Malicious PDF — malware analysis report

Static analysis result for SHA-256 d20cd9f78ed0d8d7…

MALICIOUS

PDF

79.4 KB Created: 2021-09-21 02:17:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 2ff26c0edc78341714d68004bd436e98 SHA-1: 159d701c7584546856a90fe76ab60987f375867d SHA-256: d20cd9f78ed0d8d7bc6cb537255a41cbbb09124bc376db87c65a443fff0d81db
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing or trojan variant. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document contains numerous links to potentially disposable hosting, suggesting a tactic to obscure malicious destinations. While no scripts were extracted, the structure and numerous embedded URLs point towards an attempt to redirect users to malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

Heuristics 5

  • 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.
  • 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://karczma-zaborow.pl/userfiles/file/23300965843.pdf In PDF document text
    • https://clinicscrm.com/img/files/96742586981.pdfIn PDF document text
    • https://angelsstaff.com/uploads/file/72947827943.pdfIn PDF document text
    • http://narnivet.com/userfiles/files/fovanagimojagepapi.pdfIn PDF document text
    • http://nhakhoanhantin.com/media/ftp/file/75975819185.pdfIn PDF document text
    • http://kcntanduc.vn/img_duhoc/files/kuwemel.pdfIn PDF document text
    • https://campermagazine.tv/public/file/pilufeg.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613970d2974bc---86827789813.pdfIn PDF document text
    • http://palyavalaszto.hu/teszt/upload/file/84303000820.pdfIn PDF document text
    • https://fleuriste79.fr/ckfinder/userfiles/files/rubegoxusozo.pdfIn PDF document text
    • http://ckud.handysociality.com/upload/files/bazexidujegax.pdfIn PDF document text
    • http://wxbeimei.cn/upload/ckimg/files/202109081159086611.pdfIn PDF document text
    • https://jagamimpi.org/contents/files/82864024896.pdfIn PDF document text
    • http://dtmaso.com/public_html/Imagens/file/bokikemij.pdfIn PDF document text
    • http://nikkenj.com/userfiles/file/zazarejafikivosi.pdfIn PDF document text
    • https://aparcaderoshaddaichile.cl/uploads/images/files/lejufusulelibeduran.pdfIn PDF document text
    • http://kavtas.com/images_upload/files/zajemuto.pdfIn PDF document text
    • https://renault-service.com/userfiles/xawizibaxatenibinu.pdfIn PDF document text
    • https://avphunter.ro/ckfinder/userfiles/files/nalix.pdfIn PDF document text
    • https://warsztatgdynia.pl/app/webroot/media/files/81905508521.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1613709e3b6d50---70246218174.pdfIn PDF document text
    • http://muzeumostrowiec.pl/obrazy/file/vipasefolizitebuwite.pdfIn PDF document text
    • https://hamzakocakoglu.com/userfiles/file/85783009918.pdfIn PDF document text
    • http://impactpluslearning.com/ckfinder/userfiles/files/vafosul.pdfIn PDF document text
    • https://delphin-bau.com/ckfinder/upload/files/814988295.pdfIn PDF document text
    • http://toonesk.com/upload/44524942122.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=facebook+iphone+para+android+apkPDF 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_off0000caf9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAF9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e310.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE310 10508 bytes
SHA-256: 8224dc957460cc109d19d62fbd090e1543861f1ff2eff5b6ecc58c2599b2fa2f
font_02_sfnt_off0000fa98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA98 20300 bytes
SHA-256: b2689f4e330ab863f2e3c5f4274b05e2359d963f7deba69a51e7b3b7adabb231