Malicious PDF — malware analysis report

Static analysis result for SHA-256 e2b559e9a8a9826f…

MALICIOUS

PDF

81.6 KB Created: 2021-09-20 13:46:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: e73a760aecaffa3d63f3d549f905e8a3 SHA-1: 0c079caeed2199c53e711f8b1bdc558ea11492dd SHA-256: e2b559e9a8a9826fa5166bb9c52749c2892757461db0454a162e14bd2ac4ece4
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded links, many of which are part of a link farm hosted on disposable domains, indicating a phishing or malicious distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a phishing lure designed to trick users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://motelandratecuci.ro/userfiles/file/vawefelobunimudevoga.pdf In PDF document text
    • http://wawa757.com/uploads/files/42521470250.pdfIn PDF document text
    • https://www.moxiclear.com.au/application/third_party/ckfinder/userfiles/files/vukebixeselesox.pdfIn PDF document text
    • http://meteosputnik.ru/userfiles/file/64254841567.pdfIn PDF document text
    • http://folientastaturen.pl/_data/file/digebivadikulimida.pdfIn PDF document text
    • http://archiw.bibliotekalesmierz.eu/img/upload/files/miwokavozalofakafaxex.pdfIn PDF document text
    • http://xn--b1adbbbaeqjtsflbfms0e.xn--p1ai/pict/file/jitogimerudabujop.pdfIn PDF document text
    • http://namlinhchivietnam.net/userfiles/image/file/solasaxege.pdfIn PDF document text
    • http://xn--zb0by3yusal20ak5lcidnwigi.com/ckfinder/userfiles/files/1630817956.pdfIn PDF document text
    • http://hebammenglueck.de/ckfinder/userfiles/files/xuwakiramewisavepunifozi.pdfIn PDF document text
    • http://modernplating.com/userfiles/file/96017999120.pdfIn PDF document text
    • http://krr-nfe.com/suratnfe/UserFiles/File/sakuzuzofoxesinemuwovanab.pdfIn PDF document text
    • https://nacituran.com/userfiles/file/9708662738.pdfIn PDF document text
    • http://xn----1-6cdapb2bdyqawnpcindqfc.xn--p1ai/media/file/lidolowu.pdfIn PDF document text
    • http://longvu.vn/Images_upload/files/nekowusimigedozewog.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/161327ea4551f4---20847188100.pdfIn PDF document text
    • https://trieurodata.ro/images/file/kamipejuza.pdfIn PDF document text
    • https://limberhurstgallery.com/imageuploads/file/39269395544.pdfIn PDF document text
    • http://studiomilano.eu/userfiles/files/55566111227.pdfIn PDF document text
    • https://alteanetworks.fr/img/file/dudadivujep.pdfIn PDF document text
    • http://sreema.org/FCKeditor/file/92496641048.pdfIn PDF document text
    • http://www.jobsincrete.gr/images/_user_na/file/5884747764.pdfIn PDF document text
    • http://ruishikaishi.com/upload/content/files/2021/09/20210908054334.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=download+free+chrome+for+windows+10+64+bitPDF 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_off0000d79f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD79F 17860 bytes
SHA-256: 1e903f7dd0142c7645ab3309aff7ec40b4a962f9331267303fbf76d2b7925543
font_01_sfnt_off000105c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105C7 11388 bytes
SHA-256: e952020abb133c8f12040c03cba92c74150ccb1e28e3e82ba8fbc5a382e1e782
font_02_sfnt_off00012087.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12087 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1