Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a789f766a5c0b89…

MALICIOUS

PDF

71.5 KB Created: 2021-09-19 04:49:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 3aa235559a3ff94b0a47516feb7d6a86 SHA-1: 8db36a0013ff98862687c3d31dd33b6fb14baba1 SHA-256: 2a789f766a5c0b8955fbbfa1638a66ab31eb8ea3d82046b92ba25087f9e2ab57
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs pointing to external sites, many of which are likely part of a link farm designed to redirect users. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, suggesting a phishing or malware distribution scheme. No scripts were extracted, but the overall structure points to a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://photojet.bg/userfiles/file/niwovugod.pdf In PDF document text
    • http://abw10thstreetne.com/uploads/files/87214226052.pdfIn PDF document text
    • http://burbank.kopanramen.com/uploads/files/93810530473.pdfIn PDF document text
    • http://pincailight.com/zk/UploadFile/file/2021091404243773499.pdfIn PDF document text
    • https://ietc-oman.saktoon.com/userfiles/files/bizofoladegaxunibuz.pdfIn PDF document text
    • https://yesilkoyluleriz.biz/resimler/files/naxopitotijipuwepewibali.pdfIn PDF document text
    • http://www.dawnrotaryclub.tw/UserFiles/files/51567415184.pdfIn PDF document text
    • http://dinhvi5s.com/images/newtech/files/16107588868.pdfIn PDF document text
    • https://web-sila.ru/wp-content/plugins/super-forms/uploads/php/files/cb86d2fd1755a18c30620549af73409b/moporadorikakaka.pdfIn PDF document text
    • http://huemin.com/fckeditor/userfiles/file/74751374468.pdfIn PDF document text
    • https://silverbirdmarketing.com/pages/images/file/purufade.pdfIn PDF document text
    • http://emeat.ru/var/files/lezirilivadeviwowi.pdfIn PDF document text
    • http://imobilestore.de/userfiles/file/xaloset.pdfIn PDF document text
    • https://granitabrasive.com/editor_up/99835515424.pdfIn PDF document text
    • http://bibliotekaszamocin.pl/img/upload/files/47572754424.pdfIn PDF document text
    • http://incomsistema.ru/ckfinder/userfiles/files/79602402116.pdfIn PDF document text
    • http://sanitaerprofi.ch/fckeditor/editor/images/file/61226499969.pdfIn PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/161383d233ff6f---gekimipu.pdfIn PDF document text
    • http://mariautonoleggiomarsala.it/userfiles/files/83815050970.pdfIn PDF document text
    • https://www.prshots.com/ckfinder/userfiles/files/sirupaj.pdfIn PDF document text
    • http://emeat.ru/var/files/wozok.pdfIn PDF document text
    • http://bitree.net/ckfinder/userfiles/files/3741063373.pdfIn PDF document text
    • https://studybrilliant.online/app/webroot/img/userfiles/file/91312512235.pdfIn PDF document text
    • http://wksystems.net/HotelEstimator/userfiles/file/mepasadixidarado.pdfIn PDF document text
    • http://asea-admin.com/_userfiles/file/20210908181354.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=id+for+alice+pack+in+unturnedPDF 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_off0000b7d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB7D6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cfed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFED 10588 bytes
SHA-256: 1366af9cb517060fe09bb1065c07a82bfc46f644f8fe1b7ad095cb688f6e9fb8
font_02_sfnt_off0000e827.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE827 15848 bytes
SHA-256: 9c6a5f0bbfee34241b7fc2ac6d447183ab9b45f9767d9cf680fbfb422b85d6ed