Malicious PDF — malware analysis report

Static analysis result for SHA-256 46b7839e21af0af2…

MALICIOUS

PDF

85.1 KB Created: 2021-09-17 05:11:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 8b06fd170eb45470ae94e213b4da3641 SHA-1: f8850875ac98a0547d3f5aaba8f59d604bf794cd SHA-256: 46b7839e21af0af26bcfc324534462d699be3ca4e79be04dafe04928ef50f1d4
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan' and an ML classifier indicating maliciousness. It contains numerous embedded URLs, many of which are on disposable hosting and appear to be part of a link farm, suggesting a phishing or malware distribution scheme. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this conclusion.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://queure.ru/uplcv?utm_term=strip+maker+app PDF link annotation
    • http://nacyc.jp/Upload/file/40359123622.pdfIn PDF document text
    • https://zippy-inc.com/app/webroot/userfiles/files/sunevulivuwidupipot.pdfIn PDF document text
    • https://12waktu.com/contents/files/46941801751.pdfIn PDF document text
    • https://semangkabiji.com/contents/files/18092010731.pdfIn PDF document text
    • http://silverspringabw.com/uploads/files/56464431614.pdfIn PDF document text
    • http://kalmi.ru/upfiles/files/netugap.pdfIn PDF document text
    • http://hkbroadwin.com/userfiles/46430957580.pdfIn PDF document text
    • https://rougezenekar.hu/files/file/43711179021.pdfIn PDF document text
    • http://podhoru.cz/userfiles/file/pifuxukogiri.pdfIn PDF document text
    • http://vinaaquachem.com/uploads/files/gokezomodu.pdfIn PDF document text
    • http://suspensionestg.mx/userfiles/file/nikevijozenutem.pdfIn PDF document text
    • http://ministerium.pt/files/kurivowavux.pdfIn PDF document text
    • http://gongotour.com/FileData/ckfinder/files/20210914_64D46B634601B5F2.pdfIn PDF document text
    • http://jl-vacuum.com/upload/files/repixekewivivex.pdfIn PDF document text
    • http://thueotodn.com/uploads/image/files/fubogozekelupo.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c689519abe---82166738745.pdfIn PDF document text
    • http://universalgroupautos.com/files/others/18598718863.pdfIn PDF document text
    • http://cameradungphat.com/uploads/files/buwatu.pdfIn PDF document text
    • http://swiftnb.com/ckfinder/userfiles/files/kewesusojuwikekavelor.pdfIn PDF document text
    • http://hyundai-baoloc.com/luutru/files/xexenekusuworufolal.pdfIn PDF document text
    • https://bomberosdenavarra.com/userfiles_nexo/files/peniviligupefa.pdfIn PDF document text
    • http://projecthouse.bg/uploads/CKfinder/files/jeripugovumikigulowafasow.pdfIn PDF document text
    • http://huiking.cn/uploads/file/162229057521.pdfIn PDF document text
    • https://franchisefarm.franchiseharbor.com/files/files/tosokejureribi.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f928933098---levutaj.pdfIn PDF document text
    • https://garraldaarquitectura.com/garralda_userfiles/files/rojukonababebevuwojusew.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_off0000e98d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE98D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001019f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1019F 17716 bytes
SHA-256: 9ad3b672239085e4f5739d6d8bbb6221b69b57cd1c63770db2c71ff2a21d312b
font_02_sfnt_off00012ff5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FF5 10140 bytes
SHA-256: e947a3cc87ba58092077c47c1b164cb67a1742d5320da008e0af3ad971023b92

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