Malicious PDF — malware analysis report

Static analysis result for SHA-256 86c767681d122e62…

MALICIOUS

PDF

73.4 KB Created: 2021-09-19 00:09:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: cfe5f7f408831279723e68097890d3d1 SHA-1: 83a4617740fa3d529672f62797a39b88ca56d9be SHA-256: 86c767681d122e62528d0cec4d26bf3ecaf6d6aaa05929a054277c810f5c19ee
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, and exhibits characteristics of a link farm. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a high number of distinct, disposable hosts, suggesting an attempt to obscure the true destination or distribute content across many low-reputation sites. The presence of embedded URLs and the 'SE_CALLBACK_LURE' heuristic suggest a phishing or scam attempt, likely leading to further malicious content or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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.
  • 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.
  • 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://dakmoto.cz/obrazky/file/17457419833.pdf In PDF document text
    • http://zbigniewrodak.pl/galeria/file/lobawevos.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/63aa90334b2f78dc6a9d8e66cfce96ff/xutumufoj.pdfIn PDF document text
    • http://domuran.pl/files/file/vogowonuvovujuvozi.pdfIn PDF document text
    • http://dges.in/userfiles/file/22667824006.pdfIn PDF document text
    • http://xn--80aafkatcapceshpicpg3h.xn--p1ai/pict/file/33567751813.pdfIn PDF document text
    • http://ilkconstruction.com/Images/Media/files/jipakowumuxiranamiwu.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613407353d3ef---18524848759.pdfIn PDF document text
    • http://ankamet.com/userfiles/file/9024735446.pdfIn PDF document text
    • http://clinicaveterinariagussago.com/userfiles/files/kazokisifupuno.pdfIn PDF document text
    • http://dogoducthien.com/uploads/files/mimisizoseratorajese.pdfIn PDF document text
    • https://red-adlay.com/upload/files/270055725.pdfIn PDF document text
    • https://thibiditrading.com/public/userupload/files/57454963610.pdfIn PDF document text
    • http://kxnjl.com/userfiles/files/degudiraweko.pdfIn PDF document text
    • http://fitviewer.biz/files/file/fidadorixowade.pdfIn PDF document text
    • https://tractorpulling-emmeloord.nl/upload/file/bosewe.pdfIn PDF document text
    • http://ltpbetel.ro/userfiles/file/1185653867.pdfIn PDF document text
    • http://opuspointpartner.com/ckfinder/userfiles/files/rumupasi.pdfIn PDF document text
    • https://psfund.org/public/uploads/files/cms_files/92509362676.pdfIn PDF document text
    • http://lagrupacio.cat/file/puxadovetogodarod.pdfIn PDF document text
    • http://daehwa.info/uploaded/file/temetewavobalalusuwep.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=thinkdiag+mod+apkPDF 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_off0000bc28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC28 17300 bytes
SHA-256: e87c6aa32e85a75894dcec5b9e84bece635669e01584cb9087c1dc337479d068
font_01_sfnt_off0000e979.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE979 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010190.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10190 10348 bytes
SHA-256: 21fd8e3f11eda463d745332801fc7da432ff3da96f4dfb587e851083e0d51b69

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