Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8a2b7613e34b32f…

MALICIOUS

PDF

75.5 KB Created: 2021-09-12 08:49:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 45a149ee4d355013d22896cda977b9ef SHA-1: c136bbf74ac759ad60b49be8a926d6da8d86cd54 SHA-256: e8a2b7613e34b32f8304db12474d80e8c2bf1bf2864fc2ebf0028cb7e37ad186
166 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a large number of embedded URLs, many pointing to potentially malicious domains, and is flagged as a link farm. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_URI heuristics strongly suggests an attempt to redirect users to external, potentially harmful content. While no scripts were explicitly extracted, the nature of the PDF and its embedded links points towards a malicious intent to lead users to compromised or malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://www.tlo.ntou.edu.tw/ckfinder/userfiles/files/sevun.pdf In PDF document text
    • https://cli-kh.com/uploads/files/202109120619139709.pdfIn PDF document text
    • https://nocenzura.space/web/img/podborky/files/5805307497.pdfIn PDF document text
    • http://hotelrealerimini.it/userfiles/files/sisuvoriwukafasejefi.pdfIn PDF document text
    • http://hostingureitings.lv/uploads/userfiles/files/52133172418.pdfIn PDF document text
    • http://phuketdriveschool.com/userfiles/file/23847677332.pdfIn PDF document text
    • http://www.addvanceo.info/userfiles/files/wawepege.pdfIn PDF document text
    • http://liga-stf.ru/i/upload/files/duxawibutolomef.pdfIn PDF document text
    • http://madinagirls.com/easydo%20v2.00/files/uploads/50812005216.pdfIn PDF document text
    • https://www.willmarshelter.com/ckfinder/userfiles/files/32872951491.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613219903b9e9---kojoxazezaripuzufodo.pdfIn PDF document text
    • http://tutek.eu/userfiles/file/94024230573.pdfIn PDF document text
    • http://dienvietbac.com/uploads/files/ruligekujawitefumiwovuse.pdfIn PDF document text
    • https://creativenursery.net/home/creative/public_html/ckfinder/userfiles/files/15000978416.pdfIn PDF document text
    • http://szm.hu/userfiles/file/gezodejuwupejikarujebez.pdfIn PDF document text
    • http://ginzaramen.us/uploads/files/lobaxazojeviwujerotokuziv.pdfIn PDF document text
    • https://ka-base.no/images_students/files/luwebulajekuveketomepok.pdfIn PDF document text
    • http://angelojrobles.com/admin_initial_test/userfiles/file/raxaxukibufesikita.pdfIn PDF document text
    • https://cambodiaangkorhomestay.com/userfiles/file/92280394977.pdfIn PDF document text
    • http://scro.ru/pic/file/nazodam.pdfIn PDF document text
    • http://vswet.ru/f/susojaxuv.pdfIn PDF document text
    • http://4bx.pl/public/file/wupunakinukozileg.pdfIn PDF document text
    • https://ispartaorganizasyon.com/ckfinder/upload/files/kobapadapaba.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1613694f36f279---farepufegoj.pdfIn PDF document text
    • https://cardion.dk/gfx/fckimages/file/liwufavosixaxaf.pdfIn PDF document text
    • http://hoteldanang.com/uploads/images/files/111862089.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=gomo+ph+apnPDF 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_off0000c619.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC619 17292 bytes
SHA-256: 5ab7a96345b1ce94521f48075ef2644355c632e3bfe5ae3f7671be311a3062ca
font_01_sfnt_off0000f2a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2A0 9920 bytes
SHA-256: 381febf7e4c6b4e34c283e540f1ede7527833976f207678fe35108457a56a95a
font_02_sfnt_off0001084b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1084B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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