Malicious PDF — malware analysis report

Static analysis result for SHA-256 b86038fd19ec8049…

MALICIOUS

PDF

89.0 KB Created: 2021-09-18 20:34:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: ec1a7ffa88e430032e2f663b016e0cc2 SHA-1: b56347cc77faaa998d1027104715e250f529d1a3 SHA-256: b86038fd19ec8049041ece21b25960de8aa943d82230943d286b59e495f0c880
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and is identified as a link farm by heuristics, indicating a malicious intent to redirect users. The ClamAV detection and ML classifier further support its malicious nature, likely serving as a lure to a phishing or malware distribution site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://atputasbazes.lv/images/userfiles/files/49628310793.pdf In PDF document text
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/4f605c399da1488e94da4823a84216f5/kikebanajujijidupawe.pdfIn PDF document text
    • http://marjoyunlar.com/calisma2/files/uploads/84102670891.pdfIn PDF document text
    • http://snabsz.ru/ckfinder/userfiles/files/19701055531.pdfIn PDF document text
    • http://whatcanidoforyou.eu/publish/file/6949634557.pdfIn PDF document text
    • https://tuinvandecruys.be/file/75868443974.pdfIn PDF document text
    • http://bc-arman.kz/ckfinder/userfiles/files/53910298479.pdfIn PDF document text
    • http://euromarkcreations.com/new/fck_img/file/dexej.pdfIn PDF document text
    • http://langmoon.jp/js/upload/files/runusowamevamapatam.pdfIn PDF document text
    • https://thibiditrading.com/public/userupload/files/tinirasebupi.pdfIn PDF document text
    • https://quizai.com/uploads/files/noxafudeleboduzubakuba.pdfIn PDF document text
    • http://energy-labels.nl/userfiles/file/suvonado.pdfIn PDF document text
    • http://drsuthichai.com/userfiles/files/wamonexuwojenigezujov.pdfIn PDF document text
    • http://galerie45.com/userfiles/file/rosilowumi.pdfIn PDF document text
    • https://xn--bankkrtya-41a.hu/js/ckfinder/userfiles/files/xeven.pdfIn PDF document text
    • http://global-leasing-management.com/uf/file/67618695490.pdfIn PDF document text
    • https://moiatakashta.com/userfiles/file/zevowojerigux.pdfIn PDF document text
    • http://mosjob.ru/images/file/20840443428.pdfIn PDF document text
    • http://obchodsezlatem.cz/upload/files/45162374086.pdfIn PDF document text
    • https://matfplayer.com/calisma2/files/uploads/nenexufat.pdfIn PDF document text
    • https://leifs-auto.dk/images/file/xumidusidunugapolufopodag.pdfIn PDF document text
    • https://megalightgroup.lv/uploads/files/rubadeperiran.pdfIn PDF document text
    • http://tetraeng.it/userfiles/files/74940850894.pdfIn PDF document text
    • http://studiomilano.eu/userfiles/files/rotanufixafelabu.pdfIn PDF document text
    • https://laptopserwis.com/app/webroot/media/files/mexulusiwolukijevi.pdfIn PDF document text
    • https://wonwon.taipei/photo/file/40906727623.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=best+free+android+survival+gamesPDF 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_off0000f8a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8A2 17220 bytes
SHA-256: 4c16b141463b041685ec18ecc88e23323785fd029c05df6a9618b9da87393846
font_01_sfnt_off000124ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124EF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013d06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D06 10916 bytes
SHA-256: 982e7897b5610c4d5a6f181c1ed9564427da4580b0f468a4c071b549709ae01f

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