Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3987628a248a4d1…

MALICIOUS

PDF

86.9 KB Created: 2021-09-21 01:10:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: fca6c87c57604a80778a7c45ed6488ce SHA-1: 0006ce5daa51db811051fc90b9011ba50b0cdde0 SHA-256: c3987628a248a4d1ba8f79e5cf82ec337f9dc8ffafe10794f3131d71efb977d9
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The heuristics indicate it functions as a link farm, with numerous embedded URLs pointing to potentially malicious domains. While no scripts were directly extracted, the nature of the link farm suggests an attempt to redirect users to a compromised site for further exploitation, likely involving phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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://pasationtravellers.com/root/FCKeditor/file/zunuduzatuzufesewokenan.pdf In PDF document text
    • https://pkbae.rs/files/notuladelepega.pdfIn PDF document text
    • https://yocarbroker.com/upload/ckfinder/files/kuzimebebemasejafipodenij.pdfIn PDF document text
    • http://kalmi.ru/upfiles/files/zafefik.pdfIn PDF document text
    • http://marta-galan.com/files/varios/file/nokigapopumimux.pdfIn PDF document text
    • http://fixmyhelicopter.com/project-new/christianbook/upload_images/file/danojekujananidile.pdfIn PDF document text
    • http://investgeorgia.ge/userfiles/file/sujuzibumit.pdfIn PDF document text
    • https://baongochoa.com/upload/file/palizabodu.pdfIn PDF document text
    • https://menu2uplus.com/images/file/45002109144.pdfIn PDF document text
    • http://asia-test.informacittadino.net/media/files/lumebarizatetopetenujimek.pdfIn PDF document text
    • https://10s317.com/uploads/files/202109062112035184.pdfIn PDF document text
    • http://pmrs.ps/userfiles/file/30292821126.pdfIn PDF document text
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/1je3afjrl30o5vnmq5u680g6u7/fuzonu.pdfIn PDF document text
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/946fb3fc5465bd0f08ea0cbd2b37e6c5/bagasaduzurejuvof.pdfIn PDF document text
    • https://hometutorsdelhi.com/userfiles/files/vetisebemaweg.pdfIn PDF document text
    • http://clair-environnement.eu/catalogue_dynamique/file/6726372143.pdfIn PDF document text
    • http://myblindz.com/fck_user_files/file/vutajabuzuxijojanutidu.pdfIn PDF document text
    • http://thegoshow.net/userfiles/file/18535672562.pdfIn PDF document text
    • http://vendsol.com/userfiles/file/xujuzaxanejogubemeni.pdfIn PDF document text
    • https://repairbase.net/FCKeditor/editor/filemanager/connectors/php/images/file/57801459876.pdfIn PDF document text
    • https://daotaolaixesontay.com/uploads/file/vidajodisamajafeje.pdfIn PDF document text
    • https://ddtoyz.com/ckfinder/userfiles/files/70201751699.pdfIn PDF document text
    • https://universal4shipping.net/userfiles/file/jexemibenegotudejoruw.pdfIn PDF document text
    • http://sino-web.net/filespath/files/20210902090514.pdfIn PDF document text
    • https://semsaesp.com/ckfinder/userfiles/files/42393899083.pdfIn PDF document text
    • http://poaglasses.com/uploads/files/202109101915479000.pdfIn PDF document text
    • http://pes.edu.mn/ckfinder/userfiles/files/bogukovosivururiwija.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=android+device+memoryPDF 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_off0000f086.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF086 17688 bytes
SHA-256: f0c4ebba80f883ddf311a25c2dd01e25168be4c63d0e4a71d0edda51788a0af4
font_01_sfnt_off00011e9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E9A 10216 bytes
SHA-256: c0d3ed69077ad5dd114731762f9c4daa35779e6c93f3a313cbd5fe6fd2ce8713
font_02_sfnt_off0001357b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1357B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1