Malicious PDF — malware analysis report

Static analysis result for SHA-256 1253f25987cf537a…

MALICIOUS

PDF

85.9 KB Created: 2021-09-09 22:10:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 7ae965d1c37fca51bc3f5b5434d99fb2 SHA-1: e49d531e1478f9b94cfdc88c513619c1cda07388 SHA-256: 1253f25987cf537aa9c76bba68a6a450470fcaf062dcaed52acb46a225e19e00
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic suggests it functions as a link farm, directing users to numerous external domains, which is a common tactic for phishing or distributing further malware. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristics point towards an attack pattern involving redirection to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://zenit-npk.ru/files/file/19274731991.pdf In PDF document text
    • https://loffoxfitness.mvwebsolution.com/userfiles/files/rozuxor.pdfIn PDF document text
    • https://satellietgroep.nl/userfiles/files/24807478916.pdfIn PDF document text
    • http://inbjnews.com/data/cheditor/0603/files/mebotizajeguzezabezeduja.pdfIn PDF document text
    • http://www.psyforyou.nl/upload/fckeditor/file/bezapinutubajurivuwin.pdfIn PDF document text
    • http://harnettcountyhba.com/userfiles/file/40103786688.pdfIn PDF document text
    • http://xn--9i1b14lwsg1seumdzsx.com/upload/fckeditor/file/vufoxejejenejuku.pdfIn PDF document text
    • http://auto4-spb.ru/public/images/ckfinder/files/favugitiwe.pdfIn PDF document text
    • https://curewelldiabetes.com/userfiles/file/88242990492.pdfIn PDF document text
    • http://cy2hand.com/userfiles/26144966958.pdfIn PDF document text
    • http://cariboohose.com/userfiles/file/jalofenemalajur.pdfIn PDF document text
    • http://sunpix.ru/img/lib/file/23212072697.pdfIn PDF document text
    • https://icicle-mountaineering.ltd.uk/ckfinder/userfiles/files/73291130459.pdfIn PDF document text
    • https://bohemiamaestro.com/webpagebuilder/ckfinder/userfiles/files/vutitasipamez.pdfIn PDF document text
    • https://ecpa.fr/uploaded/file/99530813641.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/1613a024018439---tekemijofewofexitu.pdfIn PDF document text
    • https://takipcisec.com/calisma2/files/uploads/gatumuxefatarutopijak.pdfIn PDF document text
    • http://manilag.com/FileData/ckfinder/files/20210908_0E8E1CBB6156968C.pdfIn PDF document text
    • http://bk-plus.at/userfiles/files/71244998347.pdfIn PDF document text
    • https://propertiproperty.com/Uploads/userfiles/files/bugovisurosatofiluwigakek.pdfIn PDF document text
    • https://portugaliaimagyarok.com/ckfinder/userfiles/files/33554061993.pdfIn PDF document text
    • http://the-bom.kr/upfile/files/96417315645.pdfIn PDF document text
    • https://bartonsteel.com/tony/barton/ckfinder/userfiles/files/denewikawisawovokijak.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=setup+iptv+on+firestickPDF 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_off0000e9d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9D2 10600 bytes
SHA-256: ee7a6e9fd1ac25a587597f0660d5b6d75dec7adb2699672277796e3e5e8c2b6d
font_01_sfnt_off00010231.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10231 18484 bytes
SHA-256: 1ddc22bace0100c292a1ae22c1ffba18c96dad98e40e483a005188f76ac29bd7
font_02_sfnt_off00013219.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13219 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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