Malicious PDF — malware analysis report

Static analysis result for SHA-256 beddd529bc3ebf0c…

MALICIOUS

PDF

70.2 KB Created: 2021-09-28 17:47:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 3438fee8f8343198b4ada766c5f864ea SHA-1: 798741dd6f4b78567fe20312332445a0dcdbe7d9 SHA-256: beddd529bc3ebf0c0e3a1d4407a878b96cbf3737b2bc7985b7d652b730301192
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external URLs, many of which are hosted on disposable domains, indicating a link farm designed to redirect users to malicious content. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, identifying the document as a link farm on disposable hosting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://coretry.ru/uplcv?utm_term=how+to+take+screenshots+on+android+tablet PDF link annotation
    • https://flims.atelierleuthold.ch/userfiles/files/26553669434.pdfIn PDF document text
    • http://15449010.com/FileData/ckfinder/files/20210913_DFD6722CC886CD8B.pdfIn PDF document text
    • https://kisikana.hr/UserFiles/files/25244117447.pdfIn PDF document text
    • http://elskenecologie.nl/files/xisuzugigo.pdfIn PDF document text
    • http://anthonyjcincottalaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/mefusonejotolowaj.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/161335219affd8---60222836648.pdfIn PDF document text
    • https://www.hippocratio.gr/ckfinder/userfiles/files/jefasududa.pdfIn PDF document text
    • https://tylbm.com/Upload/ckeditor/files/59680059030.pdfIn PDF document text
    • https://777mto.org/contents/files/netor.pdfIn PDF document text
    • https://ecableapp.com/FCKeditor/FCKimgUpload/file/52018061782.pdfIn PDF document text
    • http://pc75.net/upfiles/file/1631244229.pdfIn PDF document text
    • http://rockhousemethod.com/ckfinder/userfiles/files/93914180805.pdfIn PDF document text
    • https://baglab.pl/galeria/file/gosewenozivenak.pdfIn PDF document text
    • http://moneymaker-gold.de/files/70956041324.pdfIn PDF document text
    • http://gidromall.ru/img/uploads/file/21532035173.pdfIn PDF document text
    • http://aa-nusd.jp/80840071068.pdfIn PDF document text
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c47f96c1d5---40279380647.pdfIn PDF document text
    • http://gewald.ru/content/Files/lojijamawezexemipijozaba.pdfIn PDF document text
    • http://onroerendgoedindex.nl/images/uploads/kifikix.pdfIn PDF document text
    • http://sjar-tech.com/uploadfile/file///2021092106130127.pdfIn PDF document text
    • https://prosaison.fr/userfiles/files/39484522979.pdfIn PDF document text
    • http://gzpropellers.com/uploadfile/files/majifigimifopemokizumelo.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_off0000ae24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE24 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c636.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC636 17272 bytes
SHA-256: 46f672a97f0309c7a74db1aba8ea1d080b579a4e7526516a43dae460bc6deecc
font_02_sfnt_off0000f2cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2CB 10776 bytes
SHA-256: 127f5cec68ff19c25b4d5f31600ee6332430cf5eabdf1c058798b701bf28e176

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