Malicious PDF — malware analysis report

Static analysis result for SHA-256 37a659fa2e09087a…

MALICIOUS

PDF

85.0 KB Created: 2021-09-21 16:47:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 546a5a3043c02d46b030c7abc0a25e7f SHA-1: 30ce80b1c785e9c3c54942a57a14b7566fe8c253 SHA-256: 37a659fa2e09087ad486cec7570fc77869d73403c9384785d2a343b29a268e6d
214 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document exhibits characteristics of a payment redirection lure, aiming to trick users into updating their financial information. The presence of embedded JavaScript and numerous external links, many pointing to potentially malicious domains, suggests an attempt to download and execute further malicious content or redirect users to phishing sites. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • Payment redirection / bank-detail change lure high SE_PAYMENT_REDIRECT_LURE
    Document describes new or changed bank, wire, ACH, IBAN, SWIFT, or routing instructions — a high-value business-email-compromise pattern
  • 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://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613104d577c93---naxim.pdf In PDF document text
    • http://xn--hy1bt45apoap01a.net/jangheung/userfiles/file/65244760950.pdfIn PDF document text
    • http://ghinelliarchitettura.it/userfiles/files/busuxogezip.pdfIn PDF document text
    • http://80tner.netsociality.com/upload/files/xefor.pdfIn PDF document text
    • http://mashhadgardi724.ir/basefile/mashhadgardi724/files/36815045319.pdfIn PDF document text
    • http://arsvet.ru/img/upload/pezorababojikuwutexok.pdfIn PDF document text
    • http://konemara.hu/userfiles/file/tedozipasomujujaxumumaje.pdfIn PDF document text
    • http://cleanking.net/userData/board/file/wawotufezina.pdfIn PDF document text
    • http://chongros.com/userData/board/file/xofifimaganuvarejovixen.pdfIn PDF document text
    • http://soluzionebenessere.eu/userfiles/files/66124354406.pdfIn PDF document text
    • http://baohanhranghm.com/upload/img/files/23794151728.pdfIn PDF document text
    • http://kutscher-customs.de/gfx/userfiles/files/60305111235.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614111a16739e---73113641294.pdfIn PDF document text
    • https://alkathirilaw.com/userfiles/files/zukim.pdfIn PDF document text
    • http://hanasushi6.com/uploads/files/vejaworajox.pdfIn PDF document text
    • https://benmoonpharma.com/userfiles/file/supakuvobazut.pdfIn PDF document text
    • http://vuoncotichdep.com/upload/files/goramet.pdfIn PDF document text
    • http://sarljarry.fr/userfiles/file/22157677162.pdfIn PDF document text
    • http://asfalon.com/__files/file/zesulajujogixomasa.pdfIn PDF document text
    • https://pragatitic.org/ckfinder/userfiles/files/42334235722.pdfIn PDF document text
    • http://skyrun-arser.com/js/fckeditor/editor/filemanager/connectors/php/connector.php/upfiles/file/210914085157757618ulh1hk.pdfIn PDF document text
    • http://woori-tour.kr/FileData/ckfinder/files/20210918_ADEC35871A11BEAA.pdfIn PDF document text
    • https://indianhairtransplant.com/ckfinder/userfiles/files/bifolawudubuxajosobogekug.pdfIn PDF document text
    • https://marjoyunlar.com/calisma2/files/uploads/19888289736.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=zane+fortnite+accountsPDF link annotation
    • http://pro.ovh.net/~tribuene/images/banque/file/fiziz.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_off0000dceb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCEB 21740 bytes
SHA-256: f7a1cdd09c967fd8b77c3fd7a9f9aa7c4dc2458e8ee1040c70c1315b0d02a07f
font_01_sfnt_off000116af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116AF 10348 bytes
SHA-256: 0d045088fca47d413877266c35a08693f101975c91661ecc6efb55bfc565a165
font_02_sfnt_off00012e41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E41 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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