Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c52f405bbe81607…

MALICIOUS

PDF

84.6 KB Created: 2021-09-14 06:27:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 9bba484c57bd3fcf790159ba36be7081 SHA-1: c905950e4c7c6d9fc6b8e28b9ceeabcc76ff4416 SHA-256: 9c52f405bbe81607eec81b4238c65fb21890d94deb908e4dc98f732ee00b62cd
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The presence of numerous embedded URLs, many pointing to disposable domains and structured as a link farm, suggests a phishing or malware distribution scheme. The wkhtmltopdf authoring application and the nature of the embedded URLs point towards a potential attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://rbtyutj01.com/userfiles/files/modinaluwakujofuk.pdf In PDF document text
    • http://unternehmensberatung-hegenbarth.de/userfiles/file/3767295988.pdfIn PDF document text
    • http://ebus.cn/up_file/file/98916834953.pdfIn PDF document text
    • https://cmflower-kkc.com/ckfinder/userfiles/files/15682894348.pdfIn PDF document text
    • http://budaikepkeret.hu/uploads/file/25203104363.pdfIn PDF document text
    • http://yibetter.com/data/files/7985486257.pdfIn PDF document text
    • http://csim.jp/ckeditor/uploads/files/kafosedikikesatafifexaj.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613efa2ac1177---dufaxojukivubigevoga.pdfIn PDF document text
    • https://brakos.it/file/jigebalezaguvetewamivi.pdfIn PDF document text
    • http://xn--b1akwe.xn--p1ai/userfiles/file/xaxadigitalufobabo.pdfIn PDF document text
    • http://jcon-aps.dk/userfiles/file/57016536801.pdfIn PDF document text
    • https://gianlucabruno.it/dati/upload/file/torofesujuwevu.pdfIn PDF document text
    • https://dijitalsanat.link/upload/files/zosuwifujorilox.pdfIn PDF document text
    • https://netron.pt/app/webroot/media/files/71376304889.pdfIn PDF document text
    • http://pentas.eu/userfiles/file/fufizoliwabitivosewovir.pdfIn PDF document text
    • http://smenergy.kr/uploaded/file/9741856826136bca100f95.pdfIn PDF document text
    • https://novsport.com/content/File/59041110136.pdfIn PDF document text
    • http://faradtvandor.hu/picture/userfiles/file/wogezotepujokoxomotap.pdfIn PDF document text
    • http://drprdesaihospital.com/uploads/tegixopabiwuvupakove.pdfIn PDF document text
    • https://rais.bg/uploads/file/89219042031.pdfIn PDF document text
    • https://phnews.ro/files/file/55405513255.pdfIn PDF document text
    • https://somogyplusz.hu/files/53693782322.pdfIn PDF document text
    • http://restaurant-lyons.fr/userfiles/file/vodixuxe.pdfIn PDF document text
    • http://www.sm.ac.th/ckfinder/userfiles/files/47941107048.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=alight+motion+mod+apk+for+pcPDF 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_off0000e499.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE499 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fcb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCB0 10840 bytes
SHA-256: d0ec56ee66a92797582aaafb45f919491841d268d62e64437608c20d10e16a9b
font_02_sfnt_off00011547.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11547 18256 bytes
SHA-256: 320e8406fc62ffa37f12bd92a7d39f893eea177d1b696e847fb05d9759ff44ba