Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f8e0555abb3be25…

MALICIOUS

PDF

72.0 KB Created: 2021-09-16 11:46:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 04bcf36386d38cea92abf87ba53ad009 SHA-1: a776a4ceb796b5110b4b5c2fdb564e9ce16ca254 SHA-256: 6f8e0555abb3be25872ec294b5eaaefc9ff81e380d7223b24eaabd39dac3a5de
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample is a PDF file detected as malicious by ClamAV and an ML classifier. It contains embedded JavaScript and a significant number of external URIs pointing to disposable hosting, indicative of a link farm used for phishing or redirecting to malicious content. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, identifying it as a link farm on disposable hosting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://drafthe.ru/uplcv?utm_term=driven+season+1+episode+7 PDF link annotation
    • https://airflow-skateboards.com/userfiles/files/23905171137.pdfIn PDF document text
    • http://pk.mo/userfiles/file/44252709885.pdfIn PDF document text
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/hcue1qp194n1dd0pl742hvcnrc/27516189502.pdfIn PDF document text
    • http://xn--3e0b556bhrbowi6undva.com/ckupload/files/netefes.pdfIn PDF document text
    • http://longbienco.com/js/ckfinder/userfiles/files/namigetub.pdfIn PDF document text
    • https://movingalpsfoundation.ch/userfiles/file/wuxolufuwugakegenevanoso.pdfIn PDF document text
    • http://veterina-hrib.cz/user-uploads/files/99895290159.pdfIn PDF document text
    • http://maturitni-ples.eu/UserFiles/File/podeloxemibibeg.pdfIn PDF document text
    • https://oilbasaro.com/web/images/ckfinder/files/20210906135937.pdfIn PDF document text
    • http://zaintik.org/files/galeria/files/60295091650.pdfIn PDF document text
    • http://mosvag.ru/img/lib/file/76198038080.pdfIn PDF document text
    • http://islaminkiel.de/webmisr/uploadwebmisr/file/68091129265.pdfIn PDF document text
    • https://tch.lu/files/files/38131828980.pdfIn PDF document text
    • http://thegioidahoacuong.com/uploads/image/files/88543719665.pdfIn PDF document text
    • https://betsin.org/userfiles/files/folofud.pdfIn PDF document text
    • http://swancentive.com/cote_dor_import/admin/ckfinder/userfiles/files/40745066862.pdfIn PDF document text
    • https://cungcapthitdetuoi.com/app/webroot/files/images/pages/files/sumifonekinijo.pdfIn PDF document text
    • https://gad-elhak.com/userfiles/file/vujemekupujepox.pdfIn PDF document text
    • https://divinenine.net/userfiles/file/15696525370.pdfIn PDF document text
    • http://dasbluemchen.com/lowarizeloxigeli.pdfIn PDF document text
    • http://rcmo.ru/upload/files/87869056856.pdfIn PDF document text
    • http://guchen.ru/d/files/purubexuxele.pdfIn PDF document text
    • http://www.hgbehringer.de/img/files/files/61196676416.pdfIn PDF document text
    • https://b2cexpressdemo.com/userfiles/file/fugikovu.pdfIn PDF document text
    • http://haozuowenwang.com/imagefiles/file/zatiresorofabo.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_off0000b897.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB897 10408 bytes
SHA-256: 8cc1eedf0b00c91eafaf854f4d4ce53e11441894878d66c7383cef05e67ed981
font_01_sfnt_off0000d060.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD060 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e872.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE872 16500 bytes
SHA-256: a0a19f74f39a5d90e6eaf82ed49e237ae25922f440e20c55c64fafa59a8ae690

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