Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb09a12e39f1e614…

MALICIOUS

PDF

91.5 KB Created: 2021-09-18 02:07:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 12e7a9dcc60213e6babd9adcb46db483 SHA-1: 769c39a39e49006dce41afb5ced56863e1cdf742 SHA-256: eb09a12e39f1e6148f3d428217b0c797c519e25099c3324ba68b62cd10647c7a
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains numerous external URIs and is identified as a link farm hosted on disposable domains, indicating a phishing or malware distribution attempt. The ClamAV detection further supports its malicious nature. The document body is heavily obfuscated and unreadable, preventing a more detailed analysis of its specific lure.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4960

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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://coretry.ru/uplcv?utm_term=steamunlocked+prince+of+persia PDF link annotation
    • http://upakuika.com/img/file/20814401876.pdfIn PDF document text
    • https://digireg.org/upload/87679379416.pdfIn PDF document text
    • http://gtlmarinefuel.com/userfiles/file/lixanusulefopipa.pdfIn PDF document text
    • http://quangcongluc.com/upload/files/4946064961.pdfIn PDF document text
    • http://skkouty.cz/ckfinder/userfiles/files/36772085784.pdfIn PDF document text
    • http://tatugigo.com/ckfinder/userfiles/files/99618709038.pdfIn PDF document text
    • http://barrospizzadb.com/uploads/files/11509518650.pdfIn PDF document text
    • https://obermeyer-modemarkt.de/upload/file/bogaregeneviwemiwavewi.pdfIn PDF document text
    • http://tomboy2.com/images/library/File/62437684749.pdfIn PDF document text
    • http://retco.ge/ckfinder/userfiles/files/xiledarigutaterelomodotot.pdfIn PDF document text
    • http://chaodontuonglai.vn/uploads/ck_upload/files/pekikoreduzejexogulojerow.pdfIn PDF document text
    • https://www.notusweb.com.br/ckeditor/ckfinder/userfiles/files/vupazuvebexisivudubojuk.pdfIn PDF document text
    • https://marblo.ph/app/webroot/img/files/wuwadejib.pdfIn PDF document text
    • https://netcsemege.elelmiszer-hazhozszallitas.hu/ckfinder/userfiles/files/15218927945.pdfIn PDF document text
    • http://maxbrio.kr/files/files/18029811942.pdfIn PDF document text
    • http://garankuccu.com/upload/fckimagesfile/af3bd3966a80887846bd26484f758f23.pdfIn PDF document text
    • http://christopherspubandgrille.com/userfiles/files/rozakolalufa.pdfIn PDF document text
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143cf840d82c---69815593473.pdfIn PDF document text
    • https://cryptoshift.be/anaeter_capital/siteadmin/userfiles/files/63649280411.pdfIn PDF document text
    • http://speckrepej.com/upload/file/93017714670.pdfIn PDF document text
    • http://tortsurprise.ru/upload/redactor/files/bababepeloj.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138461d48478---vovanepofi.pdfIn PDF document text
    • http://secoinblock.com/upload/files/rozasaf.pdfIn PDF document text
    • http://hublihorse.com/uploads/userfiles/files/70035009362.pdfIn 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_off00010c16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C16 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012428.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12428 18720 bytes
SHA-256: 022057903a29e89fda5738ccebdd885a06a441312d51d064f0b33d031906c311
font_02_sfnt_off000154ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x154CE 11048 bytes
SHA-256: 9b5270eed0c3064842c51373ebd50f8f41f1d81a7d64ecfed67d22551f968bdb

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