Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7ad278e10bf26e8…

MALICIOUS

PDF

78.9 KB Created: 2021-09-18 11:08:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 5a863e979b00ae6a7e4e07192902425e SHA-1: 85ba15108feabb3b9e1b11ba6a9a17b88479bf05 SHA-256: b7ad278e10bf26e884176c22a602a7038cf7fda9726099ff03d8fe0b340c362e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, containing numerous external URIs pointing to various domains, many of which are likely disposable hosting. The presence of embedded URLs and the nature of the link farm suggest an intent to redirect users to malicious sites for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://archism.ru/uplcv?utm_term=channel+18+plus+tv+apk PDF link annotation
    • http://pietrek.com/MARCUS/files/file/61450777404.pdfIn PDF document text
    • https://perfecthospital.org/ckfinder/userfiles/files/domopikib.pdfIn PDF document text
    • http://navrattan.co/userfiles/file/85980455709.pdfIn PDF document text
    • http://doorsatyrau.com/ckfinder/userfiles/files/66155051382.pdfIn PDF document text
    • https://semsaesp.com/ckfinder/userfiles/files/58458132370.pdfIn PDF document text
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1613a2e78c8df5---kipuk.pdfIn PDF document text
    • http://joeun-it.com/userData/board/file/gebefa.pdfIn PDF document text
    • http://twtqedu.com/userData/ebizro_board/file/venogutodu.pdfIn PDF document text
    • https://jlgardner.org/home/jlg/public_html/ckfinder/userfiles/files/puzenizazunodelomev.pdfIn PDF document text
    • https://akemi.ro/hirek/file/82487692339.pdfIn PDF document text
    • http://antonio-pelella.eu/userfiles/files/96300179106.pdfIn PDF document text
    • http://bright-mineral.com/uploadfile/file/2021090606103297.pdfIn PDF document text
    • http://autowassenindex.nl/images/uploads/gunisematezap.pdfIn PDF document text
    • http://mayjack.com/upload/files/xezurumiluvi.pdfIn PDF document text
    • http://lamorenj.com/userfiles/files/28914718929.pdfIn PDF document text
    • http://bedrucken24.de/userfiles/file/rurux.pdfIn PDF document text
    • https://franchise-vietnam.com/app/webroot/img/files/gozotofodexe.pdfIn PDF document text
    • https://dongphuchuytai.com/upload/files/nagitomuxujokarawapa.pdfIn PDF document text
    • http://www.tiande-global.com/ckfinder/userfiles/files/tizifulolekubatisofuk.pdfIn PDF document text
    • http://velocimapper.com/webfiles/file/78510266841.pdfIn PDF document text
    • http://chemonova.com/FCKeditor/file/54903342159.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139ec31ca501---dudijogotoruwixusa.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bb3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB3E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d350.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD350 16360 bytes
SHA-256: 31a633ab6e6f82b659cda5a4113320013ca56cb0ef1a25fd6e5b1d7fff95bf95
font_02_sfnt_off0000fd44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD44 10588 bytes
SHA-256: cee84ce37567294319a4661e5400cb77a8c92b309a98d7b87999ed11b3552b5b
font_03_sfnt_off0001157f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1157F 17100 bytes
SHA-256: f0bc92d33481478c164c5309fdbe4ddf30fd50f3b3797bb7425ef43c6c060f33

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