Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e8525f6779371f4…

MALICIOUS

PDF

73.4 KB Created: 2021-09-09 06:38:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 0b27301526ba84fec4ccbae366dfafbd SHA-1: a854ac5bed58cf33d450438af22341f8fe41a940 SHA-256: 4e8525f6779371f4ed31428072f5950c610dc747950f68505e96abfda5abb583
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristic analysis revealed it functions as a link farm, embedding a large number of URLs pointing to disposable hosting, likely to distribute further malware or phishing content. The presence of embedded URLs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic strongly suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://philabc.ru/uplcv?utm_term=pixel+shot+apk PDF link annotation
    • https://stallion-international.com/userfiles/file/91872694423.pdfIn PDF document text
    • http://gardensyellowcab.com/admin/images/file/godazanodenuzedesikid.pdfIn PDF document text
    • http://ambulatorioveterinariocamali.com/userfiles/files/mupakugazanazedevakumuf.pdfIn PDF document text
    • https://jeneifogaszat.hu/cikkdata/files/73229006987.pdfIn PDF document text
    • http://www.physedu.in/newsite/userfiles/files/guxolidemomaxag.pdfIn PDF document text
    • https://areopag.ru/sites/default/files/uploads/96086922300.pdfIn PDF document text
    • https://www.highettmetal.com.au/application/third_party/ckfinder/userfiles/files/sesapupadinuke.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/09112se8sf75babm4e3l91gsa6/furawol.pdfIn PDF document text
    • http://mylodge-naoshima.com/12002658220.pdfIn PDF document text
    • http://lpc2529.com/piceditor/file/gotowomuxuf.pdfIn PDF document text
    • https://kp-bs.ru/upload/files/93822966526.pdfIn PDF document text
    • http://dptour.net/bot/ckfinder/uf/files/34809634502.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161359052ae298---lagopobapowubodeme.pdfIn PDF document text
    • http://schokoladenbrunnen.de/idata/miweroworuli.pdfIn PDF document text
    • http://cukiernia-waltar.pl/qcms/userfiles/file/guvukad.pdfIn PDF document text
    • http://mmsmarin.com/imgimage/file/vufuvenezizotise.pdfIn PDF document text
    • https://megashina24.ru/files/files/95962230108.pdfIn PDF document text
    • http://dywin.com/uploadfile/files/34125036359.pdfIn PDF document text
    • https://smartstone.ca/userfiles/files/25054108553.pdfIn PDF document text
    • http://www.vlaamspatientenplatform.be/_plugin/ckfinder/userfiles/files/22378704115.pdfIn PDF document text
    • https://www.burnat-provins.ch/ck/ckfinder/userfiles/files/99305035355.pdfIn PDF document text
    • https://houstoncoinclub.org/FCKeditor/file/35121242735.pdfIn PDF document text
    • http://csc0532.com/userfiles/file/20210905224913_zg2wiy.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_off0000bd10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD10 17116 bytes
SHA-256: 215af258725ec7bc4e55099de4438504c5a4c99592e5ca63d723b2b5ace1e0e3
font_01_sfnt_off0000e8db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8DB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000100f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100F2 10340 bytes
SHA-256: 8e23ae5969c091018a87fd89075ccfd8765372924e796a6ac69b159a0e9d7d92

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