Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7e526ee05891174…

MALICIOUS

PDF

83.6 KB Created: 2021-09-20 18:33:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 4d66e8d33d7930676bf086694b56df77 SHA-1: 9bb7f00cf694dc149f09f8e52b118e96cf4f5395 SHA-256: f7e526ee05891174789336acf37a907be2cdf45eac88bf1f9c66796bf7b0f826
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged as malicious by ML classifiers and ClamAV. It contains numerous embedded URLs, with one heuristic identifying it as a link farm on disposable hosting. The primary purpose appears to be directing users to a collection of other PDF files, likely for phishing or further malware distribution. No scripts were extracted, but the PDF structure itself facilitates the redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://un7un9b3rl1pa7-99.com/contents/files/wulepanapoz.pdf In PDF document text
    • http://intranet.uts.edu.co/portal/app/ckfinder/userfiles/files/notokabamokiw.pdfIn PDF document text
    • https://proxus.nl/file/56537914883.pdfIn PDF document text
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613c4db77a344---lewakupabuwulevukizovi.pdfIn PDF document text
    • https://spvi.cn/filespath/files/20210919122355.pdfIn PDF document text
    • http://katyababash.com/images/uploads/file/41434098780.pdfIn PDF document text
    • http://tscyw.net/userfiles/file/20210919040938_9pvfhz.pdfIn PDF document text
    • http://rm-centr.ru/uploads/file/48984275658.pdfIn PDF document text
    • http://jrecchina.com/ckeditor/ckfinder/userfiles/files/marimazimagapat.pdfIn PDF document text
    • https://vrindaindia.com/php/joseph/uploads/file/68823781271.pdfIn PDF document text
    • http://jianianhuayule.a9188.com/upload_files/art_files/files/20210911_150410.pdfIn PDF document text
    • https://tecnibat.net/uploads/archivos/15568642770.pdfIn PDF document text
    • http://massageindex.nl/images/uploads/vugukunuf.pdfIn PDF document text
    • http://kanalizace-ul.cz/userfiles/file/67274242091.pdfIn PDF document text
    • http://moiarchitekci.pl/pliki/file/92959958212.pdfIn PDF document text
    • http://robbes.nl/media/files/46207040556.pdfIn PDF document text
    • https://www.agencesramos.com/ckfinder/userfiles/files/49059855670.pdfIn PDF document text
    • http://abnigakgdsg.friendship-match.com/upload/files/75592721344.pdfIn PDF document text
    • https://www.jaegeraviation.com/ckfinder/userfiles/files/niluvejalefuduv.pdfIn PDF document text
    • https://mytalk7.com/_UploadFile/Images/file/mozugawujepoku.pdfIn PDF document text
    • http://domuran.pl/files/file/wokawiroxuxatedivaxi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=how+do+students+learn+best+in+the+classroomPDF 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_off0000e215.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE215 17652 bytes
SHA-256: c0717e35bb7239b38a924fe44c31ba2eac11052645acf63a61083627de07d6b4
font_01_sfnt_off00010fa5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FA5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000127bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127BC 10952 bytes
SHA-256: 3ef86fb5b0008e33fc049c79f4a5adc1c3eae88f35e08d467182bc0fbc48db59

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