Malicious PDF — malware analysis report

Static analysis result for SHA-256 97c1bdaa99a24e30…

MALICIOUS

PDF

84.2 KB Created: 2021-09-22 13:30:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: c7b57bebd919a5b3eaff77e6d7d40cf7 SHA-1: 07b40e625d2200c1bb4883e293771eec23ad7537 SHA-256: 97c1bdaa99a24e30c3eb9af465aaea3ee9db81f0f33bb18213545e30a0bebce6
174 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

This PDF file was flagged by ML classifiers and ClamAV as malicious, exhibiting characteristics of a social engineering attack (ClickFix). The embedded JavaScript and numerous external links, many pointing to PDF files on potentially disposable hosting, suggest an attempt to lure the user into downloading further malicious content or visiting phishing sites. The document body, though obfuscated, contains indications of wkhtmltopdf usage, and the SE_CLICKFIX heuristic confirms the intent to trick the user into executing commands.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • ClickFix social engineering attack high SE_CLICKFIX
    Document instructs the user to press Win+R or paste a command into a terminal — consistent with ClickFix attacks that bypass macro restrictions by tricking users into running malicious commands directly
  • 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 http://merrygoldholidays.com/ckfinder/userfiles/files/95419472074.pdf In PDF document text
    • http://faithleader.org/js/ckfinder/userfiles/files/zujor.pdfIn PDF document text
    • https://ctyhoanongangiang.com/userfiles/file/84663488074.pdfIn PDF document text
    • https://eternalbliss.net/file/notevosomatosizilizodu.pdfIn PDF document text
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f3c64b5b5a---zomabevufofen.pdfIn PDF document text
    • https://tarzminder.com/resimler/files/dakekeruviguzoralodotute.pdfIn PDF document text
    • http://kkagro.com/media/images/upload/file/ruzanawafafivasa.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16132e0687498b---xosezumodalatejekero.pdfIn PDF document text
    • https://pellevah.com/upload/files/ziribaduxajogubazagisoj.pdfIn PDF document text
    • https://totounited.com/contents/files/5462651045.pdfIn PDF document text
    • http://signexpowholesale.com/project-new/christianbook/upload_images/file/bolerajale.pdfIn PDF document text
    • https://egyiksem.hu/uploads/file/bosufuzas.pdfIn PDF document text
    • http://saraiaser.nl/userfiles/file/62545180559.pdfIn PDF document text
    • https://fotofidelity.cz/userfiles/file/6212873882.pdfIn PDF document text
    • https://www.ventisilva.com.br/ckfinder/userfiles/files/ladubugutotoriwofaxarew.pdfIn PDF document text
    • https://marblobathware.ph/app/webroot/img/files/72113329596.pdfIn PDF document text
    • http://jikaramen.com/uploads/files/63026397747.pdfIn PDF document text
    • http://asia-test.informacittadino.net/media/files/13497947881.pdfIn PDF document text
    • https://www.oalysa.cz/ckfinder/userfiles/files/liluwikusib.pdfIn PDF document text
    • http://goldenstarhotel.vn/images/uploads/files/49022871390.pdfIn PDF document text
    • http://piannocreativo.com/js/new/fckeditor/userfiles/file/79933990874.pdfIn PDF document text
    • https://pagodatalk.com/_UploadFile/Images/file/wofona.pdfIn PDF document text
    • http://realtor-madrid.com/uploades/fckeditorfile/sosanutezonoxezumujinime.pdfIn PDF document text
    • http://portakalweb.net/home/portakal/public_html/ckfinder/userfiles/files/xixafedugoru.pdfIn PDF document text
    • http://elskenecologie.nl/files/xarumawaz.pdfIn PDF document text
    • https://cncunse.com/d/files/jifupovazevugesulodeb.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=screen+rotation+controlPDF 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_off0000e667.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE667 17820 bytes
SHA-256: c89f81ba8b291d7e631601d7eb6731967d97d22bc75e786e23cef294e792fde2
font_01_sfnt_off0001143c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1143C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012c53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C53 10132 bytes
SHA-256: b90d6e73e261d24ad8344d6715ab954a8f6fef7bbacf12926665b7a513c843dc

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