Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b6d6dff30b38108…

MALICIOUS

PDF

77.8 KB Created: 2021-10-10 04:00:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: cd8c1d85707c06f88e73a5815b04d966 SHA-1: 570923e76d105c4bf542d98b55504c97ea7288c4 SHA-256: 4b6d6dff30b38108e0704d853ad405a8f71708011704c3d24f686c5f41ed49c4
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to potentially malicious PDF files hosted on various domains, suggesting a link farm or redirection scheme. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports the idea that the document is designed to funnel users to external, potentially harmful, content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://mma-montessori.com/admin/ckfinder/userfiles/files/tejagasodofowirax.pdf In PDF document text
    • http://catherine-massage.com/ckfinder/userfiles/files/72346109162.pdfIn PDF document text
    • http://hotelgiottotorino.com/userfiles/files/34362769885.pdfIn PDF document text
    • https://lanegarrett.net/userfiles/file/57134026957.pdfIn PDF document text
    • http://studioguatta.it/userfiles/files/nekusibofisosaxirile.pdfIn PDF document text
    • https://tradegateindia.com/userfiles/file/gojos.pdfIn PDF document text
    • https://mimpishio2.net/contents/files/98715090024.pdfIn PDF document text
    • https://ph789.com/pinhsuan/files/file/ruruxizaxikefig.pdfIn PDF document text
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/1615094a589cee---nezokor.pdfIn PDF document text
    • http://ainut.fi/userfiles/file/vigepizumekebasano.pdfIn PDF document text
    • http://krakow4you.pl/krakow/files/sofufekeneg.pdfIn PDF document text
    • https://dolphinsolutions.net/ckfinder/userfiles/files/jixipojojotewav.pdfIn PDF document text
    • http://neuchina.org/userfiles/file/74161841526.pdfIn PDF document text
    • http://startmatbaa.com/userfiles/file/91035777884.pdfIn PDF document text
    • https://1am130r6h1n1-k11a7.com/contents/files/85968600107.pdfIn PDF document text
    • http://fernandopelosini.it/userfiles/files/dabaralekoparawesixez.pdfIn PDF document text
    • http://enidental.com/userfiles/file/20210914041735.pdfIn PDF document text
    • http://vonschickenfremont.com/uploads/files/36650598225.pdfIn PDF document text
    • https://spbmworld.com/anaeter_capital/siteadmin/userfiles/files/zeposorafavegofinosola.pdfIn PDF document text
    • https://promptcorporate.com/ckeditor/ckfinder/userfiles/files/wojavomiz.pdfIn PDF document text
    • http://vitalenzyme.com/uploads/fckupload/file/63909317674.pdfIn PDF document text
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161508e66b9a75---vojuwix.pdfIn PDF document text
    • http://ccsctda.com/ckfinder/userfiles/files/20210919_110919.pdfIn PDF document text
    • http://ave-france.com/pics/files/nagejaxowenizojamerasebak.pdfIn PDF document text
    • https://karlholmbygg.se/UserFiles/files/91979307983.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=simple+tenant+agreement+formPDF 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_off0000cc23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC23 10608 bytes
SHA-256: 00fd30eead5f0b83bcd063cb250f4267c64473436f2f772318ce5e8b6ac5cbb1
font_01_sfnt_off0000e453.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE453 17376 bytes
SHA-256: f4fe8df0803fc0efe293bd491bd18c937807acad58d013f0112e5117d82a5ae3
font_02_sfnt_off0001112e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1112E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1