Malicious PDF — malware analysis report

Static analysis result for SHA-256 0e83080aa85dd1ea…

MALICIOUS

PDF

84.8 KB Created: 2021-09-09 10:34:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-23
MD5: 93d44f48a3140746f7a3eaad5378729f SHA-1: d905ff20328c9f7b8881acc9c97770561e44cc67 SHA-256: 0e83080aa85dd1ea549937ea6292ac43c6362484a72be59e965f4a726fa5216d
126 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://smidgel.ru/uplcv?utm_term=young%27s+analytical+concordance+pdf+free+download PDF link annotation
    • https://vjlabor.pitscovn.com/uploads/Upload/files/resiluzilopewurimidarox.pdfIn PDF document text
    • http://dydlhx.com/upfiles/file///ditovorajopizowot.pdfIn PDF document text
    • http://daeryuhealthcare.com/ckupload/files/16588079442.pdfIn PDF document text
    • http://4bx.pl/public/file/76606356423.pdfIn PDF document text
    • https://yuktogel.com/contents/files/nemozigenapebikatelaxi.pdfIn PDF document text
    • http://andersonlawdecorah.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/67794488252.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16139966b47d0f---pasebukuku.pdfIn PDF document text
    • http://lejuriste.ru/files/file/76984424028.pdfIn PDF document text
    • https://enerjimakine.com/tsrm1/img/userfiles/file/wobose.pdfIn PDF document text
    • http://nenorm.com/files/files/25166109989.pdfIn PDF document text
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/6490a0266c100b3dbf5839943b67fea8/tarovazobiwasokiz.pdfIn PDF document text
    • https://leavereview.com/customerinterview/ckfinder/userfiles/files/tenule.pdfIn PDF document text
    • http://vietsaovang.com/uploads/userfiles/file/gebedajogozubaleraxota.pdfIn PDF document text
    • https://sitarasign.ir/data/file/vakogeruravuzolipojab.pdfIn PDF document text
    • http://personal.sut.ac.th/chantira/port/ckfinder/userfiles/files/wovuvurofesoronazap.pdfIn PDF document text
    • http://gramercy-grand.ru/files/file/72613370595.pdfIn PDF document text
    • http://szguilong.com/userfiles/files/rosijepagoferutusetozuwe.pdfIn PDF document text
    • https://md-bud.pl/szklo/photos/file/ferowamasa.pdfIn PDF document text
    • http://de-ko-gmbh.com/ckfinder/userfiles/files/38607678492.pdfIn PDF document text
    • http://deeringbayrealestate.com/userfiles/files/tanefibanedixobo.pdfIn PDF document text
    • http://gewoongroen.eu/app/webroot/files/userfiles/files/47436460306.pdfIn PDF document text
    • 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_off0000e3b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3B6 18364 bytes
SHA-256: ddb021fb5a5708a5d5851d2d0e8872fd0247f38a4e06d88f52858c9feba7d649
font_01_sfnt_off000113a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113A7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012bbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BBE 11112 bytes
SHA-256: 22ec34fdca5f823d4998cedc49c1cd6fd9df534f05f0688aadbe8750635c7167

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