Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4665ad9b5f36e9e…

MALICIOUS

PDF

70.9 KB Created: 2021-09-30 23:29:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: e929d3bebe30ca535890ef3da8f42a11 SHA-1: 312f9be785ada56e70faa0949a93a645f6d85e0e SHA-256: c4665ad9b5f36e9ed996fc60d6d48207ec759662c5b307f5d8492568f93c94d3
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 http://www.dreamstoreonline.es/ckfinder/userfiles/files/nedaxosazuwozofobimobaru.pdf In PDF document text
    • https://ecoledesgourmets.com/userfiles/file/wejudebabejemofumamowaki.pdfIn PDF document text
    • http://kleinschadenexperte.com/userfiles/file/5029554738.pdfIn PDF document text
    • https://nakatarikaszel.pl/app/webroot/userfiles/file/duzapuvumosiponineremajam.pdfIn PDF document text
    • http://www.psyforyou.nl/upload/fckeditor/file/54892968389.pdfIn PDF document text
    • https://fullprotec.com/ckfinder/userfiles/files/kevimazatoditaxofebiwima.pdfIn PDF document text
    • https://porfic.com/fotos/file/gadibikuvunodema.pdfIn PDF document text
    • https://postelezmasivu-zlin.cz/ckfinder/userfiles/files/guwebetafo.pdfIn PDF document text
    • http://bayernglobal.de/userVZ/file/9725707422.pdfIn PDF document text
    • https://alice-immo.com/userfiles/file/97347565506.pdfIn PDF document text
    • http://zaiger.ru/img/file/38709650508.pdfIn PDF document text
    • http://riviera.az/userfiles/file/nexuzod.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/16137014758e54---18857979602.pdfIn PDF document text
    • http://architettoannalisatinelli.it/userfiles/files/xodiwegojo.pdfIn PDF document text
    • https://bacsionline.net/userfiles/file/89975658340.pdfIn PDF document text
    • https://bbox.ru/images/shared/file/9918336993.pdfIn PDF document text
    • http://archiwum.wyryki.eu/admin/ckfinder/userfiles/files/kowajatuje.pdfIn PDF document text
    • http://losmarinoslanzarote.com/marinarubicon/admin/file/perideli.pdfIn PDF document text
    • http://www.mamafoundation.cz/ckfinder/userfiles/files/zixejimetapujolaxejox.pdfIn PDF document text
    • http://wgadget.com/file_media/file_image/file/tunupeferu.pdfIn PDF document text
    • https://kopari.hu/files/file/tevoxepaxebalufimivebimi.pdfIn PDF document text
    • http://gs-metals.com/filespath/files/20210920233722.pdfIn PDF document text
    • http://loveperfectionschool.com/upload/file/gizinepebatesesuguduros.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=how+to+automatically+save+apps+to+sd+cardPDF 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_off0000b119.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB119 17280 bytes
SHA-256: 57477f75ff14fb7bb386d45bf5c0ee91d923a83c665df15c75e170ae29aa847f
font_01_sfnt_off0000dca0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCA0 10928 bytes
SHA-256: 5243a6ca269cf9950c3dab3f16d9e8b18b4f1d588c2752581a3cbdbf8b53c85c
font_02_sfnt_off0000f60a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF60A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1