Malicious PDF — malware analysis report

Static analysis result for SHA-256 c42da062d06d7f51…

MALICIOUS

PDF

82.9 KB Created: 2021-03-19 12:16:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: d560676018ab55684eaf4f435afebcb8 SHA-1: 0aabcccf36e8d3c7ede9432a10c20c506e2ee14d SHA-256: c42da062d06d7f515e7c18b2b499ad467e213915dfcc78f8c71cf868dddb4036
126 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. The document body, though heavily obfuscated, contains references to 'wkhtmltopdf' and a URL that appears to be a link farm, suggesting a phishing or malware distribution lure. The presence of embedded URLs further supports the attack pattern of directing users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://soxebez.ru/wix?keyword=cuadro+comparativo+en+blanco PDF link annotation
    • http://getarileduvuda.22web.org/lewonuna.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470982/normal_6033ba8e8c9d3.pdfIn PDF document text
    • https://cdn.sqhk.co/gutemokerezo/hjgUgic/barratt_impulsiveness_scale_scoring_guide.pdfIn PDF document text
    • https://cdn.sqhk.co/dikonutudibe/aZzjjgg/35676632606.pdfIn PDF document text
    • https://cdn.sqhk.co/dosovejozeb/GoHjaja/best_launcher_for_android_10_gestures.pdfIn PDF document text
    • https://cdn.sqhk.co/muzubasiwu/ejghe49/73694879942.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366620/normal_5ff28c284c245.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pejulok.epizy.com/wigafokezujijuxupesawa.pdfIn PDF document text
    • https://s3.amazonaws.com/nimuwet/xiwuz.pdfIn PDF document text
    • http://wetovokerug.epizy.com/ielts_speaking_practice_questions.pdfIn PDF document text
    • https://s3.amazonaws.com/jupevuxirapi/backup_restore_android_without_root.pdfIn PDF document text
    • http://bobepenuf.rf.gd/97833136911.pdfIn PDF document text
    • http://mowiwanafiv.epizy.com/troy_bilt_mower_blades_42.pdfIn PDF document text
    • http://budusujebosew.epizy.com/best_self_tanner_for_face_contouring.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/98b46735-cff3-4daf-ad8b-6a09e3d31842/6003451575.pdfIn PDF document text
    • http://bawibas.rf.gd/number_worksheets_1-_10.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4ba0b2ea-89eb-4ca8-8a86-8f28b32d5f5f/ezdrummer_2_metallica_sound.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://scripts.sil.org/OFLIn 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_off0000ef16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF16 5148 bytes
SHA-256: 2c03b2e9a2fc65158ac6a4c3f723a0d03db2d055e2df8a573a0b98ddd928a719
font_01_sfnt_off0001007b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1007B 11812 bytes
SHA-256: 71b91f3fb7ecc5467427e97c20a9a203cf85b09a5f01efebe75afa509fd7dde7
font_02_sfnt_off00012728.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12728 16284 bytes
SHA-256: 74c97822b098bdb2bed9cda499cc89b711e14c7854103841cf41ca534e61ae04

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