Malicious PDF — malware analysis report

Static analysis result for SHA-256 3cdf5aac569d1f82…

MALICIOUS

PDF

80.9 KB Created: 2021-09-12 18:53:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 715496ba2cf037eaee05c19fa6544f02 SHA-1: 4e5227a9723b3dbfda8ed639e84c7cd5b42bc00f SHA-256: 3cdf5aac569d1f8280556fb375e516979edfa47145e98d5dd2cd2d96f305b906
126 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious. It contains numerous embedded URLs, with a significant heuristic identifying it as a link farm on disposable hosting. One of the embedded URLs points to a PDF hosted on 'fsnmmaterials.com', which is suspicious. The presence of a link farm suggests an attempt to distribute malicious content or phish users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://fsnmmaterials.com/UPFILE/userfiles/files/85643061062.pdf In PDF document text
    • http://henanshuangxin.com/d/files/wubujimekinu.pdfIn PDF document text
    • https://oriental-kitchens.com/userfiles/files/degoveneziwiwawuxadenov.pdfIn PDF document text
    • http://petswithlove.com/cvsprojects/SSK/Source/2.0.0/images/files/suxapevafemafisabowale.pdfIn PDF document text
    • https://shriramsteels.in/public/ckfinder/userfiles/files/pipurefulafujiniza.pdfIn PDF document text
    • http://ajivikafinance.com/userfiles/file/99068049789.pdfIn PDF document text
    • http://chhattisgarhsanskritboard.in/sharpinstitute/images/files/1626965402.pdfIn PDF document text
    • http://konditsionery-zheleznodorozhnyi.ru/upload_picture/file/sumomofinifuniruv.pdfIn PDF document text
    • https://bcbc3399.com/upload/files/76325735404.pdfIn PDF document text
    • https://semut73.com/contents/files/tokigibixuliwigumapo.pdfIn PDF document text
    • http://kmbb.at/userfiles/file/7528084041.pdfIn PDF document text
    • http://www.cpiequipos.com/assets/images/user_files/files/76992587893.pdfIn PDF document text
    • https://dalilak1.com/userfiles/file/55037377728.pdfIn PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613cb64719f49---47598948776.pdfIn PDF document text
    • http://aromaonly1.com/yamituki-n/uploads/files/sufisivevesujolezemojux.pdfIn PDF document text
    • https://lemarko.com/userfiles/file/63681655738.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/1613c746135929---vutuwajilerajosepa.pdfIn PDF document text
    • https://mn-lawfirm.com/box/userfiles/file/kodazonexufot.pdfIn PDF document text
    • https://2ruoteexpo.it/ckfinder/userfiles/files/32135033350.pdfIn PDF document text
    • http://5thaveseniors.org/userfiles/file/runom.pdfIn PDF document text
    • http://themetamorphoseprogram.com/userfiles/file/ramifuwuzitofig.pdfIn PDF document text
    • http://www.hkimm.hk/_bin/ckfinder/userfiles/files/69829820241.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=como+resetar+celular+android+pelo+pcPDF 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_off0000d75e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD75E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ef75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF75 10804 bytes
SHA-256: fd91ae4fbaeef0b290107b26753763ac2e7af3f2d2a222eb1785bd1f72b8e514
font_02_sfnt_off00010858.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10858 17720 bytes
SHA-256: 3946f0d987186bb9826216a087e1e8077ee256bb1bbb157a2b0f9d160ab37490