Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5c408dfba66ea38…

MALICIOUS

PDF

70.5 KB Created: 2021-02-23 00:25:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: ebfe4fb4c2b9bd09554025f9b0ccef3b SHA-1: aa99323834527911e3ddac96cc79fa7e47d8a3e1 SHA-256: d5c408dfba66ea38e76c4846d7db7c2af07a8bfd82b5309d8e247766e1006037
136 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The file is a PDF document that contains an embedded URL and a heuristic firing indicating a security bypass instruction, suggesting the user disable antivirus. This, combined with the ML classifier and ClamAV detection, strongly indicates a phishing or trojan delivery attempt. The embedded URL is likely used to download a second-stage payload.

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
  • Security software disable instruction high SE_SECURITY_BYPASS
    Document instructs the user to disable antivirus or security software — unusual for ordinary documents and high-risk in an unsolicited file
  • 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://crophysi.ru/123?utm_term=call+of+cthulhu+rpg+pdf+pt+br PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4453891/normal_6007b0758b083.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388426/normal_5fe1b7f139639.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381289/normal_60221b58e2615.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481831/normal_6011f5c5e5178.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393483/normal_5fc9054f25c63.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/tozaduliwubega/calling_all_angels_sheet_music.pdfIn PDF document text
    • https://s3.amazonaws.com/gozilum/carcassonne_bridges_castles_and_bazaars_rules.pdfIn PDF document text
    • https://s3.amazonaws.com/zasepo/1519476424.pdfIn PDF document text
    • http://mupelaj.rf.gd/geduwadenaluxidor.pdfIn PDF document text
    • https://s3.amazonaws.com/lusegokaves/hack_wifi_zte_di_android.pdfIn PDF document text
    • https://s3.amazonaws.com/jukoxisojow/secure_online_payment_platforms.pdfIn PDF document text
    • http://xipipowateselok.epizy.com/dozezizifu.pdfIn PDF document text
    • https://s3.amazonaws.com/tomaxade/69236412974.pdfIn PDF document text
    • https://s3.amazonaws.com/gavobawum/she_lays_down_the_1975_sheet_music.pdfIn PDF document text
    • https://s3.amazonaws.com/bomifabipi/how_to_listen_to_the_highest_quality_music.pdfIn PDF document text
    • http://kabasefojegozaf.epizy.com/pusozababij.pdfIn PDF document text
    • https://s3.amazonaws.com/livivuvuwugeb/attack_on_pearl_harbor_game_free.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d6b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6B5 5284 bytes
SHA-256: ac757614c71cfa9266352861012661aa0b766093d57d40f2900f5981964372a3
font_01_sfnt_off0000e8a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8A2 10772 bytes
SHA-256: 42082ec6aed47adcb066e5bd2205e7a96bcb1d2be60705b17f6f3c98e93a937a

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