Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f19731815fdddac…

MALICIOUS

PDF

81.8 KB Created: 2021-09-20 05:13:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: f86e1d0256b862b334003aae29e48bbb SHA-1: 29f4d6f91b4aea9002906608c9945d65b77a2110 SHA-256: 3f19731815fdddac5c20f8fd2ffd33383f7a7b886619784439ae09a0fde914fd
166 Risk Score

Malware Insights

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

The sample is a PDF document flagged by ML classifiers and ClamAV as malicious. Heuristics indicate it functions as a payment redirection lure, aiming to trick users into believing there are new banking instructions. The document contains numerous embedded URLs, many of which point to disposable or suspicious domains, suggesting a link farm designed to obscure the ultimate destination. While no scripts were explicitly extracted, the nature of the PDF and the presence of embedded URLs strongly suggest an attempt to exploit vulnerabilities or redirect users to a phishing or credential harvesting site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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
  • 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.
  • 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://sudeoksa.net/userfiles/file/20210913230427.pdf In PDF document text
    • https://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/1dfrvhgr7is1vbp28kmlv2hplf/86405137248.pdfIn PDF document text
    • https://olterus.org/contents/files/ruwewozixebumodi.pdfIn PDF document text
    • http://maristaslardero.es/userfiles/file/92702407146.pdfIn PDF document text
    • http://bentleyplemtech.ru/userfiles/file/nadukobemagiri.pdfIn PDF document text
    • http://odontotecnicacoop.it/userfiles/file/98360501453.pdfIn PDF document text
    • http://domosplast.hu/files/file/novifexuw.pdfIn PDF document text
    • http://banquat.com/userfiles/files/gidebajazi.pdfIn PDF document text
    • http://zovsh.com/Uploadfiles/files/9307293267.pdfIn PDF document text
    • http://kesherisrael.com/uploadEditor/files/64023276003.pdfIn PDF document text
    • https://zhavezbozi.cz/data/file/63075738617.pdfIn PDF document text
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/161351c8265f5e---80446783743.pdfIn PDF document text
    • http://health-bridge.in/upload/file/libebewifufogog.pdfIn PDF document text
    • http://parcroyale.hk/userfiles/50451567364.pdfIn PDF document text
    • https://wemservice.com/ckfinder/userfiles/files/53968304791.pdfIn PDF document text
    • http://manisafar.com/basefile/marcosafarir/files/93547910372.pdfIn PDF document text
    • https://esprimagroup.com/userfiles/file/72682648663.pdfIn PDF document text
    • https://www.domaine-vrignaud.com/ckfinder/userfiles/files/zepujul.pdfIn PDF document text
    • https://www.leadercaravans.com.au/application/third_party/ckfinder/userfiles/files/pumodewija.pdfIn PDF document text
    • http://didula.ru/img/file/29457497892.pdfIn PDF document text
    • http://cuacongtudongbinhduong.com/upload/files/1366748300.pdfIn PDF document text
    • https://urbanlivin.lu/userfiles/files/vikenaridagoxulusilus.pdfIn PDF document text
    • http://1hozain.ru/files/userfiles/files/dopususofinuxijatinabibip.pdfIn PDF document text
    • http://canadianrockies.ca/files/file/26007294294.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=contacts+not+transferring+from+android+to+iphonePDF 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_off0000daa1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAA1 11052 bytes
SHA-256: 5757dca5607ed1bfa721da2bbd582db1f6a72c64c9aaea876530246fbd5973ba
font_01_sfnt_off0000f408.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF408 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010c1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C1A 17396 bytes
SHA-256: ee28f3ddc935504a4f79962b3273f4147138f4d9bae90b4e7dceb4ddca992ac8