Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5e39edad562f7f9…

MALICIOUS

PDF

79.1 KB Created: 2021-09-16 06:51:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 5a36c9b215581751bf228fdc447f875b SHA-1: 75a620ce54e004d6f01b88402d960b0688005c1f SHA-256: a5e39edad562f7f9b06adbd5b79b0114330c6526388e987aa7881300c13cb236
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 embedded URLs, many pointing to disposable domains, and is identified as a link farm. The presence of external URIs and the overall structure suggest an attempt to redirect users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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 http://sportservistocik.cz/UserFiles/File/malaxabadajudezupi.pdf In PDF document text
    • http://iktoktatas.hu/files/file/94637353073.pdfIn PDF document text
    • http://www.satit.nrru.ac.th/satit/_Adminis/ckfinder/userfiles/files/bafaja.pdfIn PDF document text
    • http://kperrylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/73540549491.pdfIn PDF document text
    • https://aspirans.com/files/file/zidajaripidu.pdfIn PDF document text
    • http://co-wemart.com/careeruserfiles/file/21818139305.pdfIn PDF document text
    • http://firewaterdamagedfw.com/test/fckeditor/uploadfiles/file/13865665076.pdfIn PDF document text
    • http://sloplast.com/userfiles/files/71000711609.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/rs6mr4oqk5gb1kjh21nhe3v75j/xosor.pdfIn PDF document text
    • https://onhimalayas.com/ckfinder/userfiles/files/xirirejetukunowazerogus.pdfIn PDF document text
    • http://soldearenales.com/galeria/files/zijikof.pdfIn PDF document text
    • http://giaydantuongphongngudep.com/images/news/file/kirakejujevanegovezag.pdfIn PDF document text
    • http://xn--brneneskontor-landsforening-b0c.dk/userfiles/file/30120158825.pdfIn PDF document text
    • https://dubigroup.com/admin/fckeditor/editor/filemanager/connectors/upload/file/wagojapege.pdfIn PDF document text
    • https://heatingboiler.ca/fck_upload/file/69054568954.pdfIn PDF document text
    • http://ofitecnic.es/files.ofitecnic/fck_up/file/zoxowevuwumozekulugi.pdfIn PDF document text
    • http://baschin-heizung.com/meineBilderAlbertGrundschule/file/35380784124.pdfIn PDF document text
    • http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/8d4c7ea34a5e43b13e76905d1f8d374f/dekukulexar.pdfIn PDF document text
    • http://gyogytornasz.hu/editor_up/50755433649.pdfIn PDF document text
    • https://mlbcsimleague.com/ckfinder/userfiles/files/zuloraxexolotuwi.pdfIn PDF document text
    • http://www.tivafa.hu/upload/file/wetoja.pdfIn PDF document text
    • http://tranhdaquydep.vn/upload/files/kavelemezunokolijakexi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=thief+guard+app+apk+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_off0000d205.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD205 10752 bytes
SHA-256: bc8109ae5889d6b529dece4783e4fb2a51f121f0d5d15a4e1c8aa5f906084747
font_01_sfnt_off0000ea7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA7E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010290.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10290 17420 bytes
SHA-256: a2a5a3727bd68765a7a3e863532a52dd628260f81c21153586cb0b924a717d30

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