Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f23d7801f4b7344…

MALICIOUS

PDF

85.0 KB Created: 2021-10-05 17:05:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 59ab72d279fe0cb4a3abc3b9cf0521eb SHA-1: 98fad8ab703b23aecf5abd2b73c1735e90538ac2 SHA-256: 7f23d7801f4b7344d8c5dc8b36258e364d0ae80fb4b568e19790ebca3c61b19e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and is flagged as a link farm on disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were extracted, the presence of embedded URLs and the nature of the heuristics point towards a malicious document designed to redirect users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://irlanc.ru/uplcv?utm_term=angioplasty+and+stent+placement PDF link annotation
    • https://eastmangroupllc.net/ckfinder/userfiles/files/14831772582.pdfIn PDF document text
    • http://testplanet.nl/uploads/files/41520556040.pdfIn PDF document text
    • http://startmatbaa.com/userfiles/file/motewo.pdfIn PDF document text
    • http://poultech.net/d/files/votama.pdfIn PDF document text
    • http://security-m.jp/tool/images/file/dibuwibidoka.pdfIn PDF document text
    • http://szigmetal.hu/editor_up/jufus.pdfIn PDF document text
    • https://biorenta.lt/ckfinder/userfiles/files/lidixolubobumopubotexijub.pdfIn PDF document text
    • https://bandotrading.it/uploads/file/rawigojotogiviwuz.pdfIn PDF document text
    • http://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/16149a1875905b---bubuzes.pdfIn PDF document text
    • http://heaig.org/editor/ckfinder/userfiles/files/kipuvudegeroki.pdfIn PDF document text
    • http://htwy.com/upload/file/zixexorifupimozebij.pdfIn PDF document text
    • https://liepasmuiza.lv/userfiles/library/varodinipem.pdfIn PDF document text
    • http://parateam.cz/file/kusasukatax.pdfIn PDF document text
    • https://wlao.on.ca/wp-content/plugins/super-forms/uploads/php/files/fa532de999bf46d83da28c399ba99202/fipoxobam.pdfIn PDF document text
    • http://civicwomen.com/ckfiles/files/tutewirodafegiduli.pdfIn PDF document text
    • https://nothingbutsafetyglasses.com/userfiles/file/negufenevi.pdfIn PDF document text
    • http://ilonew.tasksplan.com/ckfinder/userfiles/files/49724490342.pdfIn PDF document text
    • http://wellnesszeewolde.nl/site/data/ws/files/repebujepefapasuwiju.pdfIn PDF document text
    • http://studioferrato.it/userfiles/files/46555629676.pdfIn PDF document text
    • https://globalcircle.club/userfiles/file/xipenamiba.pdfIn PDF document text
    • http://busangh.com/attfile/fckimg/file///20210901122228_888691524.pdfIn PDF document text
    • http://allgeology.ru/ckfinder/userfiles/files/tiwebig.pdfIn PDF document text
    • http://wpchkg.com/upload/image/file/jebamigus.pdfIn PDF document text
    • http://abhinavabhishad.org/userfiles/file/55295120091.pdfIn PDF document text
    • http://ozanatalan.com/iboard/includes/userfiles/files/pusimena.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_off0000e540.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE540 18700 bytes
SHA-256: 34bbad354f0e31a0120a8827f168bcab3ba894e70d084d8367866166aa001200
font_01_sfnt_off000114f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114F8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012d0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D0F 10852 bytes
SHA-256: 82f6ece382194bb8c6055f4509e15b609c9962807bef61302df1b8f4667586be

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