Malicious PDF — malware analysis report

Static analysis result for SHA-256 45577a2efd21e0e0…

MALICIOUS

PDF

87.4 KB Created: 2021-09-11 23:57:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-27
MD5: 64f0387de59bcd8a498fe7f902a09d5c SHA-1: c47a8deac61d85edfdc6eaf4f10c23bc5c011e12 SHA-256: 45577a2efd21e0e0aa194374b4b7627422ad199087392ec1d4d8def1072a26c4
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, exhibiting characteristics of a phishing or trojan distribution. It contains a large number of embedded URLs, many pointing to potentially disposable domains, suggesting a link farm or redirection scheme to host malicious content. While no scripts were explicitly extracted, the PDF structure and embedded URI heuristics indicate an attempt to redirect users to external, untrusted resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 5

  • 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.
  • 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://ist-lb1.istanajp.com/contents/files/ferozevatuxogajulikigoz.pdf In PDF document text
    • https://weishinclinic.com/uploads/files/202109032219038212.pdfIn PDF document text
    • http://taeguektour.com/FileData/ckfinder/files/20210911_B89804BC39DA495E.pdfIn PDF document text
    • http://dentherapia.hu/files/file/wuxezadujuvek.pdfIn PDF document text
    • https://natanashoes.com/kingkong/userfiles/files/wafopoxonogojefujebugebup.pdfIn PDF document text
    • https://delcinfo.ru/img/files/files/memefek.pdfIn PDF document text
    • http://home-plast.ru/foto/files/dawejukuwenamopatelus.pdfIn PDF document text
    • http://songhandiban.com/uploadfile/file/2021090119575373499.pdfIn PDF document text
    • https://linker.tw/files/kogemetudajaviwusapupopob.pdfIn PDF document text
    • http://malopolskiszlakwinny.pl/upload/File/rijulu.pdfIn PDF document text
    • http://pedraferro.com/files/files/67239898450.pdfIn PDF document text
    • https://andymullinscommercial.com/home/andy/public_html/ckfinder/userfiles/files/gavamunatenowozaroto.pdfIn PDF document text
    • https://iwistw.com/upload/files/29808891612.pdfIn PDF document text
    • http://fornacedelia.it/userfiles/files/wavomugajijezetino.pdfIn PDF document text
    • http://britishcytology.org.uk/ckfinder/userfiles/files/73105632566.pdfIn PDF document text
    • https://ssekolkata.com/ckfinder/userfiles/files/17352355459.pdfIn PDF document text
    • http://transcash.com/ci/userfiles/files/xiputejekiwumevit.pdfIn PDF document text
    • https://xinpayflow.com/ckfinder/userfiles/files/fujexowosarejanigufudep.pdfIn PDF document text
    • http://tokyoracing.hu/userfiles/file/kizinemejorole.pdfIn PDF document text
    • https://www.truck-transport.com/ckfinder/userfiles/files/kexanufobokabagotikagabak.pdfIn PDF document text
    • https://karlholmbygg.se/UserFiles/files/26387332146.pdfIn PDF document text
    • https://okazdedziecko.pl/_files/Media/file/49682876481.pdfIn PDF document text
    • http://thermcom.cz/userfiles/file/46480853735.pdfIn PDF document text
    • http://neurooperations.com/ckfinder/userfiles/files/67244064329.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=android+10+pubg+lite+hackPDF 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_off0000ee2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE2E 18728 bytes
SHA-256: 3d10f383ad567e01b2ffaefefefc8ab6adeec191102e23d4409366df6f9b7e2d
font_01_sfnt_off00011ee9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EE9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013700.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13700 11112 bytes
SHA-256: f516f6e589c6f7d11f46d41bbe1ba48405acf514414646857ac4e5fdbfa77735