Malicious PDF — malware analysis report

Static analysis result for SHA-256 d0e7e59db5495547…

MALICIOUS

PDF

69.5 KB Created: 2021-03-23 15:33:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 8e026a8ade4da9071050c64eaa2ffb8c SHA-1: c25d781bd20effcf4b42aff30a66a71f5d4446e9 SHA-256: d0e7e59db5495547141952ff9a858fe1362504f7d11c9a02a20680889e56e3d8
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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://lozipotod.ru/award?keyword=spehlmann+s+evoked+potential+primer+pdf+download PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4408002/normal_5feb476a56950.pdfIn PDF document text
    • http://umdtheatre.ru/vevidituwurerulipivegotiggsbfq.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374986/normal_6059054f555ea.pdfIn PDF document text
    • http://medicinfo.online/how_much_does_it_cost_per_mile_to_drive_an_electric_car061sy.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4527164/normal_5fed33c2c22a2.pdfIn PDF document text
    • http://danasorajapakop.iblogger.org/holt_algebra_1_practice_workbook.pdfIn PDF document text
    • http://hackins.site/w-_4_personal_exemption_worksheetng9tp.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/rizoli/87335750706.pdfIn PDF document text
    • https://s3.amazonaws.com/lebejos/45878511940.pdfIn PDF document text
    • https://f7cac2f2-528f-490f-9bef-cb2448a877de.filesusr.com/ugd/529ba0_86c87b15ded6437c8148f43a57370f52.pdf?index=trueIn PDF document text
    • http://fukevitadej.epizy.com/mekulanejajuwumerivuwik.pdfIn PDF document text
    • http://xoluriwibifezoz.rf.gd/kleynjans_barcarolle.pdfIn PDF document text
    • http://kijibabekisuni.epizy.com/excel_vba_protect_unprotect_all_sheets.pdfIn PDF document text
    • https://d1159ab4-cbf5-42eb-897b-83a5e94cd7da.filesusr.com/ugd/536122_3fe3ac256ccd48c7b019d0648ad16494.pdf?index=trueIn PDF document text
    • https://67389751-14cc-4ed3-b660-7ef7239e4cc3.filesusr.com/ugd/bb5584_2a5b7fd19bc34c04a3058f5740418dd0.pdf?index=trueIn PDF document text
    • http://vekujekodabudu.epizy.com/how_to_calculate_instantaneous_angular_velocity.pdfIn PDF document text
    • http://nefijojutofad.rf.gd/veposobenubex.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cdf9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDF9 5600 bytes
SHA-256: 1e639711c366dc23c3708995a904e7528f44fef07d793ac860326714e2075ec3
font_01_sfnt_off0000e0e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0E4 11320 bytes
SHA-256: 28c2714a8a80cb6983ba2da608c2a2e0d6d9e9aa0b618dc0f4077a94bde5dc6d