Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f3a385b029a69e8…

MALICIOUS

PDF

101.1 KB Created: 2021-09-18 15:17:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 6a06aca213e0c24db06513f6a790bdfb SHA-1: 07ebb8b55c8dd486c264aa01c1aad1ff1dcfca05 SHA-256: 8f3a385b029a69e8efaa55a65841d084e535db2ee16a991cf37f55dc0f7b6c12
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected by ClamAV as 'Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0'. Heuristics indicate the PDF contains a link farm with numerous disposable URLs, suggesting a phishing or malware distribution attempt. The ML classifier also flagged the PDF with a high probability of being malicious. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9877

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
  • 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://matras-matrasych96.ru/admin/ckfinder/userfiles/files/tokajifo.pdf In PDF document text
    • http://terwaarde.be/ckfinder/userfiles/files/98193230294.pdfIn PDF document text
    • http://transbur.ru/admin/ckfinder/userfiles/files/57498354224.pdfIn PDF document text
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/850d01368fced605d02fde099757cd23/57615801986.pdfIn PDF document text
    • http://studiotrusso.it/userfiles/files/matirixabiruloguxe.pdfIn PDF document text
    • http://chpcentre.com/files/file/doragumekudi.pdfIn PDF document text
    • http://rts-3.ru/upload/files/48565346188.pdfIn PDF document text
    • https://floridainvestment.cz/files/file/28983785498.pdfIn PDF document text
    • https://tyko.pl/userfiles/file/56347108594.pdfIn PDF document text
    • http://fijiembajak.com/uploads/ck_uploads/files/wapagilifaxol.pdfIn PDF document text
    • https://xn--80aesyq.xn--p1ai/files/file/lizaka.pdfIn PDF document text
    • http://elskup.pl/images/assets/file/32888910821.pdfIn PDF document text
    • https://ipic.vn/userfiles/file/rujajubij.pdfIn PDF document text
    • http://edu-family72.ru/content/images/uploads/file/sotulik.pdfIn PDF document text
    • http://dansungsala.com/uploads/files/91560256314.pdfIn PDF document text
    • http://vaonhaphatphap.com/images/uploads/files/dikovisod.pdfIn PDF document text
    • http://oreoltour.ru/sites/default/files/file/99894504062.pdfIn PDF document text
    • https://leresto-niort.fr/images/userfiles/files/74138575878.pdfIn PDF document text
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/5a0f37f0f87088aaa7c73a6ce243f270/xuridekawam.pdfIn PDF document text
    • https://portalbime.com/UploadedFiles/New/file/pubozowulavulolirole.pdfIn PDF document text
    • http://cameralehiep.com/hinhanh_fckeditor/file/tubenazavakupasipipaseluv.pdfIn PDF document text
    • http://gamax-moto.cz/data/dokumenty/13575989870.pdfIn PDF document text
    • https://mk-promotions.com/ckfinder/userfiles/files/31586345760.pdfIn PDF document text
    • http://sententtech.com/file_media/file_image/file/kexewixunusasexabowud.pdfIn PDF document text
    • http://hjhchem.com/upload/files/jixisonakijuput.pdfIn PDF document text
    • http://nieruchomosci-swidnica.pl/userfiles/file/wisafesisog.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=download+adm+pro+for+androidPDF 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_off00011ed3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11ED3 21312 bytes
SHA-256: 9a73971982274a611e29b114426eb808046a4b351428346ac281280685ef1e62
font_01_sfnt_off00015584.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15584 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00016d9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16D9B 10348 bytes
SHA-256: ee74d757b171eadbe62e9878402b51b1ed4e5b1acd1c3df646f5813826957375