Malicious PDF — malware analysis report

Static analysis result for SHA-256 6e0a3a918af4c613…

MALICIOUS

PDF

69.4 KB Created: 2021-04-28 20:33:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 515ac48daae856e6656e05a59bd4cfbe SHA-1: 40ecb1bd45b9e4be61a7f449bdf1c53d6fa8ca83 SHA-256: 6e0a3a918af4c613d57cb0997f0f482361bb09c1656ff97ca14334217cc36d05
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, flagged as a link farm, and is detected as malicious by ML classifiers and ClamAV. The primary malicious URL identified is https://midufefew.ru/strik?utm_term=custodian+of+records+affidavit+georgia, suggesting a phishing or malware distribution attempt. The document body, though heavily obfuscated, indicates a potential lure related to legal documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://midufefew.ru/strik?utm_term=custodian+of+records+affidavit+georgia
    • https://cdn-cms.f-static.net/uploads/4487631/normal_6062d4c03ac98.pdf
    • http://kazexajisodibu.medianewsonline.com/74999215682.pdf
    • https://cdn-cms.f-static.net/uploads/4467003/normal_6029094d2a478.pdf
    • http://pekibimige.mygamesonline.org/jurnal_politik_malaysia.pdf
    • http://nezowigivomi.scienceontheweb.net/clasificacion_de_los_asientos_contables.pdf
    • https://cdn-cms.f-static.net/uploads/4481417/normal_6019d9d4a99ef.pdf
    • http://fawikenaxalu.scienceontheweb.net/unlock_ipod_nano_3rd_gen.pdf
    • http://wuwudikosegukem.mypressonline.com/assessing_critical_thinking_skills.pdf
    • http://ladirojenovezoj.mygamesonline.org/80583072970.pdf
    • http://lejifip.sportsontheweb.net/tomb_of_annihilation_dm_screen.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://bc80c028-b71a-4936-8b52-739d97125464.filesusr.com/ugd/fb4f66_9da57cb4383d4b6f899852c303fdc164.pdf?index=true
    • http://bitines.myartsonline.com/dental_handpiece_maintenance.pdf
    • https://9d76d0c6-5807-43ac-a2ba-7b4112d1a20a.filesusr.com/ugd/5cd33b_69db913eaa894d26b1a179553ad28e9c.pdf?index=true
    • http://mobukug.myartsonline.com/pupegisiwadadif.pdf
    • https://88966db1-4a83-4446-b941-f65022a6235f.filesusr.com/ugd/928e0f_79ab98afd3fd4bd197b492f65b7073cb.pdf?index=true
    • https://f72e0e13-a873-49c5-9cb5-3c2848b8c5b2.filesusr.com/ugd/f8ba4b_1a7f6e4b5190443c89821d40dcfe0a1b.pdf?index=true
    • https://992bddda-184d-467f-a815-0165b41a2208.filesusr.com/ugd/69695d_7f7f8b302bb64c088dc092884707b317.pdf?index=true
    • http://nivuzujanux.myartsonline.com/atlas_anestesia_regional.pdf
    • https://123949be-7110-4ba3-a240-a7df06fb38ce.filesusr.com/ugd/80fd5d_82e1b5061ad24f53a204faeddce32a62.pdf?index=true
    • https://190d602c-e74a-4ea1-b1d2-d722d7947d0f.filesusr.com/ugd/1eddd4_2a8d13621a90418b8e0d73b33c500dce.pdf?index=true
    • https://2a4b29e6-a790-453e-81e7-e8b9caf2c27b.filesusr.com/ugd/bf0735_c62f49c64d98433684714e7f132cfa55.pdf?index=true
    • https://510b81f6-be4e-4e40-9acf-3f60af495837.filesusr.com/ugd/5f226b_a70f6901ab3245f48b5b70356823d0dd.pdf?index=true
    • 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://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d3e3.bin
4519c9b7007d91ec9cfe5743c318527058374c93e8f8dcd8109b76e391670231		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD3E3 5120 bytes
font_01_sfnt_off0000e564.bin
bf86a5bdc5d7fb32e73ee8682c1e09ed689936fc09969f7bb9ad3ec89a4df160		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE564 10180 bytes

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