Malicious PDF — malware analysis report

Static analysis result for SHA-256 2fb685b17bc33598…

MALICIOUS

PDF

82.8 KB Created: 2021-09-19 19:20:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 52e22d2e3bf20ec3ee11021cc37de329 SHA-1: 2719f6cb7ab3e0138c368eafd32e6cac6a3b7c4f SHA-256: 2fb685b17bc33598b7849f4304f13944616cae690d0ab0e8233887e315cdd1b0
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple embedded URIs pointing to external websites, with one heuristic specifically identifying it as a link farm on disposable hosting. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://catamma.ru/uplcv?utm_term=configurar+dvr+giga+acesso+remoto+android PDF link annotation
    • http://4bx.pl/public/file/10147170254.pdfIn PDF document text
    • http://locum-system.pl/userfiles/file/serilewi.pdfIn PDF document text
    • https://suacuacuontoanphat.com/upload/files/jazepuno.pdfIn PDF document text
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/0fa9a5c7fc9b52a5548923a8703424ee/labedixovo.pdfIn PDF document text
    • https://processwork.archerhuang.com/ConImg/files/berurakakula.pdfIn PDF document text
    • https://citrasas.com/ckfinder/userfiles/files/25234044950.pdfIn PDF document text
    • http://idealthailand.com/file_media/file_image/file/kosugixob.pdfIn PDF document text
    • https://wickedcheesy.com/images/file/susogogegowagiwimamusemaw.pdfIn PDF document text
    • https://dom4m.de/userfiles/files/32558585468.pdfIn PDF document text
    • https://dcoderesearch.com/uploads/govomidotukuxo.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/1613468b815021---62483101337.pdfIn PDF document text
    • http://fjsxsx558.com/upload/files/71863987935.pdfIn PDF document text
    • https://patc.fr/imagesfile/10055438880.pdfIn PDF document text
    • http://vako.vn/app/webroot/uploads/files/diguwoxozawob.pdfIn PDF document text
    • https://parquesanalbertohurtado.cl/ckfinder/userfiles/files/99893101692.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613690a781009---43426536715.pdfIn PDF document text
    • http://talani.nl/userfiles/image/file/libalapin.pdfIn PDF document text
    • http://140.121.180.103/ckfinder/userfiles/files/54696403984.pdfPDF link annotation
    • http://hotelamadeustorino.com/userfiles/files/33677552352.pdfIn PDF document text
    • https://www.food-equipment-store.com/fckeditor/uploads/file/23026590679.pdfIn PDF document text
    • http://www.stadion-zarya.ru/ckfinder/userfiles/files/zovezamexeko.pdfIn PDF document text
    • http://dptour.net/bot/ckfinder/uf/files/30496885739.pdfIn PDF document text
    • http://gabinetpro.gabinetpro.pl/kosmetyczka/krakow/files/16092802652.pdfIn PDF document text
    • http://turar-mussin.com/userfiles/File/51786769692.pdfIn PDF document text
    • https://www.bmo-agencement.fr/ckfinder/userfiles/files/tatawenimunasi.pdfIn PDF document text
    • http://sushibelovo.ru/files/jikokotunemavozaz.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_off0000d6fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6FC 19428 bytes
SHA-256: 6de337a06fad2b723637c0b7c47ca48d37631675c69c8a26840086f785ff75ec
font_01_sfnt_off00010aa5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AA5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000122bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122BC 10972 bytes
SHA-256: af1cd56f466dc02276ac9d61ae3a48dcae8a4846b423acb09b2134ec3e6a983c