Malicious PDF — malware analysis report

Static analysis result for SHA-256 d99298a1fac538a5…

MALICIOUS

PDF

84.2 KB Created: 2021-04-05 17:18:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: c7539b07d3375dd59cd895d5ea0c4abf SHA-1: eb3909c3646d82084b456785302de4e03b73f16a SHA-256: d99298a1fac538a5d2ba1d4e693b752b7433d201a8a81496efca7199b7a27d17
96 Risk Score

Malware Insights

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

The file is a PDF document identified as malicious by ClamAV and an ML classifier. It contains an embedded URI pointing to 'https://zajinet.ru/award?keyword=tutorial+of+c+language+for+beginners+pdf', which is likely used for phishing or to download a secondary payload. The document body, though heavily obfuscated, suggests a lure related to a 'tutorial of c language for beginners pdf'.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://zajinet.ru/award?keyword=tutorial+of+c+language+for+beginners+pdf PDF link annotation
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/5c6b332c-5fda-4215-84c1-29acaa207da4/53915708362.pdfIn PDF document text
    • https://s3.amazonaws.com/lefemijip/bawevemojugerefomugil.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bae4981b-c337-4e5d-b018-946e5846b3c9/my_keurig_machine_stopped_working.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f1e9816d-893d-4d33-8a02-59a0911f8b77/incantation_and_dance_john_barnes_chance.pdfIn PDF document text
    • https://s3.amazonaws.com/gezizefefififa/33753394923.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a490d78a-c848-4e50-8064-c3988abf9f05/mercury_outboard_engine_service_near_me.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0ed6dcc3-2ed7-4c26-bcf5-059527b05559/zepikimivawenufexova.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/89189a82-506a-4963-80ea-6358fa5f1693/55195103965.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e3eddca9-5974-4e86-9453-2d6b35ecfe73/fawotuj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ec3d18cd-cadb-4529-94fa-57b2fe0cc43c/26836915047.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/efac68fb-9f09-4485-b42f-51856da541c1/the_collection_2012_full_movie_download_in_hindi_filmyzilla.pdfIn PDF document text
    • https://s3.amazonaws.com/jiwotarotavuz/795399168.pdfIn PDF document text
    • https://s3.amazonaws.com/niporofez/cash_and_carry_salem_or_hotsheet.pdfIn PDF document text
    • https://s3.amazonaws.com/vapelurowar/bootstrap_form_template_django.pdfIn PDF document text
    • https://s3.amazonaws.com/xakusineba/how_to_replace_kitchenaid_mixer_speed_control_plate.pdfIn PDF document text
    • https://s3.amazonaws.com/bizamesuwepe/41522316933.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dd0df2ab-1817-421e-855d-b58e2bbd846b/schwinn_stationary_bike_amazon.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8996561e-bb8b-4ed5-8258-42a289643fe7/introduction_to_management_science_13th_edition.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ef02914f-d5da-4f21-b458-1c79917dea9c/levigikezilemonutuxorefo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fc4f6fbe-feda-4efb-8fad-110b3b4a1fd1/30931932274.pdfIn PDF document text
    • https://s3.amazonaws.com/mogedozara/colligative_property_questions_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/203a0d5d-8bdb-4591-9af4-795c4a2e9d3f/nato_phonetic_alphabet_examples.pdfIn PDF document text
    • https://s3.amazonaws.com/lixasifasi/adjectives_describing_people_s_character.pdfIn PDF document text
    • https://s3.amazonaws.com/nitizobuv/classifying_matter_worksheet_learning_the_elements.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/27b18098-e87e-4b47-98d5-cab82b8a1c56/how_to_build_a_breakfast_nook_bench_with_storage.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_off0001076a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1076A 5412 bytes
SHA-256: 200f6b85e7c432caca8ee24a1814a9cc8f2b791fb68dda90ab43f6e8187c1443
font_01_sfnt_off000119d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119D2 12308 bytes
SHA-256: 80e04278fd08760519f7173ffaefe8c1c76fee15b9c49229b89ad75045ebaaaf

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