHA-256: 514fe6cace6de32133240b4ad152f0826d62a7d0d858714e591a9733004c1867