Malicious PDF — malware analysis report

Static analysis result for SHA-256 b690d9a718213af8…

MALICIOUS

PDF

76.2 KB Created: 2021-04-08 00:22:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: db9d2ad3d4f02e14439a5827b7955544 SHA-1: 1a5a95fb6121029df5078d6400c38e74c6ae4bc2 SHA-256: b690d9a718213af8d9f386b1360fc8a3dce944c043d303daedc755d4f89a5b45
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 'Answers to jumble word game'. The presence of multiple external URIs, including one pointing to 'jottigo.ru', strongly suggests the document is designed to redirect users to a malicious site for further exploitation or phishing. No scripts were extracted, but the PDF structure itself contains malicious elements.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://jottigo.ru/123?utm_term=answers+to+jumble+word+game PDF link annotation
    • http://shoop-fl.ru/toy_cube_crush_apk29nxy.pdfIn PDF document text
    • http://mini-cam1.club/economia_comportamental02b62.pdfIn PDF document text
    • http://evromotors.net/briggs_and_stratton_small_engine_repair_manual8i3ed.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4498404/normal_603e6064b63fb.pdfIn PDF document text
    • https://cdn.sqhk.co/turomixo/ggehduO/98259224800.pdfIn PDF document text
    • http://hh666o.site/julovega6zbz3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388272/normal_5fd3d20f584ad.pdfIn PDF document text
    • https://cdn.sqhk.co/kewawukufiju/20qjsjg/30546356080.pdfIn PDF document text
    • http://onlinesos.tech/centre_de_formation_a_distance_bruxelles_aviserri4.pdfIn PDF document text
    • https://cdn.sqhk.co/fofotixoz/EhfbRhg/bluetooth_speaker_deals_of_the_day.pdfIn PDF document text
    • https://cdn.sqhk.co/gipekoma/diafXhi/charlottenburgh_park_summerstown_on.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/gupawupigawono/protect_formatting_in_excel_sheet.pdfIn PDF document text
    • https://s3.amazonaws.com/vipinib/rowenta_ultra_steamer_instructions.pdfIn PDF document text
    • https://s3.amazonaws.com/gotenukevepunin/autoresponder_for_whatsapp_apkpure.pdfIn PDF document text
    • https://s3.amazonaws.com/toliwudalamem/susekowupumazulifumamu.pdfIn PDF document text
    • https://s3.amazonaws.com/dubiditiginowo/sanomajem.pdfIn PDF document text
    • https://s3.amazonaws.com/wifukedot/next_job_application_questionnaire_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/rekorewexidiwo/batman_begins_full_movie_in_tamil.pdfIn PDF document text
    • https://s3.amazonaws.com/mefadedosuw/family_addiction_recovery_worksheets.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_off0000eb6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB6D 5444 bytes
SHA-256: 512a9bab777a80cf0ee6f70ce3b265fccb8a36aab34d77b89cab6a5d457d79f0
font_01_sfnt_off0000fde3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDE3 11024 bytes
SHA-256: bb7dc9ba5d5b1ec6ddcc379d87ebb0ec930f30a86d57fec2f5d47ad822f17a27

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