Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf0b9b2e942c88f5…

MALICIOUS

PDF

70.2 KB Created: 2021-10-03 05:07:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 649122a33e5db8a6ca279fa1cc9f79df SHA-1: 75c767b1c8a9b1acadd843761aa9e608a977b02b SHA-256: bf0b9b2e942c88f5de320fed1c73ed93dd2b03bfba3d4ba7a9cb7b420bffe0fd
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, with a heuristic identifying it as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and URL patterns suggest it's designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://sriraghavendratemple.com/ckfinder/userfiles/files/91511426189.pdf In PDF document text
    • http://cesurmakina.com/userfiles/file/xedijen.pdfIn PDF document text
    • http://airmon.hu/images/files/38726043919.pdfIn PDF document text
    • https://infrastone.com/userfiles/files/24849148354.pdfIn PDF document text
    • http://teraval.cz/res/file/40217389110.pdfIn PDF document text
    • https://jmcoverseaspvtltd.com/uploads/files/59251891112.pdfIn PDF document text
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/hbufbgg9lk4b5nl4volqtvcr7j/14281018578.pdfIn PDF document text
    • http://travelcenterpuntos.com/campannas/file/90803623312.pdfIn PDF document text
    • http://linker-apps.com/files/jozovesanesof.pdfIn PDF document text
    • http://jmdfhjl.com/fckeditor/userimages/file/47279276177.pdfIn PDF document text
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/d1e61ce9bb07391bbfa21c34952fc2d2/ludukilorilezujame.pdfIn PDF document text
    • http://sun-green.be/ckfinder/userfiles/files/73128128161.pdfIn PDF document text
    • https://motty-etai-sharon.com/files/files/vokiniwefexagovixobawipo.pdfIn PDF document text
    • http://medeeatour.ro/mm/file/febosobavazidi.pdfIn PDF document text
    • http://aldo-ins.com/userfiles/file/muruxuz.pdfIn PDF document text
    • http://vasset.bg/userfiles/file/14948810510.pdfIn PDF document text
    • http://stopguepes72.fr/userfiles/file/labin.pdfIn PDF document text
    • http://www.focitabor.hu/userfiles/file/biwaxedijufetinefo.pdfIn PDF document text
    • http://grandwatergatehotel.com/upfile_hotel/files/88672913847.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=morphological+classification+of+anemia+pdfPDF 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_off0000adb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xADB5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c5cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5CC 11060 bytes
SHA-256: de257e6c85afd2dac061b6a8552f0f9d97cdd4907ab82ee70c79c4f626197d7e
font_02_sfnt_off0000df28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF28 17424 bytes
SHA-256: 99f419e2809fb3351b7b38335bb99bde9de5b55b38bcdf558ac6c2b3305baefe

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