Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8f61cf2c435b463…

MALICIOUS

PDF

71.0 KB Created: 2021-02-16 03:41:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 5ebb8375f46ec00ebc4a97af9063451d SHA-1: 98b7500bf585e7927fc1dc842928dcdabca23f8a SHA-256: d8f61cf2c435b46356f42ed8b3c59eef3f3c75bdf2658cd9fdcd2c79a47930be
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including ML and ClamAV, as malicious. It contains numerous external URIs and is described as a link farm on disposable hosting, indicating a phishing or malware distribution attempt. The presence of embedded URLs suggests an attempt to redirect users to malicious sites like http://basiditdcf.space/tutafuwoxifubevaser7dtn.pdf.

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://seumenha.ru/strik?utm_term=what+reading+level+is+tom+sawyer PDF link annotation
    • http://basiditdcf.space/tutafuwoxifubevaser7dtn.pdfIn PDF document text
    • http://copyrightram.net/59068307417p87r6.pdfIn PDF document text
    • http://bumaga.bz/zolewepizolimiliguwopezi9wnyp.pdfIn PDF document text
    • http://hookup153.space/blockchain_programming_pythonj5bg9.pdfIn PDF document text
    • http://strahuemsya.info/34110696781t9lo4.pdfIn PDF document text
    • http://50offshop.pro/xibovetatehhffa.pdfIn PDF document text
    • http://dihtyar.online/896620824344jn07.pdfIn PDF document text
    • http://winsl.space/ct_course_full_formopujf.pdfIn PDF document text
    • http://pitushok.space/ascii_art_generator_free_full_versionjqwh8.pdfIn PDF document text
    • http://molotkov.site/gacha_life_clothes_edit_hoodieryfv0.pdfIn PDF document text
    • http://bezprovodov.guru/pdf_editor_text_online6vxcg.pdfIn PDF document text
    • http://smm-target.ru/idle_town_chords_conan_grayadbwt.pdfIn PDF document text
    • http://nikaold.site/vumixevqime.pdfIn PDF document text
    • http://creditscorecard.info/consumer_reports_username_password_2018k4fag.pdfIn PDF document text
    • http://remontnatali.ru/julia_serano_whipping_girl0zspc.pdfIn PDF document text
    • http://card2card-perevod24.site/borror_architectural_review_form8l2wf.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vajitefafuxuz.epizy.com/c_string_format_datetime_yyyymmdd.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_off0000d7d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7D7 5504 bytes
SHA-256: 8ae6a64fc897466099864d512711a44fdb5a830467ce651b684196fa326fa78d
font_01_sfnt_off0000ea82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA82 10592 bytes
SHA-256: 24b3ec662fd9c0b99c3bdbb4bb420f9eebd5fc8d11db5bb681685c88caaa056c

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