Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ca0caf1a2e2c33d…

MALICIOUS

PDF

73.1 KB Created: 2021-06-13 01:16:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: fa5431109c9f0ba8882eb0a77954dade SHA-1: 3333d7b2beb90cf68dfe914e5fa64b9bbf05a651 SHA-256: 4ca0caf1a2e2c33d01de765ea5f59ecb422cc17dd41334b50bb49586fc504807
126 Risk Score

Malware Insights

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

The PDF contains an embedded URL pointing to 'wastran.ru', which is flagged as malicious. Heuristics indicate the PDF acts as a link farm and is classified as phishing malware by ClamAV. The ML classifier also strongly indicates maliciousness, suggesting the document's primary purpose is to redirect users to a harmful site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://wastran.ru/pbw?utm_term=set+theory+exercises+and+solutions PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4504839/normal_6050399eeb1cd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379363/normal_60132fd4bcb69.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/1082add1-11c6-48a8-a88d-d2fafbd8d5f0/information_technology_engineering_salary_per_month.pdfIn PDF document text
    • http://zobafolu.pbworks.com/w/file/fetch/144712722/how_to_play_battle_of_the_sexes_board_game_rules.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0db0b3bb-0afc-401d-9ef9-8ea908293d23/kagasekepoka.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ece13c34-7e9b-4278-b99d-89cac5d472a6/24305967767.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6c12f5e5-dba4-47f3-8b63-ffdbafe17219/stock_markets_live.pdfIn PDF document text
    • http://nusuwoxub.pbworks.com/f/remez.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/212d32dc-643a-4705-bcee-189294e589b6/xolun.pdfIn PDF document text
    • http://tagiruxot.pbworks.com/w/file/fetch/145213065/gangs_of_wasseypur_yify.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a2fbac05-aa72-4f7b-8a1c-d08962c65a9f/how_to_gain_muscle_while_burning_fat.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a7db49e5-e145-4e19-b2b1-8d22f684d9c3/jozodevagujamajomuba.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aa373e35-acbd-4944-8edb-0b52819535c0/pufanevalitewoz.pdfIn PDF document text
    • http://pebokuvog.pbworks.com/w/file/fetch/144523728/gta_5_free_shark_card_code_generator.pdfIn PDF document text
    • http://sisagexal.pbworks.com/w/file/fetch/144882831/chapter_3_data_analysis_quantitative_research.pdfIn PDF document text
    • http://nilanom.pbworks.com/f/is_odysseus_an_epic_hero.pdfIn PDF document text
    • http://jiboduxoguv.pbworks.com/f/gagijigugipusagelo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/27554b01-e406-4387-b99d-7b08056cc96f/ocarina_of_time_3ds_master_quest.pdfIn PDF document text
    • http://zuvuzut.pbworks.com/f/certificate_of_recognition_template_word_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_off0000df98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF98 5300 bytes
SHA-256: 3bc100cf43f1756a3d0727cb960b7eaaaecdc715562ab571f5c36751005cc3e1
font_01_sfnt_off0000f1a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1A4 10960 bytes
SHA-256: 537a5b730bae7f9e05f9b712e094194e5ddd1f391a5f6338cf46ca780e4880a5

Open this report in the interactive analyzer, or submit your own file for analysis.