Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d9f8e6e29667dec…

MALICIOUS

PDF

82.0 KB Created: 2021-09-15 14:49:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: e9c2d05264a1f1475c13ef19eec56d59 SHA-1: 00d1e9836d56786e86233c2a4de5c2a53b4bfc27 SHA-256: 2d9f8e6e29667dec61dfe5285bc42215d35c8003ba56b9f090ba3833f589fa60
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many pointing to potentially disposable domains, suggesting a link farm or phishing lure. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM specifically flags this behavior. While no scripts were explicitly extracted, the nature of the embedded URLs and the overall detection suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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 http://mazurubezpieczenia.pl/zdjecia/fck/file/zowufamoraw.pdf In PDF document text
    • https://berbagiangka.com/contents/files/92328136987.pdfIn PDF document text
    • https://fotobolfestmeny.hu/mvc/userfiles/file/xomozupozox.pdfIn PDF document text
    • http://pyhunlian.com/uploadfile/file/dopubojatota.pdfIn PDF document text
    • http://ghibms.com/userfiles/files/kawodi.pdfIn PDF document text
    • http://zhizhencn.com/filespath/files/20210912210353.pdfIn PDF document text
    • http://zbigniewrodak.pl/galeria/file/jelaxorunezumi.pdfIn PDF document text
    • http://zeguvietnam.com/uploads/ckfinder/files/likakogemodi.pdfIn PDF document text
    • https://wisestudentz.com/userfiles/file/46619194248.pdfIn PDF document text
    • http://phongkhamthienhoa.vn/images/files/41563881790.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/15568279865.pdfIn PDF document text
    • http://el-system.jp/uploads/2012/files/fipibomijabifuxabesa.pdfIn PDF document text
    • https://defi128.phpascal.com/userfiles/files/tudutibe.pdfIn PDF document text
    • http://kpghomerepairs.com/uploads/image/files/zurosesuzitepumijemidimup.pdfIn PDF document text
    • http://scamps.biz/userfiles/file/72465363828.pdfIn PDF document text
    • http://ergo-logo-bamberg.de/userfiles/file/55221230907.pdfIn PDF document text
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613737aa5250d---71987992807.pdfIn PDF document text
    • http://golfproradost.cz/webpagebuilder/ckfinder/userfiles/files/marubarotodizugoriv.pdfIn PDF document text
    • http://kanchanaspa.com/ckfinder/userfiles/files/vutotasasilukeluk.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140c700c1392---xelibofajugeliwoxukam.pdfIn PDF document text
    • http://myshiou.com/uploads/files/202109071234417615.pdfIn PDF document text
    • http://wmc21.com/ckupload/files/viwosodekemexitisib.pdfIn PDF document text
    • https://zifu-tech.com/app/webroot/userfiles/files/zujuruvizawuvoxanakiwok.pdfIn PDF document text
    • http://systemsbiology.at/uploads/assets/file/36307774034.pdfIn PDF document text
    • https://quanghuydulich.vn/img_duhoc/files/56070148767.pdfIn PDF document text
    • http://99hospitalitygroup.com/ckfinder/userfiles/files/67969796585.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=what+are+the+thumbnails+in+androidPDF 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_off0000d000.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD000 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e817.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE817 10744 bytes
SHA-256: 0650696006d2c670b7b9766e243ef9bbab242dc077889772fc1a2b5bf13e003a
font_02_sfnt_off00010093.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10093 21836 bytes
SHA-256: 7ecd9f45654459e3831f48cea0f99d6b9fc140dfcc81aeb1e4c918bdf712c52b