Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b7d853fd9f88533…

MALICIOUS

PDF

92.3 KB Created: 2021-09-14 14:03:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 8565dd291c2c331f6acb951ad4cde7a8 SHA-1: bfcf5d043af7ef7410832e921e2fc6de81f875d8 SHA-256: 1b7d853fd9f88533019c8c0f04a66ac8faa05b1a94de1bcce4569c65dd4e5c94
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. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document contains numerous links to disposable hosting, suggesting a phishing or redirection scheme. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards an attempt to direct users to external, potentially malicious, content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://alteanetworks.fr/img/file/fosekiwigakew.pdf In PDF document text
    • http://123podkrovie.sk/editor_uploads/files/98781422867.pdfIn PDF document text
    • https://ryokanclub.com/FileData/ckfinder/files/20210909_EDCBE25884542424.pdfIn PDF document text
    • http://residenzaeden-albisola.com/userfiles/files/murolelekekevuzezu.pdfIn PDF document text
    • https://habrit.tw/ckfinder/userfiles/files/83615557216.pdfIn PDF document text
    • https://behbehaniprojects.com/uploads/files/burosuneligaditofokawokij.pdfIn PDF document text
    • http://alarmy-kamery24.pl/userfiles/file/rujunagivemitadefoloz.pdfIn PDF document text
    • http://a-aqua.fr/ressource/site-image/files/86085896858.pdfIn PDF document text
    • http://liebherr-tr.com/userfiles/file/zorofibosidobovevowaz.pdfIn PDF document text
    • http://j1ent.com/userfiles/file/20210914073200.pdfIn PDF document text
    • http://aliceinformaticasrl.com/user/pages/xalosefowofire.pdfIn PDF document text
    • http://plechotice.sk/tmp/file/13519061834.pdfIn PDF document text
    • https://tpijobportal.com/ckeditor/ckfinder/userfiles/files/garobage.pdfIn PDF document text
    • http://wxbeimei.cn/upload/ckimg/files/202109130303067606.pdfIn PDF document text
    • https://art4you.sk/editor_uploads/system/files/poxafalavaritukeweror.pdfIn PDF document text
    • http://lyzjkgm.com/d/files/79283286841.pdfIn PDF document text
    • https://snowcat.pl/admin/ckfinder/userfiles/files/17768994255.pdfIn PDF document text
    • http://belv.ru/userfiles/file/tiniveratulovuko.pdfIn PDF document text
    • http://noithatmfc.com/media/ftp/file/tugojadafen.pdfIn PDF document text
    • http://zhxndl.com/uploadfiles/files/93700136352.pdfIn PDF document text
    • https://taxforce.nl/userfiles/files/80538880479.pdfIn PDF document text
    • http://thegioimercedes.com/upload/files/gutivonowiribazo.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/16133b94538a24---40972668027.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=how+can+you+detect+spyware+on+your+phonePDF 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_off0001035c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1035C 18288 bytes
SHA-256: a3533d37128a8b3dcf0d2e57fdfffddb329a4be99a96e9ddfd0970e01039685f
font_01_sfnt_off00013284.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13284 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014a9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A9B 10764 bytes
SHA-256: b0c4ae4fbe2fe2296e518774028226acbe4a13ed6d58fb67bfbaa65e18c3ac46

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