Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a6982231b1756d7…

MALICIOUS

PDF

72.1 KB Created: 2021-09-16 21:30:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: b64fc9a7f5123dcc64cdfe77a4374d45 SHA-1: 0c839060fb66d8bee5c954309624d3a47ebc6c12 SHA-256: 2a6982231b1756d7fa90ebd02374a1b9ab0f6a5e4d3fc725569ff71aca61e79b
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, identified by the PDF_SEO_DISPOSABLE_LINK_FARM heuristic, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body is unreadable, but the presence of many external links points to a lure mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 https://oniceh.ru/uplcv?utm_term=firestick+audio+bluetooth PDF link annotation
    • https://cfacgroup.com/uploads/FCK_files/file/vajurowaropoz.pdfIn PDF document text
    • http://thewellmanteam.com/userfiles/files/23436095861.pdfIn PDF document text
    • http://9262895.ru/ckfinder/userfiles/files/62391524367.pdfIn PDF document text
    • http://teamhead.net/userfiles/file/67181082048.pdfIn PDF document text
    • http://hyundai-dongdo.vn/images/files/raxaxewitizixam.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/161353c5e38d2e---bafepanumavufugugusiruje.pdfIn PDF document text
    • http://truhlarstvisollner.cz/data/file/34004257730.pdfIn PDF document text
    • https://0900107678.com/upload/file/litagerajebalakimekomubit.pdfIn PDF document text
    • https://widerbet.pl/userfiles/file/68433400266.pdfIn PDF document text
    • https://bibonatura.com/ckfinder/userfiles/files/xufemunareri.pdfIn PDF document text
    • https://mmoxx.mn/userfiles/files/pijugene.pdfIn PDF document text
    • http://noithatnhapkhaugiasi.com/luutru/files/87844439230.pdfIn PDF document text
    • http://rsti.biz/files/fck/file/zawikejuraw.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16137669d6f93c---52948431312.pdfIn PDF document text
    • https://geloracinta.com/contents/files/72345528195.pdfIn PDF document text
    • https://sofupingame.net/calisma2/files/uploads/sarakejigovurusizekinulop.pdfIn PDF document text
    • http://laarakkers.com/ckfinder/userfiles/files/14520867697.pdfIn PDF document text
    • http://twfindia.in/userfiles/files/gigurirawaxubaserixinuvit.pdfIn PDF document text
    • http://hichipper.com/hichipper/uploadfile/file/2021090718595273499.pdfIn PDF document text
    • http://xhiehchin.com/Xhieh_News/_file/36122088356.pdfIn PDF document text
    • https://rm-parketi.si/uploads/81412931972.pdfIn PDF document text
    • http://adec-interiors.net/Uploads/file/tewofavopunew.pdfIn PDF document text
    • http://ancheng-medical.com/uploadfile/files/kanovuka.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_off0000ba06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA06 15836 bytes
SHA-256: 39fe9052f2edfb5e72c6c40f813817c4a8ee3b35f4bad844a65e96d62baba05d
font_01_sfnt_off0000e270.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE270 10672 bytes
SHA-256: 4f732fde6c95b2666f999607762c4d9a1222d7d18e4c6c9b150407d3f8f553f7
font_02_sfnt_off0000fb09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB09 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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