Malicious PDF — malware analysis report

Static analysis result for SHA-256 e43b4c145ea2d97d…

MALICIOUS

PDF

90.1 KB Created: 2021-03-09 10:31:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-13
MD5: f1677136b359957ac17878643e650944 SHA-1: 4cfc300cfb6a777161908ce6eb8be2b8269a7101 SHA-256: e43b4c145ea2d97dfd9dde3a8316328f6737629d8dd7d630983da37fe1be7ef3
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm or redirection mechanism to host malicious content. The document body, though heavily obfuscated, appears to be a lure related to educational worksheets, aligning with common phishing tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • 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://maypoin.ru/wix?keyword=salts+and+solutions+naming+compounds+worksheet PDF link annotation
    • http://nanebaxexob.getenjoyment.net/how_to_find_tension_in_a_string_over_a_pulley.pdfIn PDF document text
    • http://zuvels.xyz/sozivozavorijegapipaxnulff.pdfIn PDF document text
    • https://cdn.sqhk.co/zasemewiti/gghgI2v/79431404732.pdfIn PDF document text
    • http://wugumonisukanib.sportsontheweb.net/6882736874.pdfIn PDF document text
    • http://saroforati.medianewsonline.com/best_love_story_movies_of_all_time.pdfIn PDF document text
    • http://titoto.xyz/midstream_college_school_uniformjuolb.pdfIn PDF document text
    • https://cdn.sqhk.co/sotatixorawi/biiigjc/dipazobi.pdfIn PDF document text
    • http://fisijowizaraxot.iblogger.org/kutapenoxa.pdfIn PDF document text
    • http://alphabitx.com/zigoloxuxcg89h.pdfIn PDF document text
    • https://cdn.sqhk.co/laripikiwafo/fhiyhfv/dixie_d_amelio_s_new_music_video_remix.pdfIn PDF document text
    • http://smartroom.pro/cfa_level_1_exam_weightstieoa.pdfIn PDF document text
    • http://pojoxigi.iblogger.org/reading_comprehension_skills_worksheets.pdfIn PDF document text
    • https://cdn.sqhk.co/giripiponi/jgeidjb/97269198155.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://wofaketizezoja.epizy.com/all_my_life_krezip_sheet_music.pdfIn PDF document text
    • http://wowutuzineko.myartsonline.com/cen-tech_3_in_1_portable_power_pack_troubleshooting.pdfIn PDF document text
    • http://jipowefata.epizy.com/gulabi_aankhen_video_song.pdfIn PDF document text
    • http://zidufixeda.epizy.com/diagrama_de_fases_agua_sal.pdfIn PDF document text
    • http://nejesezape.myartsonline.com/rekanudi.pdfIn PDF document text
    • http://wejajesenopezoj.onlinewebshop.net/garmin_drivesmart_55_lmt_5.5_gps.pdfIn PDF document text
    • http://vawirir.atwebpages.com/mechanically_inclined_jeff_anderson.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_off00011566.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11566 5628 bytes
SHA-256: 40382dc8f03934e5bd5f1a1b597d09d08296ca914c7c082922d622beac406f27
font_01_sfnt_off0001285c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1285C 10760 bytes
SHA-256: bd614050adedf89ee51b91acef667d3a985b0b87188f6230aed135f4ea6dd21b
font_02_sfnt_off00014cd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14CD8 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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