Malicious PDF — malware analysis report

Static analysis result for SHA-256 10341c89509ff8e6…

MALICIOUS

PDF

81.1 KB Created: 2021-09-19 05:14:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0ea96bfb81fe77796c10304790825e22 SHA-1: a7670e33fcb33562d5325dbc17bae9436bd40b7b SHA-256: 10341c89509ff8e687646369a1610eefea0c02ca6292f2c47f687acde20063cf
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple heuristics indicating malicious intent, including ML classification and ClamAV detection as a phishing trojan. It presents urgency and payment-related lures, directing users to a link farm with numerous disposable domains. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to trick users into visiting malicious sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 8

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://accuratesearch.com/userfiles/file/45989424022.pdf
    • https://jhservice.net/imagenes/galeria/files/94152727164.pdf
    • http://vouchertiket.com/airplane/ckeditor/uploads/files/158859168.pdf
    • http://stauarchitetti.eu/userfiles/files/mavosi.pdf
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16134eacf6d40a---2196955933.pdf
    • http://santeh.md/img/files/ririxemurabizinebo.pdf
    • http://yuilchem.com/userData/board/file/xaberobudavumujudozuvowij.pdf
    • http://anhuifan.com/upload_fck/file/2021-9-10/20210910181125400520.pdf
    • https://easypayindia.in/userfiles/file/gilijofixifoninarizel.pdf
    • http://onlinetalk.jp/app/webroot/img/fckfiles/file/xusetes.pdf
    • https://ceylanotel.com/firma/files/72921646475.pdf
    • http://heatexchangersolution.com/upload_fck/file/2021-9-16/20210916133317870875.pdf
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/16135e0656a6a2---kojovovuzawimufosixobir.pdf
    • http://sjatupornservices.com/file_media/file_image/file/vasowugukidumugobexewu.pdf
    • http://xn--2-7sbddqrtdw3be6jua.xn--p1ai/userfiles/file/nupemaduni.pdf
    • http://spharma.ua/files/file/45422314821.pdf
    • http://ciatic.saintelserver.com/archivos_editor/file/86108506687.pdf
    • http://czechdidgeridoo.com/admin/upload/file/mafowufogogisubolat.pdf
    • https://luminex.pl/upload/file/83864835321.pdf
    • http://sanphamhanquocymy.com/uploads/files/79015563297.pdf
    • http://msslink.ru/userfiles/files/74750096256.pdf
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/10138371690.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=parking+collection+services
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d82e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD82E 16792 bytes
font_01_sfnt_off0000f040.bin
1810d4ffe8021bdd55f1769a6e6c6e839135b2736152a386b511a7812b80ec05		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF040 17800 bytes
font_02_sfnt_off00011e40.bin
ef2597bf7c62bd3d8605cf9e85e3ea4d435c04dc7a48348a9e261cb756c2f05b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11E40 10564 bytes

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