Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0fe7e721fd660bd…

MALICIOUS

PDF

81.2 KB Created: 2021-09-23 06:48:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 1fa0c3191ef53f1eed3c70c261ead285 SHA-1: dae5008907dd598a877c37defabd4e5a559f4a78 SHA-256: a0fe7e721fd660bdae976e81f6ccb32f945ef80fed3bb910bc60e04f85170e79
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of embedded URLs, many of which point to disposable domains and are likely used to redirect users to malicious sites. The presence of numerous links suggests a link farm or phishing campaign designed to distribute further malware or steal credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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 http://luijkzonwering.nl/image/file/derupimefuwi.pdf In PDF document text
    • https://adtw1.elfjane.com/ckfinder/userfiles/files/figoranobanomofuxat.pdfIn PDF document text
    • http://domadoma.cz/userfiles/file/tutezigalopopodifepa.pdfIn PDF document text
    • https://medtek.vn/storage/file/94802086978.pdfIn PDF document text
    • https://fertilizergranulatorprice.com/d/files/20424812647.pdfIn PDF document text
    • http://hoshitorionline.com/uploads/files/katuvelologinoxotinir.pdfIn PDF document text
    • http://cinebuzz.be/uploads/userfiles/files/27257172102.pdfIn PDF document text
    • http://uptownchantilly.com/uploads/files/96567440389.pdfIn PDF document text
    • http://martonaroniskola.net/userfiles/file/gusesufopuxavamupademi.pdfIn PDF document text
    • http://ceramicaartisticamarsalese.it/userfiles/files/14347433649.pdfIn PDF document text
    • http://vivaldiskibus.com/FileData/ckfinder/files/20210912_2E53E71FAC07106B.pdfIn PDF document text
    • https://remoteyourstaff.com/calisma2/files/uploads/numiwabox.pdfIn PDF document text
    • https://producedepot.us/userfiles/files/juderedepu.pdfIn PDF document text
    • http://indianspringhomes.net/userfiles/files/zinulurawe.pdfIn PDF document text
    • https://bike-accessories.supersites.gr/content/ckfinder/files/13376657617.pdfIn PDF document text
    • https://stvietnam.net/luutru/files/sojafube.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134081845224---70439263946.pdfIn PDF document text
    • https://iword.de/userfiles/file/5950045363.pdfIn PDF document text
    • https://getadoc.in/ckfinder/userfiles/files/30117910320.pdfIn PDF document text
    • https://speculatio.in/userfiles/file/12552163010.pdfIn PDF document text
    • http://debnine.net/UserFiles/File/witixupiviforuv.pdfIn PDF document text
    • http://compow.net/ckfinder/userfiles/files/degilaxunexekaxofiso.pdfIn PDF document text
    • http://orel-trinity.ru/sites/default/files/file/58927008962.pdfIn PDF document text
    • http://korio-olsztyn.pl/userfiles/file/teguba.pdfIn PDF document text
    • http://el-system.jp/uploads/2012/files/mujukakazexelemuju.pdfIn PDF document text
    • http://polenes.cl/userfiles/file/xibumosixojekade.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=the+martian+2015+full+movie+hd+1080pPDF 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_off0000d387.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD387 18804 bytes
SHA-256: 07b9ad49f80489d536920608fb591c70ee23a39584c8984a7ad2ad17da604ca5
font_01_sfnt_off0001040b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1040B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011c22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C22 11360 bytes
SHA-256: 20dbf771dc520842323bad4e68c24738cd6574ba0deaf283201fa640cdd9be79

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