Malicious PDF — malware analysis report

Static analysis result for SHA-256 cbbace8650f56001…

MALICIOUS

PDF

82.5 KB Created: 2021-09-13 07:11:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: e14128ff25dad67c162764d49bdcfff8 SHA-1: 0518212fcae7fbe57efbc2a769c0d3afd5cdc2fc SHA-256: cbbace8650f560012d404c127dc4c75643de5d39bf9422fd720cb08a89495820
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. Numerous embedded URLs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicate a link farm designed to redirect users to potentially malicious sites. The document body is heavily obfuscated, suggesting an attempt to hide its true nature, and the presence of embedded URLs points towards a phishing or malware distribution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://infrive.ru/uplcv?utm_term=online+io+shooting+games PDF link annotation
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bf4ce3a77a---wuwukabofizogazajasewerod.pdfIn PDF document text
    • http://3e3i.com/UserFiles/file///46134903360.pdfIn PDF document text
    • http://nm-union.ru/ckfinder/userfiles/files/panexiximotosebuw.pdfIn PDF document text
    • https://mariapolis.es/ckfinder/userfiles/files/78578011330.pdfIn PDF document text
    • http://www.mezmat.ru/ckfinder/userfiles/files/nuxoxi.pdfIn PDF document text
    • https://toskov-yordanov.com/userfiles/file/44500485943.pdfIn PDF document text
    • https://distriparkbotlek.nl/userfiles/files/vakinoziwivugikuwuw.pdfIn PDF document text
    • http://allycatering.com/userfiles/55272128937.pdfIn PDF document text
    • http://icbiz.ru/userfiles/file/45159665239.pdfIn PDF document text
    • http://hb-hospital.com/file_upload/fck_upfile/file/jusalibiwimalopamoros.pdfIn PDF document text
    • https://gs-hemeringen.de/ablage/userfiles/files/55840750360.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/67805139120.pdfIn PDF document text
    • http://k1a.ru/images/files/file/xuwivosexawulanesi.pdfIn PDF document text
    • http://ekotop.eu/userfiles/file/8381292600.pdfIn PDF document text
    • https://buyafranchise.org/files/files/jupuxiwijuvewu.pdfIn PDF document text
    • http://coffee33.ru/archive/file/47422995075.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/431deb1983847828c3bb0e320e388833/gipujono.pdfIn PDF document text
    • http://briquettemachinery.com/d/files/15053999471.pdfIn PDF document text
    • http://swiss-ex.com/images/blog/file/46992014653.pdfIn PDF document text
    • https://rosewoodcity.org/nbloom/fckuploads/file/samatexofu.pdfIn PDF document text
    • http://rigdrilling.org/userfiles/file/xulazowoledubeten.pdfIn PDF document text
    • https://powermailer.in/userfiles/file/sekijavanokor.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_off0000de03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE03 10480 bytes
SHA-256: cb231cdadd406f36a9b3c0c149928e6517f9f5a6b009fc5e6dfb1802e3e0d9b6
font_01_sfnt_off0000f5a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5A5 17904 bytes
SHA-256: 0cde6cc5d156607ff335cb67b3da30ee49741fbb7625bbe280952e5a647fe9b3
font_02_sfnt_off00012474.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12474 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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