Malicious PDF — malware analysis report

Static analysis result for SHA-256 41fcd505a5599920…

MALICIOUS

PDF

70.3 KB Created: 2021-09-11 12:08:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: ed89683ce1e40dd0053d6f3247e11ab1 SHA-1: f90f319d421e6b97e0360659bde6a3632a3f3e57 SHA-256: 41fcd505a55999202a6bcd9349c114e2912e06c9500ba482ea42983634100bcd
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to other PDF files, many hosted on domains with suspicious naming conventions or potentially disposable hosting. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic and the high number of distinct hosts suggest a deliberate effort to create a link farm for malicious purposes, likely phishing or malware distribution. ClamAV detection further confirms its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://zamdq.com/filespath/files/20210910160734.pdf In PDF document text
    • http://www.cerel.eu/images/wyswig_images/file/rezipataxuvumigufivisarex.pdfIn PDF document text
    • https://estatecambodia.com/htdocs/cljr/data/files/49128551272.pdfIn PDF document text
    • http://argyleliquidations.com/userfiles/files/wubabo.pdfIn PDF document text
    • http://huyndaicaudien.com/upload/files/wewozukukolibelonupiwuva.pdfIn PDF document text
    • http://sjhtractor.com/d/files/fuvuwokutozeponozowadil.pdfIn PDF document text
    • https://makemycake.gr/wp-content/plugins/super-forms/uploads/php/files/50jqs3jpql7s3ftlkjq8aksolm/13124843548.pdfIn PDF document text
    • http://ardeche.proximeo.com/ckfinder/userfiles/files/fukavexuvofegupemewukekuz.pdfIn PDF document text
    • http://mclarenquartz.in/ci/userfiles/files/nifobaveta.pdfIn PDF document text
    • http://jucal.es/images/file/80283569869.pdfIn PDF document text
    • http://teleserviciomalaga.com/ckfinder/userfiles/files/40448975574.pdfIn PDF document text
    • http://moretonassets.net/userfiles/60635848535.pdfIn PDF document text
    • https://guruvinodji.com/Userfiles/file/kujegugasemi.pdfIn PDF document text
    • http://photo-ostrov.com/ckfinder/userfiles/files/93603192883.pdfIn PDF document text
    • http://sakesushilakehavasu.com/uploads/files/84940807349.pdfIn PDF document text
    • http://alfonsoguiggiarchitetto.it/userfiles/files/7442646487.pdfIn PDF document text
    • http://recviem.ru/img/upload/gogimutebisegomukumi.pdfIn PDF document text
    • http://evaemlak.com/userfiles/file///36772335254.pdfIn PDF document text
    • https://doanhnghiepvietnam.niengiamdoanhnghiep.vn/img_duhoc/files/rizoluke.pdfIn PDF document text
    • http://szsahsh.com/uploads/files/83391564362.pdfIn PDF document text
    • http://mebco.ru/images/file/17989301729.pdfIn PDF document text
    • https://shevtsov-art.com/uploads/files/44550213795.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=download+game+spike+volleyball+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_off0000b34b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB34B 15412 bytes
SHA-256: 9bd680ccddf647ab31a020d4654f734389085b865e60f3b96f9601bb719608d2
font_01_sfnt_off0000d9db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9DB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f1f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1F2 11136 bytes
SHA-256: 959cec3fdc512510e1daea29a3118beaf4e8bf5dc3c12d6d6e4a18fa86ea9a65

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