Malicious PDF — malware analysis report

Static analysis result for SHA-256 f24d5e0f7aac2b2a…

MALICIOUS

PDF

82.2 KB Created: 2021-09-09 08:33:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: beef3b2d911da65be7faec9764f4469d SHA-1: 43df9d15726955036aef7d76df6b4958ad111f97 SHA-256: f24d5e0f7aac2b2abc819a82e7505feeab541431c771eb68446d1bd37b00d050
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are part of a link farm hosted on disposable domains or IP addresses, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or delivering a secondary payload. No scripts were extracted, but the structure and URL patterns are indicative of a downloader or phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 http://holzweiss.at/bekojirunamakawowu.pdf In PDF document text
    • http://fcraregistration.com/UploadedData/file/87531282600.pdfIn PDF document text
    • http://140.121.180.103/ckfinder/userfiles/files/51777918318.pdfPDF link annotation
    • https://www.esfa.bg/root/ckfinder/userfiles/files/96160701457.pdfIn PDF document text
    • https://zahrek.com/userfiles/file/78874550703.pdfIn PDF document text
    • http://epwuae.com/userfiles/file/79280918442.pdfIn PDF document text
    • http://versobrokers.eu/userfiles/files/bekesedalaxawidipan.pdfIn PDF document text
    • http://mpwlawpa.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/giwejeselojabalaviju.pdfIn PDF document text
    • http://automsystem.com/UploadFile/file/20210906214650886.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/16131859b9ee0a---29825982518.pdfIn PDF document text
    • http://hockjoohin.com/admin/uploads/file/88577378856.pdfIn PDF document text
    • http://nexxosrealty.com/userfiles/files/monolego.pdfIn PDF document text
    • https://birudongker.com/contents/files/96507924124.pdfIn PDF document text
    • http://aliguoriarchitetto.eu/userfiles/files/vufiwosobubavasu.pdfIn PDF document text
    • http://nscenter.cn/upload/files/31352386962.pdfIn PDF document text
    • http://ajivikafinance.com/userfiles/file/sitepobad.pdfIn PDF document text
    • https://valerart.com/ckfinder/userfiles/files/5175471735.pdfIn PDF document text
    • http://bigbulkbags.ahmadpackages.com/survey/userfiles/files/xaxele.pdfIn PDF document text
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/1612fecea30d2c---jubelaguwalikupevasasopo.pdfIn PDF document text
    • http://bakineshr.az/ckfinder/userfiles/files/ninukadozun.pdfIn PDF document text
    • http://www.roosprommenschenckelfoundation.nl/ckfinder/files/files/mopuvofopuroxu.pdfIn PDF document text
    • http://mjengo.org/FCKeditor/editor/filemanager/connectors/php/connector.php?Command=FileUpload&Type=File&CurrentFolder=%2Ffile/6726475514.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=the+world+3+rise+of+demon+downloadPDF 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_off0000d953.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD953 18852 bytes
SHA-256: 36525261a09aef322ee4ac79454f5571879d3ce9539ca436e4dd91af8cf426a1
font_01_sfnt_off00010a5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A5D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012274.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12274 10740 bytes
SHA-256: 316cad6df771ac1bc428b2490691d792fe01f38dedc51da382f8c5277f0efade