Malicious PDF — malware analysis report

Static analysis result for SHA-256 de0bdb0fc296224a…

MALICIOUS

PDF

77.7 KB Created: 2021-05-11 04:18:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3c02d895161bd0036e5c4ebe6f0dbbaf SHA-1: 1f6ccd6113a345646f63214452ecc4607ecd516e SHA-256: de0bdb0fc296224ad702385741dbb6e1d71fbd4f2227d5705994ca44c13148d2
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, with one prominent URL pointing to a suspicious domain that appears to be part of a link farm. The document body, though heavily obfuscated, suggests a lure related to educational worksheets, which is a common tactic for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://resalured.ru/strik?utm_term=4th+grade+basic+math+skills+worksheets
    • http://vuvodagedene.scienceontheweb.net/skf_bearing_nomenclature.pdf
    • https://cdn-cms.f-static.net/uploads/4501656/normal_60519d57b9a32.pdf
    • https://static.s123-cdn-static.com/uploads/4450438/normal_6000b05097cce.pdf
    • https://static.s123-cdn-static.com/uploads/4404520/normal_600490fe1fce4.pdf
    • http://kurixuj.sportsontheweb.net/96955326362.pdf
    • https://cdn-cms.f-static.net/uploads/4478669/normal_602daf21b5136.pdf
    • http://fazejajogavu.medianewsonline.com/iowa_state_highway_map.pdf
    • https://cdn-cms.f-static.net/uploads/4475852/normal_5fd10baa02ddf.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://c8019651-2137-4367-b38e-775fff3f8a75.filesusr.com/ugd/fc5a02_bdbffeca5d054812853616840c279b91.pdf?index=true
    • https://s3.amazonaws.com/gewisetug/bunker_hill_security_digital_floor_safe_manual.pdf
    • https://s3.amazonaws.com/xupimaral/direct_indirect_exercises_with_answers.pdf
    • https://s3.amazonaws.com/zemunomipazikez/2000_mercedes_benz_e320_transmission_fluid.pdf
    • https://uploads.strikinglycdn.com/files/bdfdbe05-03d6-4b5a-83d1-cf353c43e0db/how_to_start_an_electrical_engineering_business_after_mechanical.pdf
    • http://gozenabuzixi.onlinewebshop.net/printable_december_2020_calendar.pdf
    • http://satogitexuvo.myartsonline.com/wejoletagumeju.pdf
    • https://f414df59-d0c5-412c-8277-160bd92acc6e.filesusr.com/ugd/055bb3_f877d72e81e34d7ebbef967358ac55d4.pdf?index=true
    • https://s3.amazonaws.com/nezanurugega/80146641098.pdf
    • https://s3.amazonaws.com/pasawexawinogad/wow_classic_warlock_pets_guide.pdf
    • https://uploads.strikinglycdn.com/files/d82d6738-f459-4c24-b566-af4a709d186f/leading_change_john_kotter_2012.pdf
    • https://e5eb5b25-b33c-43e3-82d5-57ab1bf863d8.filesusr.com/ugd/b0c717_ff22381d7ea242d3bfd92594b891c264.pdf?index=true
    • https://s3.amazonaws.com/donarepemi/82537187136.pdf
    • https://081e7fb2-604d-424b-9b75-a58d54a71a44.filesusr.com/ugd/abd6ea_85859ea2415e44b59aeca256feb24419.pdf?index=true
    • https://s3.amazonaws.com/titugome/90963167930.pdf
    • https://s3.amazonaws.com/nelizenejakarug/netflix_app_ipad.pdf
    • https://uploads.strikinglycdn.com/files/415c7e49-f5ad-4a21-9324-47a0ba8a85ca/adobe_photoshop_for_book_cover.pdf
    • https://s3.amazonaws.com/mefadedosuw/uscis_forms_i-_765.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_off0000e4df.bin
476245d7372a6ba6fd6d93cd6fb58727d1f1b64188e7fe51ca5375d0573fbd21		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE4DF 5324 bytes
font_01_sfnt_off0000f70c.bin
a0f5e9f1570f2fd2093380c41b05afd85d312f7a641e95a821cde6173b8fdec5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF70C 10496 bytes
font_02_sfnt_off00011ae3.bin
7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11AE3 4324 bytes

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