Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7ceb743dc58d615…

MALICIOUS

PDF

80.5 KB Created: 2021-09-14 03:14:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 98ef6eaafb3bae020455fdc9003a9398 SHA-1: 831ee87852fe77eaa5a28f7365003fb33742a434 SHA-256: a7ceb743dc58d6154ac8b0322cde577b262ba96f49d9e597bd7e7ddc282dfc48
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URIs and is identified as a link farm, suggesting it's designed to redirect users to potentially harmful websites. The PDF structure and embedded URLs point towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://oniceh.ru/uplcv?utm_term=gree+led+tv+price+in+pakistan PDF link annotation
    • https://arch.ua/ckfinder/userfiles/files/wunufozusufe.pdfIn PDF document text
    • http://sake2metustin.com/uploads/files/pabotatedalawopekafegup.pdfIn PDF document text
    • http://chemonova.com/FCKeditor/file/36053388794.pdfIn PDF document text
    • http://efsanepin.com/calisma2/files/uploads/47685344619.pdfIn PDF document text
    • http://harposwebdesign.nl/app/webroot/files/userfiles/files/jixasa.pdfIn PDF document text
    • https://ms1oke.com/contents/files/rijufewogezosefu.pdfIn PDF document text
    • http://newbusan.net/FileData/ckfinder/files/20210907_A2CC9F4738FF6BFB.pdfIn PDF document text
    • https://omegaplus.bg/uploads/pages/files/wuvuvoromolovirax.pdfIn PDF document text
    • https://gemwares.com/userfiles/file/foduselegadobabivu.pdfIn PDF document text
    • https://zoldlaptop.hu/ckfinder/userfiles/files/rozidu.pdfIn PDF document text
    • https://almondzwealth.com/administrator/imagetemp/file/75233753059.pdfIn PDF document text
    • http://millecolori.it/images/file/25010645981.pdfIn PDF document text
    • http://sieuthibongda.net/ckfinder/userfiles/files/muzusiz.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/16131f8fb2d23d---getan.pdfIn PDF document text
    • https://www.marjojaspers.nl/ckfinder/userfiles/files/gafifudizozukalinaxajome.pdfIn PDF document text
    • http://xn--k1akb4c.xn--p1ai/userfiles/file/wowurilewu.pdfIn PDF document text
    • https://dolphinsolutions.net/ckfinder/userfiles/files/nesumizulelewiro.pdfIn PDF document text
    • http://fecoil.com/userfiles/file/87065822334.pdfIn PDF document text
    • http://www.radio-kum.si/data/files/7248067980.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/57929111349.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_off0000d610.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD610 17920 bytes
SHA-256: 49aa3d62ac005276e25216cfd121e92450c762b5c3f630f73e9761dbfcc5bc2a
font_01_sfnt_off000104c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104C1 10584 bytes
SHA-256: 8f02480916d399e546f2e1c8c4178eb30bf80ccc02c7dc23c20c1f337aee8584
font_02_sfnt_off00011d0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D0C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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