Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d07339b50e3678c…

MALICIOUS

PDF

72.0 KB Created: 2021-09-24 12:20:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 3a9526d4bcf66cc940ffb3f38b553f1b SHA-1: 6b5c38c5da195073a01fb74a480696b4acbbc30a SHA-256: 5d07339b50e3678c427e662f611eccb1ba283f006113bfd68137f09e45d0767b
126 Risk Score

Malware Insights

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

The sample was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs pointing to various domains, suggesting a link farm or redirection mechanism. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly indicates this is not a legitimate document but rather a tool for SEO manipulation or distributing further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://ellev.fr/upload/files/738500529.pdf In PDF document text
    • http://cephedanismani.com/images/pages/file/22990386778.pdfIn PDF document text
    • http://stroyindustry.com/userfiles/file/negepilanagawupivemademo.pdfIn PDF document text
    • https://aptitudeclass.com/ckfinder/userfiles/files/jaxawojizoroxabasukepawes.pdfIn PDF document text
    • http://xecuoihuyhoang.com/uploads/userfiles/file/96971531694.pdfIn PDF document text
    • https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/6c5ff42fb21797991c1e1ee45a22e469/zidedutokokirobituva.pdfIn PDF document text
    • https://ltes.tw-goods.com/UserFiles/files/22157250061.pdfIn PDF document text
    • https://tommytest.dish1314.com/data/html_editor/files/dixefepizivura.pdfIn PDF document text
    • http://materialdeestudo.top/userfiles/files/livoxitulopinugiderig.pdfIn PDF document text
    • http://kaus21.com/userData/board/file/54794994374.pdfIn PDF document text
    • https://oykufestivali.com/ckfinder/userfiles/files/wixiladoxolakuzutaru.pdfIn PDF document text
    • http://huyminhplastic.com/upload/files/66336294772.pdfIn PDF document text
    • http://gmei.lt/ckfinder/userfiles/files/famev.pdfIn PDF document text
    • https://montpellier-business-plan.com/mbp/upload/images/images/upload/ckfinder/wowipidi.pdfIn PDF document text
    • http://www.sunriseacademy.in/ckfinder/userfiles/files/86808809266.pdfIn PDF document text
    • https://sikdercollegeofpharmacy.com/scp/ckfinder/uploads/userfiles/files/39052964346.pdfIn PDF document text
    • http://www.specemc.ru/upload/files/82770813059.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/1613edf1b2fabe---bufejuz.pdfIn PDF document text
    • http://chnli.tw/CKEdit/upload/files/pajoboviseni.pdfIn PDF document text
    • https://kccegis.com/upfiles/content/file/20210914135448.pdfIn PDF document text
    • https://supermagnum-bg.com/ckfinder/userfiles/files/30216439967.pdfIn PDF document text
    • https://propiedades.net/ckfinder/userfiles/files/11633497798.pdfIn PDF document text
    • https://pensiuneavalentina.ro/app/webroot/file/jejewabaregadinif.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=borat+2+putlockerPDF 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_off0000b83c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB83C 16616 bytes
SHA-256: 9e44e5a5bbf4c2711ae658c2c8313c17d264b676163ea778d031ef1eb2ac176a
font_01_sfnt_off0000e2fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2FE 10368 bytes
SHA-256: e76158d4ee06db7339fb7a63b7d0849c9c1db9e418d373a096327536f5ad774f
font_02_sfnt_off0000fabb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFABB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1