Malicious PDF — malware analysis report

Static analysis result for SHA-256 2e90b1382b2f4e3d…

MALICIOUS

PDF

82.9 KB Created: 2021-09-14 07:45:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 4c934851c2cade131cd0bc6665ceae74 SHA-1: 033e3cfbe846872c4965eb9a1d80f68fd606c7be SHA-256: 2e90b1382b2f4e3d6a4878735e80cb47bd496bc6a35c9a4b4e4b4b7d3c6532f8
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to numerous distinct domains, with one identified as potentially disposable hosting. The embedded URLs, while some are marked benign, contribute to the overall suspicious nature of the document's intent to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://studionegrelli.it/userfiles/files/12996344189.pdf In PDF document text
    • http://kelakewangshangduchang.a9188.com/upload_files/art_files/files/20210906_173122.pdfIn PDF document text
    • http://xn----7sbab1bcaqplb0ccyi9d.xn--p1ai/files/file/16753675794.pdfIn PDF document text
    • http://flygarfield.net/userfiles/file/libodubikifomefuvirejote.pdfIn PDF document text
    • https://apc-algercentre.dz/ckfinder/userfiles/files/87160634417.pdfIn PDF document text
    • http://irvine.songhakbbq.com/uploads/files/guzavek.pdfIn PDF document text
    • http://villaroyalenews.com/userimages/tuwijedubosabegulexa.pdfIn PDF document text
    • http://hoangduy.vn/vn/files/semigifutupetaxamibizit.pdfIn PDF document text
    • https://daulte.com/ckfinder/userfiles/files/nibodi.pdfIn PDF document text
    • https://toyotaautobody.com/ckfinder/userfiles/files/lofewojexibotixiteput.pdfIn PDF document text
    • https://petala.gr/userfiles/file/gubovadusuga.pdfIn PDF document text
    • https://delaneyllc.com/ckfinder/userfiles/files/soxowefobapasosa.pdfIn PDF document text
    • https://7mark3t2-7aya.com/contents/files/29190770785.pdfIn PDF document text
    • http://firewheels.pe/userfiles/file/tejimifiwojupuxugiwamano.pdfIn PDF document text
    • https://purmoradiatoriai.lt/images/files/68477767391.pdfIn PDF document text
    • http://hanart21.com/files/userfiles/file/97609148857.pdfIn PDF document text
    • http://montpellier-business-plan.fr/mbp/upload/images/images/upload/ckfinder/zibekoxazawuruno.pdfIn PDF document text
    • https://transturist.ba/ckeditor/ckfinder/files/files/pefawokitaxifewe.pdfIn PDF document text
    • https://buonoantonio.it/userfiles/file/rafibe.pdfIn PDF document text
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/1lqunad5sr3v9cr3amo3nhosje/29637212768.pdfIn PDF document text
    • https://malinaionescu.ro/userfiles/file/8075405936.pdfIn PDF document text
    • https://iwistw.com/upload/files/61984560218.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=dobry+krokomierz+na+androidaPDF 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_off0000e123.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE123 17724 bytes
SHA-256: 0bb7f59b209257d79e05029aad287b873a1e71b07004da4cff4627851a9f9d1a
font_01_sfnt_off00010e3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E3D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012654.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12654 10504 bytes
SHA-256: e2d56297fcfc391cfba303d63dc0bc47db0e8067800a7896bb84c8a6e10ed237

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