Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf85a5682c9ed528…

MALICIOUS

PDF

79.5 KB Created: 2021-06-02 18:47:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: efe3e33669f8760adba8733d67fe1ee4 SHA-1: 058b9629c7bc32af29c20a170f9b663f2ccff486 SHA-256: cf85a5682c9ed5280c2255dd9aaa1710c8aa9aad98697d8c99eccb19f38a674d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many hosted on disposable domains or link farms, suggesting a phishing or malware distribution campaign. The document body, though heavily obfuscated, contains references to 'wkhtmltopdf' and 'coloring sheets', which is likely a lure to disguise the malicious nature of the links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://maypoin.ru/123?utm_term=frosty+the+snowman+free+coloring+sheets PDF link annotation
    • https://rezomiwutamanap.weebly.com/uploads/1/3/4/3/134362688/3417080.pdfIn PDF document text
    • https://kimiragijasem.weebly.com/uploads/1/3/4/0/134096233/taguvup-vogerexo-nekopanosesejo.pdfIn PDF document text
    • https://lonewarole.weebly.com/uploads/1/3/4/5/134593790/3133531.pdfIn PDF document text
    • https://vogowabiruzo.weebly.com/uploads/1/3/2/6/132681596/b1d08c92058c3c3.pdfIn PDF document text
    • https://pelifofenap.weebly.com/uploads/1/3/3/9/133997555/zagufaloz-nokuxawabufuk.pdfIn PDF document text
    • https://luwimaxilonava.weebly.com/uploads/1/3/4/7/134772317/6384951.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://mapijakemifo.pbworks.com/f/22850434929.pdfIn PDF document text
    • http://gijorugisaw.pbworks.com/w/file/fetch/144504267/buxitexomefo.pdfIn PDF document text
    • http://wuvebag.pbworks.com/f/55347915099.pdfIn PDF document text
    • http://godekazonigi.pbworks.com/w/file/fetch/144443850/physique_chimie_seconde_hachette_2014_corrig.pdfIn PDF document text
    • http://zufogopojut.pbworks.com/w/file/fetch/144488445/hubsan_h501a_x4_air_pro_app.pdfIn PDF document text
    • http://fixiguru.pbworks.com/w/file/fetch/144457083/44195061766.pdfIn PDF document text
    • http://nukuxim.pbworks.com/w/file/fetch/144485271/96636614823.pdfIn PDF document text
    • http://pamotekegopa.pbworks.com/w/file/fetch/144464556/modelo_de_carta_para_finalizar_contrato_de_arrendamiento.pdfIn PDF document text
    • http://supatibu.pbworks.com/w/file/fetch/144418026/repabavigikubilesi.pdfIn PDF document text
    • http://marutipug.pbworks.com/f/hulu_free_trial_hbo_max.pdfIn PDF document text
    • http://funinupun.pbworks.com/f/mavufemomupuron.pdfIn PDF document text
    • http://zemenifinabe.pbworks.com/f/pisubu.pdfIn PDF document text
    • http://jizakatum.pbworks.com/f/tugufap.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://scripts.sil.org/OFLIn 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_off0000e4ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4EF 5444 bytes
SHA-256: e9a6eebd7b275f5624fd9f35138a659994e608204efed6e6324abe6e7416da17
font_01_sfnt_off0000f763.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF763 10672 bytes
SHA-256: 9a877e6fb45f30a16237e5f6f349ccb663ebe22d04f9886b9d7d4b503bbe69a3
font_02_sfnt_off00011b86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B86 16060 bytes
SHA-256: 5b0d2701ab39d2f69c66d7d16c60d8db0b323aa0832947137e757b5401d27330

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