Malicious PDF — malware analysis report

Static analysis result for SHA-256 098440b1ab74906d…

MALICIOUS

PDF

84.3 KB Created: 2021-09-20 20:28:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0621ce52300896cb9ffea1f0c870ec50 SHA-1: 4d68f22c28f6f9b00cbbd5a49c8c752b5d4c8fe0 SHA-256: 098440b1ab74906d402711ef65c699111998b3e8e9003db53126f06afdc0d744
134 Risk Score

Malware Insights

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

The sample was flagged by ML and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to various domains, suggesting a link farm designed to redirect users to potentially harmful content. The PDF's structure and the presence of multiple external links indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://archism.ru/uplcv?utm_term=news+12+apk+for+firestick
    • https://accesoriosalmayor.com/images/userfiles/file/baligi.pdf
    • http://thietkewebbacninh.com/webroot/img/files/jewuvawa.pdf
    • http://linhkienhunganh.vn/luutru/files/10997704387.pdf
    • http://faurerom.com/userfiles/file/gepulasigejajuz.pdf
    • http://ageofwonders.buka.ru/sadm_files/juvewebomesitu.pdf
    • http://studioghittigargnano.com/userfiles/files/pazujafetewutaw.pdf
    • https://www.assofmt.org/ckfinder/userfiles/files/38390171452.pdf
    • http://jnejendomsdrift.dk/userfiles/file/60701701327.pdf
    • https://grdr.org/paidel/ckfinder/userfiles/files/duxupajajavaxuxekejimuwil.pdf
    • https://atlas-consulting.ro/fckeditor/fisiere/file/23269536594.pdf
    • http://enovosti.info/ckfinder/userfiles/files/kuwozebenuwelilave.pdf
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/16131b2f16c4a2---xajozupujidov.pdf
    • http://mytrangroup.com/uploads/userfiles/file/80194160372.pdf
    • http://tlw.ro/UserFiles/file/27393410065.pdf
    • http://xn----7sbev0bhje.xn--p1ai/images/news/file/jowikunepipoxotopanijeder.pdf
    • http://rdasesores.gestconcursal.com/editor/ckfinder/userfiles/files/45782816306.pdf
    • http://goref.ru/files/file/kuzexagumofafejagozopewot.pdf
    • http://domoticasociale.it/immaginiNewsletter/file/41437938668.pdf
    • http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/26fc6eacb42070349c9ce2d90b1f25c2/ratusixomoziviwakobu.pdf
    • https://christianbelieversmatrimony.com/web/christiansbelieversmatrimony/photos/ckeditor/files/65486093072.pdf
    • https://aykutemlak.com/upload/ckfinder/files/21059601842.pdf
    • https://paroles-vives.com/ckfinder/userfiles/files/3106649153.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e45a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE45A 16792 bytes
font_01_sfnt_off0000fc71.bin
84970193b98f5124b018536a8217711c582fb1c799527f806eb706f3d61de92b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFC71 10648 bytes
font_02_sfnt_off00011536.bin
059c32e50581166b1bec6e74d566c2616a9b11081e3c4a757a47b4220d7569a7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11536 18120 bytes

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