Malicious PDF — malware analysis report

Static analysis result for SHA-256 da30b6ef4a7638c0…

MALICIOUS

PDF

76.3 KB Created: 2021-03-23 21:29:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 46ceb50d5b40cbea8befc9b283d24047 SHA-1: 7f9c131206d07b4ace31adeacdcbce1ef81949d5 SHA-256: da30b6ef4a7638c02358252430bd9a7f0d812237a4fd63c94a387c0fe03de8ba
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, identified by the PDF_SEO_LINK_FARM heuristic, directing users to various websites. The ML_NYX_PDF_MALICIOUS and ClamAV detections confirm its malicious nature, with ClamAV specifically identifying it as Pdf.Phishing.Trojan. The embedded URLs suggest a phishing or malware distribution attempt, likely initiated via spearphishing attachment.

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://lozipotod.ru/123?utm_term=microsoft+excel+worksheet+definition
    • https://static.s123-cdn-static.com/uploads/4369933/normal_6007b98bc1ea4.pdf
    • https://cdn.sqhk.co/ranemagesoga/jhbmbjb/27455579929.pdf
    • https://cdn.sqhk.co/gorubabor/geCdBha/json_formatter_python_command_line.pdf
    • https://cdn.sqhk.co/xawobovuji/ieic1hd/74010279034.pdf
    • https://liduwofixuxobef.weebly.com/uploads/1/3/0/7/130739348/doniwabemomudoja.pdf
    • https://gimituwemowi.weebly.com/uploads/1/3/4/8/134872285/kizunaludopirov-magipudozi-letef-lekoxuduge.pdf
    • http://ladyso.ru/754605351371i7o4.pdf
    • http://usacreditreport.info/south_carolina_dmv_office_near_mep0g8b.pdf
    • https://fukuwere.weebly.com/uploads/1/3/5/3/135395065/bogezigiterir-pilop-xazez-rakunojivereb.pdf
    • https://cdn.sqhk.co/dubagelojuwe/jihier2/master_craft_world_crafting_game_descargar.pdf
    • https://cdn-cms.f-static.net/uploads/4394077/normal_6021cd7b1804f.pdf
    • https://toziraza.weebly.com/uploads/1/3/4/5/134506396/2381661.pdf
    • https://cdn-cms.f-static.net/uploads/4413570/normal_5fd184ff7f25c.pdf
    • https://cdn.sqhk.co/gizivapejoko/ieqiSmI/pozavuvopetukimadebili.pdf
    • http://jojazinex.mygamesonline.org/zelijipiza.pdf
    • http://jijomaj.getenjoyment.net/88414126245.pdf
    • https://cdn-cms.f-static.net/uploads/4483337/normal_6031f41d07826.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/ed295f9d-a745-4502-aa11-fef0e495a249/nuremevofuzafogemudof.pdf
    • http://mozutulobiris.onlinewebshop.net/candlestick_patterns_cheat_sheet.pdf
    • http://xogijowag.onlinewebshop.net/radodagatoredizebo.pdf
    • https://uploads.strikinglycdn.com/files/85129fda-2d06-48c9-ba0d-d83d6811ce17/its_how_you_make_me_feel_lyrics.pdf
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ded9.bin
4cdb36a60b6348174a1c641c8c96637176f9bed64ced94526a17b7ae1ba0bed3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDED9 4916 bytes
font_01_sfnt_off0000ef96.bin
7fada5585977e833b2924c1291fa8d20632e78c935d5b9498dc8d9304132a0ce		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEF96 11180 bytes
font_02_sfnt_off000115cc.bin
d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378		 pdf-font-stream PDF embedded font (sfnt) at offset 0x115CC 4324 bytes

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