Malicious PDF — malware analysis report

Static analysis result for SHA-256 d33f6717e2962071…

MALICIOUS

PDF

80.3 KB Created: 2021-09-29 09:51:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 19a19d696b5ee013ed1941145c84f1fc SHA-1: ecd06da00b5eb301d6808e16c626d18c0c58453b SHA-256: d33f6717e2962071901c0af1c66b9d1b0d6d0e13653c0d8478b0d1e6682b9636
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan' and an ML classifier indicating maliciousness. The PDF contains numerous external URIs, suggesting it functions as a link farm or a lure to external malicious sites. The presence of embedded URLs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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 https://oniceh.ru/uplcv?utm_term=song+of+solomon+commentary+pdf PDF link annotation
    • https://cornerstonelaw.eu/userfiles/file/35841922387.pdfIn PDF document text
    • http://szyqjsj.com/UploadFile/file/20210902020739920.pdfIn PDF document text
    • http://midesignvn.com/uploads/files/18135387124.pdfIn PDF document text
    • https://gonguyenkhoi.vn/upload/files/noxugunojexo.pdfIn PDF document text
    • http://st03.it/userfiles/files/wexatezinuvukoxugegugape.pdfIn PDF document text
    • http://organizeteknik.com/userfiles/file/bajelisipamupegozubumuze.pdfIn PDF document text
    • https://alzubidi.com/userfiles/files/gukixufawibowenib.pdfIn PDF document text
    • http://xn--76-6kca8aqc6c.xn--p1ai/pic/userfile/40515608322.pdfIn PDF document text
    • http://kenhuffbuilders.com/userfiles/file/bijena.pdfIn PDF document text
    • https://fontan-montag.ru/img/upload/xekiwemanumunupatak.pdfIn PDF document text
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16138a08f56af0---nofewokexerovikatujelok.pdfIn PDF document text
    • http://studiophotosfashion.it/userfiles/files/mumisiwij.pdfIn PDF document text
    • https://shipnhanh247.vn/asset/files/tenumewilumidiniroratize.pdfIn PDF document text
    • https://eminenceconstruction.ca/viking1/uploads/files/kamaloma.pdfIn PDF document text
    • http://biosurfest.com/userfiles/files/37087503664.pdfIn PDF document text
    • https://bearings.vn/images/ckeditor/files/winewixaporakip.pdfIn PDF document text
    • https://slotpt2.com/contents/files/roxifimosafaxosud.pdfIn PDF document text
    • http://becskeicsodajo.hu/admin/fck_upload/file/zigisetixan.pdfIn PDF document text
    • http://deforma.it/userfiles/files/tadobigiwoxaxoti.pdfIn PDF document text
    • http://rungruangsteel.com/public/upload/userfiles/files/83979189282.pdfIn PDF document text
    • https://ostrichpharmaceuticals.com/userfiles/file/labitotijo.pdfIn PDF document text
    • https://hung168.tw/UserFiles/files/50828810085.pdfIn PDF document text
    • http://dglytbt.com/upfolder/e/files/20210905135431.pdfIn PDF document text
    • https://indiantalentjunction.com/milan/media/fagebujoramodobilujawo.pdfIn PDF document text
    • https://pierreseche.fr/userfiles/file/nafakipizebavaxa.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_off0000cd35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD35 11060 bytes
SHA-256: ea56c7e81b16e0dcfc6cf4110ef3cc9cdf710a05c311ab2ab857dcf69ad4c7b2
font_01_sfnt_off0000e6d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6D8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000feea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEEA 20456 bytes
SHA-256: cadfc34f08c6fd159a4a48c044ff84410ed45daaa015d04cd5b41c87adc1fb1d

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