Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d915ade0ab67419…

MALICIOUS

PDF

81.2 KB Created: 2021-09-17 12:48:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: aa42819bcc06c49c5f40ce72876ee506 SHA-1: 745c6f43fa37ba03be2c8a416402ceb653e3330b SHA-256: 1d915ade0ab674197c70ade51705fbc68e1b8b1d5c2b32dbd14e68f891e124b8
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which point to disposable hosting and are structured as a link farm, a common tactic for phishing or distributing further malware. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically highlights this behavior, suggesting the PDF's primary purpose is to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://philabc.ru/uplcv?utm_term=gray+hat+c%23 PDF link annotation
    • https://anpheatingandac.com/nbloom/fckuploads/file/41093196067.pdfIn PDF document text
    • https://khogiaydantuonghanquoc.com/images/news/file/xopubasazogemibifaxoj.pdfIn PDF document text
    • http://sinosteelcode.com/filespath/files/20210910092312.pdfIn PDF document text
    • https://demetraproject.eu/ckfinder/userfiles/files/85173421815.pdfIn PDF document text
    • http://galaxyjewel.cn/uploadfile/files/46869663607.pdfIn PDF document text
    • https://tselectromechanical.com/uploads/CKfiles/files/49574692033.pdfIn PDF document text
    • http://vaonhaphatphap.com/images/uploads/files/31028881987.pdfIn PDF document text
    • http://ros-audit.com/i/up/file/70823978515.pdfIn PDF document text
    • http://www.sloepverhuur-debiesbosch.nl/upload/files/mazekawuzeroze.pdfIn PDF document text
    • http://businessplan-capalpha.eu/mbp/upload/images/images/upload/ckfinder/18108320075.pdfIn PDF document text
    • http://vuason.vn/upload/files/dibezajogubewavosagadidub.pdfIn PDF document text
    • https://jordan.si/dokumenti/file/jezukif.pdfIn PDF document text
    • http://lnyuanzong.com/uploads/files/20210917095635.pdfIn PDF document text
    • http://appextskihjthj.handysociality.com/upload/files/sapirogipip.pdfIn PDF document text
    • http://ventexevent.se/uploads/file/84106033272.pdfIn PDF document text
    • http://soosanfix.com/upload/fckeditor/file/febunugilev.pdfIn PDF document text
    • http://rayocazar.com/images/elfinder-1.1/files/file/zubekijikovixofire.pdfIn PDF document text
    • http://ms-krmelin.cz/app/webroot/files/files/kalagejunasaragapu.pdfIn PDF document text
    • http://metalzilembo.it/userfiles/files/wevalakofejetomezamutuno.pdfIn PDF document text
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/8b4e6ea5a61148c5b06141e292e1abd9/1731226486.pdfIn PDF document text
    • https://escolaalfa.com/userfiles/file/32133860094.pdfIn PDF document text
    • http://tinhdaurosa.com/Images_upload/files/69825343669.pdfIn PDF document text
    • http://criollo-cocoa.com/userfiles/file/66185217354.pdfIn PDF document text
    • 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_off0000d942.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD942 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f154.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF154 18788 bytes
SHA-256: 1f34f7667426835605eaecb4681335273bb241b9d49f71f44f9ac84b50d24587
font_02_sfnt_off00012204.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12204 9816 bytes
SHA-256: 3cc6ffd6986395b16a9567ba165e64bdb806cf9629e412a600bfd5a6285db4a6

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