Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f28cc2b7777b590…

MALICIOUS

PDF

73.6 KB Created: 2021-03-08 07:39:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-13
MD5: c4e2fe504d60db1d19b0f588215a7334 SHA-1: 9c118e20b684bc6827912c595a51311a9ede5993 SHA-256: 7f28cc2b7777b590a1711cec0c87b1969eb43aa73340da6ff6f8bf3a6434fbb6
126 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a high-confidence ML classifier and ClamAV, indicating malicious intent. The PDF contains numerous embedded URLs pointing to disposable domains and link farms, suggesting a phishing or malware distribution campaign. The document body, though heavily obfuscated, contains metadata related to 'wkhtmltopdf' and a search keyword, further supporting the lure-based attack pattern.

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
  • 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://lozipotod.ru/wix?keyword=dutailier+replacement+cushions+amazon PDF link annotation
    • http://zavodtriumf.com/mcent_browser_app_androidabh4n.pdfIn PDF document text
    • http://lofuzuwe.22web.org/espresso_english_courses.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4466173/normal_6020fe9c74e7c.pdfIn PDF document text
    • http://flowerport.shop/breaking_news_report_definitionb45fu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410674/normal_603552ef94eff.pdfIn PDF document text
    • http://runivofo.iblogger.org/solving_two_step_equations_worksheet_free.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451970/normal_603dd97d9fad3.pdfIn PDF document text
    • http://lovechat24.club/849539402109jufn.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4412403/normal_5fefdfd23fc09.pdfIn PDF document text
    • http://generalmassage.online/drz400sm_service_schedule9cw50.pdfIn PDF document text
    • http://instapresent.site/mathematical_theory_of_communicationaf6oz.pdfIn PDF document text
    • http://vorgazme.com/can_i_use_my_iphone_as_a_smart_tv_remote_for_a_non1lb0a.pdfIn PDF document text
    • http://setifol.66ghz.com/what_is_religion_based_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/dewazewokib/aplikasi_emulator_android_untuk_pc_ram_2gb.pdfIn PDF document text
    • https://s3.amazonaws.com/tesodagiwor/free_sample_magazine_layout_templates.pdfIn PDF document text
    • http://tuzawuza.epizy.com/happy_birthday_song_punjabi_mr_jatt.pdfIn PDF document text
    • http://poresiz.epizy.com/35030031876.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_off0000e3ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3EA 5220 bytes
SHA-256: b75ffd153b7b87e1cb61ba36cc4e493e620732933a0a6c3e4430eb1c737a3fb2
font_01_sfnt_off0000f58c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF58C 10528 bytes
SHA-256: 1da18fc6343b81b8b4be8113901c24a2782877878b7e9d65643b434b8ed44e44

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