Malicious PDF — malware analysis report

Static analysis result for SHA-256 7baff7841095fe49…

MALICIOUS

PDF

88.0 KB Created: 2021-09-17 20:07:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 7838c8c390b874f8998b9914bf682077 SHA-1: 2401abf35a3bf1770da2f7f1b542fd714ced058f SHA-256: 7baff7841095fe49d76eb3b9e04bb3f68e35d6f7582851f02e0f11974a9a2386
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by multiple heuristics, including a high-confidence ML classifier and ClamAV, indicating malicious intent. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic specifically points to the document acting as a link farm, directing users to numerous distinct hosts. This suggests the primary purpose is to redirect users to potentially malicious websites for further exploitation or phishing.

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 http://123podkrovie.sk/editor_uploads/files/jefesumamuxovizibesupo.pdf In PDF document text
    • http://arsvet.ru/img/upload/66973953496.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614034947fd40---97898684235.pdfIn PDF document text
    • http://zjhywt.com/images/upload/File/konexojuwanawafujopoz.pdfIn PDF document text
    • https://licorne-hotel-restaurant.com/userfiles/file/wenexogusomix.pdfIn PDF document text
    • http://stroyvodservice.ru/upload/File/48373168655.pdfIn PDF document text
    • https://dacola.com/upload/files/99640903246.pdfIn PDF document text
    • http://cuboni.com/uploadfile/hong202109161232587560.pdfIn PDF document text
    • https://glearningsolutions.com/userfiles/files/69970769536.pdfIn PDF document text
    • http://www.primariasantana.ro/uploads/file/faxeja.pdfIn PDF document text
    • https://flexi-cms.com/uploads/file/watujizosifasebasovam.pdfIn PDF document text
    • http://xahuaheng.cn/userfiles/file/siguzulebe.pdfIn PDF document text
    • https://www.truckersplantparts.co.uk/ckfinder/userfiles/files/donutipob.pdfIn PDF document text
    • http://sin-hua.org/userfiles/natola.pdfIn PDF document text
    • https://travellifeafrica.com/ci/userfiles/files/76441412635.pdfIn PDF document text
    • http://jinruily.com/UploadFile/file/20210901140620130.pdfIn PDF document text
    • https://himalmanpower.com/ckfinder/userfiles/files/44861094853.pdfIn PDF document text
    • http://immobilieninvestors.net/userfiles/file/96878643571.pdfIn PDF document text
    • https://viadagio.be/userfiles/file/safepetoxatelisebekon.pdfIn PDF document text
    • http://veterinariomauracotti.it/userfiles/files/50205381136.pdfIn PDF document text
    • http://vrajacreation.com/uploaded_files/userfiles/files/bozarolirizuw.pdfIn PDF document text
    • http://exosportsante.fr/ckfinder/userfiles/files/nizavepifofedefo.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/53093280819.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=csr+2+apk+modPDF 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_off0000f3b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3B7 18664 bytes
SHA-256: 258cc752d2a052cb01e3e7a410cc2f0bd87bd0801b602b291df9b858e9a54ba9
font_01_sfnt_off000123b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123B3 10324 bytes
SHA-256: a17b8dc5601c2d88e04d1833b053d486027c4cab6cc6e1ff4ce4ae075d90d552
font_02_sfnt_off00013b0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B0F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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