Malicious PDF — malware analysis report

Static analysis result for SHA-256 8fc759636026208b…

MALICIOUS

PDF

83.3 KB Created: 2021-09-21 07:07:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3b9c250d06082d1e9393f8d8742ea2b0 SHA-1: c3b37c25077dc90c588abddb68e1b02729fc3ff6 SHA-256: 8fc759636026208b55a40bded74a5426b747ba07215909cbdd90069b214938dd
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The presence of numerous embedded URLs, many pointing to disposable domains and structured as a link farm, suggests a phishing or malware distribution campaign. The document body was unreadable, but the PDF_SEO_DISPOSABLE_LINK_FARM heuristic strongly indicates a malicious link aggregation strategy.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://iseveranscopy.com/upload/editor/file/86858637305.pdf
    • https://sunwayhk.com/louis/STARKGROUP/ckfinder/userfiles/files/xigefivolubano.pdf
    • https://aynadakikemalizm.com/resimler/files/tokena.pdf
    • https://dancleland.com/img/upload/file/regomuxadimulaku.pdf
    • https://gitteszoneklinik.dk/ckfinder/userfiles/files/vupadosoxe.pdf
    • http://petraifevronii.ru/ckfinder/userfiles/files/28405087790.pdf
    • http://tensoinox.com/userfiles/files/74418617673.pdf
    • http://clinicaveterinariabilancino.it/userfiles/files/70055399410.pdf
    • https://kasihpaham.com/contents/files/zegudivejovavifarizagudu.pdf
    • http://gioiacompany.net/images/upload/file/65661466136.pdf
    • http://architettipassarinmarzotto.com/userfiles/files/11400780404.pdf
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c07673b4ce---8785464430.pdf
    • http://lehnerkom.de/images/uploaded/file/wesiwafosagilumozeneko.pdf
    • http://finance-bulldog.cz/UserFiles/File/lupejomavepiweberujoxi.pdf
    • http://thietkevang.com/upload/files/tevez.pdf
    • https://goez3.com/10005001208290177/ckfinder/userfiles/files/dizedeki.pdf
    • http://tabbanbros.com/admin/fckeditor/editor/filemanager/connectors/upload/file/fotebokubib.pdf
    • http://millenium.moscowfashion.net/content/xuploadimages/file/vajiwe.pdf
    • http://gaestehaus-am-erlkoenig.de/img/editor/file/61074945276.pdf
    • http://alvit-bk.ru/userfiles/file/11410151348.pdf
    • http://rsport.eu/yonexshop/static/file/fiseviradup.pdf
    • http://branpc.in/ckfinder/userfiles/files/wizutajet.pdf
    • http://fgsconsulta.com.br/ckfinder/uploads/userfiles/files/wimopimuzanoxexegi.pdf
    • http://ryyw.com/upload/files/2021/09/202109020451415893.pdf
    • http://www.vegagastro.pl/upload/file/monixali.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=death+run+3
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e268.bin
3214db730d9772e87690791d6994fc932932c1d008ab4635e9a56691c3e76e30		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE268 10052 bytes
font_01_sfnt_off0000f8c4.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF8C4 16792 bytes
font_02_sfnt_off000110d6.bin
3e35eda4584d00fb98d4dd97a3d12ff589ec57a14b87f5b3dab4e84880c59362		 pdf-font-stream PDF embedded font (sfnt) at offset 0x110D6 18012 bytes

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