Malicious PDF — malware analysis report

Static analysis result for SHA-256 427dea976ad1c037…

MALICIOUS

PDF

73.0 KB Created: 2021-09-16 10:52:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: c309414dd3989306ff9fc00c5f6dbe46 SHA-1: cf305309a10bf0d0400939a0efc6a44588caf9af SHA-256: 427dea976ad1c037349d3f8e462e56fe5458cf01f2833a6ac1406ea204efb294
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code within documents. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the numerous extracted URLs indicate that this PDF is part of a link farm designed to redirect users to potentially malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://smidgel.ru/uplcv?utm_term=how+to+organize+music+files+on+android PDF link annotation
    • https://betenagro.com/sites/default/files/file/betilateziduvanudifasuw.pdfIn PDF document text
    • http://hanauhrova.cz/files/80720573072.pdfIn PDF document text
    • http://koppeika.ru/userfiles/file/13232686059.pdfIn PDF document text
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c7dd5e4bed---wogevevuruxu.pdfIn PDF document text
    • http://dragonera.cn/admin/userfiles/file/xudedaz.pdfIn PDF document text
    • http://aias.pnu.ac.th/ckfinder/userfiles/files/4401674189.pdfIn PDF document text
    • https://venusnvs.com/userfiles/file/bovezewogopumo.pdfIn PDF document text
    • https://bravo-hk.com/userfiles/file/75295361024.pdfIn PDF document text
    • http://jingyilin.org/uploads/file/zabufosolukijidil.pdfIn PDF document text
    • http://metabolizmusonline.hu/images/upload/file/wijolosopab.pdfIn PDF document text
    • https://dpt-mh.com/uploads/news/files/mutinenadili.pdfIn PDF document text
    • https://keiba-like.biz/js/ckfinder/userfiles/files/64007444872.pdfIn PDF document text
    • http://blccy.com/userfiles/files/54579669582.pdfIn PDF document text
    • http://drkoopman.nl/cmsimages/file/52700714229.pdfIn PDF document text
    • http://currycornersugarland.com/admin/images/file/mowozavoj.pdfIn PDF document text
    • https://sikdercollegeofpharmacy.com/scp/ckfinder/uploads/userfiles/files/99415908313.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613507f75b511---82510619673.pdfIn PDF document text
    • http://personal.sut.ac.th/chantira/port/ckfinder/userfiles/files/komaxefawamelivupu.pdfIn PDF document text
    • http://website-design-company.in/dev3/damodar/ckfinder/core/connector/php/userfiles/files/nabusunajotoxotese.pdfIn PDF document text
    • http://sapthagireesyathra.com/userfiles/file/61770239468.pdfIn PDF document text
    • http://rafaelokazakov.com/file/bilomapulojujufupo.pdfIn PDF document text
    • http://tractortools.cz/ckfinder/userfiles/files/sujejip.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_off0000b9bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB9BF 16548 bytes
SHA-256: 890710e2784be6bf5799d1824a0118dd83df76645f756c0723d6165a8e702ca9
font_01_sfnt_off0000e49f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE49F 11056 bytes
SHA-256: d8f4ec48b071930e789710acd1973d7662ed7cfffe345726104fe014e62973e7
font_02_sfnt_off0000fe3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE3C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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