Malicious PDF — malware analysis report

Static analysis result for SHA-256 c2db820eb8938b3d…

MALICIOUS

PDF

68.3 KB Created: 2021-02-15 03:40:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 75d733e5c812be497645a5e28ac35197 SHA-1: 07d8d3b9ffc535d3894a9cf7921358084884c3bb SHA-256: c2db820eb8938b3df635207a319a69a2c8aa04efa8fffb1d4b2591bc60ab5566
184 Risk Score

Malware Insights

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

The PDF contains embedded links to known malicious redirectors and disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body, though partially corrupted, suggests a lure related to educational worksheets, which is a common tactic for phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/wix?keyword=bill+nye+rocks+and+minerals+worksheet+answer+key In PDF document text
    • http://wajufogisabo.iblogger.org/86676646830.pdfIn PDF document text
    • http://tvoeobrazovanie.fun/air_conditioning_principles_and_systems_pitaboz9m.pdfIn PDF document text
    • http://copyright-securityx.com/bauer_air_compressor_junior_2_manualg91k2.pdfIn PDF document text
    • https://cdn.sqhk.co/kofuvufexo/yifjaf4/barber_cuts_2020.pdfIn PDF document text
    • http://noxerazomefo.iblogger.org/mavixopimutawanu.pdfIn PDF document text
    • http://reactivascotia2020.com/powerpoint_design_templates_engineeringey9j0.pdfIn PDF document text
    • http://kernig.store/convert_file_to_excel_worksheetvgczw.pdfIn PDF document text
    • https://cdn.sqhk.co/xuxiropuwomo/ifUTXN9/tujuxinunax.pdfIn PDF document text
    • http://tevubirufizibun.iblogger.org/56499016560.pdfIn PDF document text
    • http://tegor.xyz/bombsquad_mod_apk_1._4._149nyzho.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://zapujeromaralim.epizy.com/hungry_shark_cheats.pdfIn PDF document text
    • http://jupasugego.rf.gd/analysis_of_cabinet_battle_1_answers.pdfIn PDF document text
    • http://genenapukiral.epizy.com/a_gentleman_full_movie_480p_bluray.pdfIn PDF document text
    • http://zagopemolal.rf.gd/drawing_music_symbols_worksheet.pdfIn PDF document text
    • http://sejojoxo.epizy.com/bekhayali_mein_song_video.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c21f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC21F 5272 bytes
SHA-256: 3175f0d755567dbf87f9cafcbf750b145ffcce0e06f38c2737e353873c7d9932
font_01_sfnt_off0000d3eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3EB 9836 bytes
SHA-256: 46d563fdc0b5d5991261a8e03bfdfe936ec7f220d7b7dff0d838da2096f3f9e3
font_02_sfnt_off0000f5a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5A3 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e