Malicious PDF — malware analysis report

Static analysis result for SHA-256 a08f489c39fcf75f…

MALICIOUS

PDF

74.8 KB Created: 2021-03-03 12:56:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: dc1d0a19d70b0a4af52a44a2d98d71a9 SHA-1: 32be7b0d9402420d661e393d195dbda690bfc3ac SHA-256: a08f489c39fcf75fc9e24a5946b5368cb8d8db25375b07c1b5d622fddd86ada3
184 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains and redirector infrastructure, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were extracted, the structure and embedded links are characteristic of a malicious PDF designed to redirect users to harmful sites.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/wix?keyword=plant+cell+and+animal+cell+diagram+worksheet In PDF document text
    • http://urott-hu.com/dsi_2000_priceydlfv.pdfIn PDF document text
    • http://mybatut.store/power_suit_samusp7hvo.pdfIn PDF document text
    • http://ru-en.xyz/phrases_sentences_worksheetswqbzs.pdfIn PDF document text
    • https://cdn.sqhk.co/vipujitebiki/ajgLhnk/my_game_center_app_disappeared.pdfIn PDF document text
    • http://avit0.pro/coway_air_purifier_lombok_2_manual7xn41.pdfIn PDF document text
    • https://cdn.sqhk.co/xejudawadoni/jcPDgh3/mejubefudemobodir.pdfIn PDF document text
    • http://nubolats.xyz/on_writing_well_william_zinsser_freekvinm.pdfIn PDF document text
    • http://sale20.site/best_app_for_couples_hotel_bookingd2jqv.pdfIn PDF document text
    • https://cdn.sqhk.co/lelogivotosu/eveK7ig/halloween_mask_camera.pdfIn PDF document text
    • http://bijipejip.iblogger.org/beedi_jalaile_jigar_se_piya_song.pdfIn PDF document text
    • http://petrol-v-pol-price.site/boolean_expression_simplification_worksheetirw65.pdfIn PDF document text
    • https://cdn.sqhk.co/rufebumu/mjxjigh/neuron_function_and_structure.pdfIn PDF document text
    • http://topsale.pro/bekunonumakanojizetolobkyv2.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://luremugaxufarup.epizy.com/back_end_programming.pdfIn PDF document text
    • https://s3.amazonaws.com/bisiku/26728205368.pdfIn PDF document text
    • https://s3.amazonaws.com/welanisowari/letter_of_creditable_coverage_blue_cross.pdfIn PDF document text
    • https://s3.amazonaws.com/xijalovelokolep/ajax_form_post.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_off0000e89b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE89B 5508 bytes
SHA-256: 53d036618fdeba0dab82f41f854a73b8cd13f98e6f4639ef28ff929b5ea5d049
font_01_sfnt_off0000fb3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB3C 10020 bytes
SHA-256: 972faea2cd2c4ea62c4b063892c1c5d09bca2851cd59428ed36a627af42c2ae6

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