Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a8a135cb47b8a94…

MALICIOUS

PDF

89.7 KB Created: 2021-09-19 12:55:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 84a9b0a2931373a965952208a3b92a8c SHA-1: 56f6c53bb6938e180cd1afbe34f3b399b18f0594 SHA-256: 7a8a135cb47b8a94894167d7daf3c045f24bf19f3a2f18b061b5f0b193603d0f
166 Risk Score

Malware Insights

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

The sample is a PDF file flagged by ML classifiers and ClamAV as malicious, specifically identified as a phishing trojan. Heuristics indicate it functions as a link farm on disposable hosting, with a high-risk lure related to payment redirection or bank detail changes. The embedded URLs likely lead to further malicious content or phishing sites, aiming to trick users into downloading malicious files or divulging sensitive information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 https://smidgel.ru/uplcv?utm_term=sprint+unlock+free+apk PDF link annotation
    • https://cargotavio.ru/files/file/9124947557.pdfIn PDF document text
    • http://newbusan.net/FileData/ckfinder/files/20210909_667EEDAE4350418A.pdfIn PDF document text
    • http://turhantur.com/turhantur/files/lesiwubesenejudaf.pdfIn PDF document text
    • https://andrejc.si/files/file/tuliwagefabajijojujadul.pdfIn PDF document text
    • http://hkbroadwin.com/userfiles/84128954587.pdfIn PDF document text
    • https://twinslock.com/ckfinder/userfiles/files/duwikatekuzisefal.pdfIn PDF document text
    • http://yourbuilding.ru/userfiles/files/54842450325.pdfIn PDF document text
    • http://www.vljainandco.com/userfiles/files/11258245215.pdfIn PDF document text
    • http://www.taimaobi.com/admin/ckfinder/userfiles/files/59759702008.pdfIn PDF document text
    • https://yellowstonewildlife.com/sonipaputizan.pdfIn PDF document text
    • http://sluchatka-shop.cz/files/upload/files/wefuxadibatesawosanal.pdfIn PDF document text
    • https://novamakine.com/upload/ckfinder/files/paboxidif.pdfIn PDF document text
    • https://artistprasanna.com/userfiles/file/7277086491.pdfIn PDF document text
    • https://proxus.nl/file/56537914883.pdfIn PDF document text
    • http://wonsakai.com/uploads/files/67469165721.pdfIn PDF document text
    • http://www.cavice.fi/tiedostot/files/femolopo.pdfIn PDF document text
    • http://hyunsin.net/userfiles/file/baxijixupizusep.pdfIn PDF document text
    • https://bepcongnghiepphuchung.vn/userfiles/file/93781698357.pdfIn PDF document text
    • https://www.servicespace.org/inc/ckfinder/userfiles/files/nomafipejibo.pdfIn PDF document text
    • http://asvpp.fr/pdf/63920776004.pdfIn PDF document text
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/176bca59d0849f1f90c993c22e3bb391/pukumupa.pdfIn PDF document text
    • http://vizcsap.hu/files/file/sugozigonubijo.pdfIn PDF document text
    • http://suarezbeltran.com/aym_images/files/mixotesiwomiziba.pdfIn PDF document text
    • http://sunway.me/uploads/file/16160551135.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_off0000f1f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1F2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010a04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A04 20724 bytes
SHA-256: 4a67ce15b3499ae22a6c262a75c4ad1556953dde52d07038b897a71ba8ccd40c
font_02_sfnt_off00014131.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14131 10572 bytes
SHA-256: 5715d1c6682b508d69a806842de80a9ab4b5574702f6e02b58e9e2c349e2b770

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