Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ad4dea862c34941…

MALICIOUS

PDF

82.9 KB Created: 2021-09-13 19:36:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: a32cc9699616dd02319e427c291d3638 SHA-1: 1f6b7f4502d41e963093e41cdbb04a491a713027 SHA-256: 8ad4dea862c349419bf82fc5a7311779ee84b4242f52d138ef0e529b42433562
154 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection for Pdf.Phishing.Trojan and an ML classifier indicating maliciousness. The document body, though heavily obfuscated, combined with the PDF_SEO_DISPOSABLE_LINK_FARM heuristic and numerous unknown URLs, suggests a phishing or scam attempt. The presence of embedded JavaScript further supports the malicious intent, likely to facilitate the phishing or scam operation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

Heuristics 7

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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 http://idolyokocho.com/js/ckfinder/userfiles/files/20001590693.pdf In PDF document text
    • http://csc0512.com/userfiles/file/20210904152031_l3wrtr.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134265f5075f---68972440920.pdfIn PDF document text
    • https://mudrun.com/home/mud/public_html/ckfinder/userfiles/files/wefir.pdfIn PDF document text
    • https://xn----7sbeo1acdy3adh.xn--p1ai/userfiles/file/jigazuxiluvogomebiv.pdfIn PDF document text
    • http://pomodorolennep.de/gfx/userfiles/files/59602119923.pdfIn PDF document text
    • https://m-isc.com/userfiles/file/1797619503.pdfIn PDF document text
    • http://energosol.pl/images_cms/file/kinodavugalomuwufa.pdfIn PDF document text
    • http://an-professional.ru/img/files/file/52937891133.pdfIn PDF document text
    • https://ghnservizi.com/file/45867249374.pdfIn PDF document text
    • http://ya-ke.cn/admin/upload/laguwekagef.pdfIn PDF document text
    • https://novahealthclinic.ca/userfiles/file/gunemumisu.pdfIn PDF document text
    • https://fnb-concepts.com/images/uploads/files/misakonodojotixojoxi.pdfIn PDF document text
    • https://pharma-tools.eu/galeria/file/7332511665.pdfIn PDF document text
    • https://starfoil-mail.nl/uploads/wysiwyg/durasowetozet.pdfIn PDF document text
    • https://planet-pvc.com/upload/files/91509086722.pdfIn PDF document text
    • http://0851gay.org/userfiles/202109file/2021090408071770554.pdfIn PDF document text
    • https://latrinquette.com/upload/editor/file/46755966642.pdfIn PDF document text
    • http://tubemakingmachine.com/uploadfile/files/kesufunesavufakabexij.pdfIn PDF document text
    • http://shimamura-mail-order.com/userfiles/file/83638136928.pdfIn PDF document text
    • https://coil.hk/upload/files/3850338590.pdfIn PDF document text
    • http://elard-group.com/ckfinder/userfiles/files/58753642387.pdfIn PDF document text
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/eb23687ce87e82423418fe471257c3af/letipet.pdfIn PDF document text
    • http://shengnabei.com/uploadfile/file///2021090105575343.pdfIn PDF document text
    • http://topnotchimports.com/ckfinder/userfiles/files/81707635693.pdfIn PDF document text
    • http://degeninhotel.ru/admin/ckfinder/userfiles/files/58086126524.pdfIn PDF document text
    • https://almentispharma.com/ckfinder/userfiles/files/86379109547.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=power+on+phone+without+power+buttonPDF 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_off0000dc27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC27 19092 bytes
SHA-256: dde9969d0164796c4b57382b3951c520391042e8b184f860f2a285e3d224f32f
font_01_sfnt_off00010e4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E4C 10300 bytes
SHA-256: 04b0f87943db7f1b307ca9402c360a41c85efe658ca228cba751f49a1ac9d08c
font_02_sfnt_off0001253d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1253D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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