Malicious PDF — malware analysis report

Static analysis result for SHA-256 c58df0df11279843…

MALICIOUS

PDF

90.6 KB Created: 2021-01-20 00:34:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: c4109a8b57dd31911a1768ded415f2c5 SHA-1: ea306d71e61b8ba0cb818e82dbbd6960390067ab SHA-256: c58df0df11279843e2fc57e192b25c97cfacfd1bbd425619c73c722e51b76374
96 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was flagged as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. The document body, though heavily obfuscated, suggests a lure related to 'Directed reading worksheet answers'. An external URI pointing to 'seumenha.ru' was extracted, which is likely part of the malicious payload delivery or phishing attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://seumenha.ru/123?utm_term=directed+reading+worksheet+answers PDF link annotation
    • https://cdn.sqhk.co/mowanideju/hfiaif2/40603637948.pdfIn PDF document text
    • https://site-1178548.mozfiles.com/files/1178548/pupiralasadomukisin.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4462345/normal_5ff366b99ee11.pdfIn PDF document text
    • https://cdn.sqhk.co/berovanova/ijhqQhe/how_to_make_a_spiral_rainbow_balloon_arch.pdfIn PDF document text
    • https://site-1176262.mozfiles.com/files/1176262/turn_based_hex_war_games.pdfIn PDF document text
    • https://cdn.sqhk.co/vujenibolo/gjzhdU3/76700229670.pdfIn PDF document text
    • https://site-1175508.mozfiles.com/files/1175508/96388000005.pdfIn PDF document text
    • https://cdn.sqhk.co/dowusutitozi/gdnbEmd/b2c_marketing_strategies_on_social_media_project.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4468843/normal_5fc5b0f0f388d.pdfIn PDF document text
    • https://cdn.sqhk.co/noperizapewo/a9ulKhe/72383644979.pdfIn PDF document text
    • https://cdn.sqhk.co/letinumi/GljaMgd/light_it_up_like_dynamite_lyrics_2020.pdfIn PDF document text
    • https://site-1166725.mozfiles.com/files/1166725/vujizixevuwodoxebatu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/jufinanamek/commands_for_ark_xbox.pdfIn PDF document text
    • https://s3.amazonaws.com/lomiwexuva/xoburavolidawubali.pdfIn PDF document text
    • https://s3.amazonaws.com/bugutaj/torijodizobomefunaz.pdfIn PDF document text
    • https://s3.amazonaws.com/sutawowirosuvuv/bapu_zimidar_songs_ringtone.pdfIn PDF document text
    • https://s3.amazonaws.com/musoxifuvitalo/spotify_music_apkpure.pdfIn PDF document text
    • https://s3.amazonaws.com/vuraradaso/interstellar_imdb_parents_guide.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_off00011acc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11ACC 2940 bytes
SHA-256: 5abd1102bbb49cd9fee3e8c7db4f4b96944035d8cd52b1c4794f50b825db5b40
font_01_sfnt_off00012558.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12558 5324 bytes
SHA-256: 32410bf8e2d9adf32dc5abf3e3adf03aada080cbe9f7a7c88f1d49ccf4ff22d2
font_02_sfnt_off00013787.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13787 10892 bytes
SHA-256: 144953cb30073b92290d27aa1326e6236bb2439fa210e91c4001f86850139154

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