Malicious PDF — malware analysis report

Static analysis result for SHA-256 99bf530153decccd…

MALICIOUS

PDF

79.3 KB Created: 2021-04-01 07:12:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: bf3f2bd7205ff10803662d1ccd15463e SHA-1: 7ad8b90bc2ed6419956d66de11a40f6e893f7ff9 SHA-256: 99bf530153decccd4fc12b81abb9ef5682bd2a00fc37783830bf05e7df83a819
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of embedded URLs, many pointing to disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The document body, though heavily obfuscated, contains references to wkhtmltopdf and Qt, indicating it was likely generated by a tool rather than a standard document editor.

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://botokaw.ru/strik?utm_term=how+do+i+clean+the+drip+pans+on+my+electric+stove PDF link annotation
    • http://bipamujiwi.iblogger.org/ielts_reading_recent_actual_test_with_answers.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368760/normal_601604a520745.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459323/normal_5ffd5cf20210f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408703/normal_605ee41d6316f.pdfIn PDF document text
    • http://bumaga.bz/rubber_sheet_manufacturers_in_gujarat9odof.pdfIn PDF document text
    • http://pinerapidsrr.com/peter_eisenman_diagram_diaries14tbw.pdfIn PDF document text
    • http://comp-arenda.site/44109918857jc8st.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4447649/normal_5ff6ae7a18e37.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380674/normal_6062e3e51cae6.pdfIn PDF document text
    • http://fesunasisodenod.getenjoyment.net/aptitude_test_questions_and_answers_for_banks.pdfIn PDF document text
    • http://topplafond.xyz/66971673758ne44r.pdfIn PDF document text
    • http://d2-club.ru/p-type_semiconductor_definition_siliconu7xhy.pdfIn PDF document text
    • http://cafechorsu.ru/who_is_sam_i_am_trying_to_get_to_eat_green_eggs_and_ham68hvy.pdfIn PDF document text
    • http://galoomer.online/7075398763lgh1o.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4479226/normal_5fdd9d6dba71e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415745/normal_604f4fb5b960c.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://woranuganavot.myartsonline.com/switching_and_finite_automata_theory_2nd_edition.pdfIn PDF document text
    • http://lubuzozerewa.rf.gd/how_to_reset_verizon_ont_battery.pdfIn PDF document text
    • http://dapekafuxururo.myartsonline.com/creative_writing_lesson_plans_for_elementary_students.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eba9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBA9 5528 bytes
SHA-256: 8fdffaabbedd00e7da3fac26d58c31f17e999646da14c3f74d76b6c1bc618bf2
font_01_sfnt_off0000fe59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE59 2980 bytes
SHA-256: c19c18cc988b52eba7a27f8e61ed40d7734616dc124310ed215fd3ee33919bb5
font_02_sfnt_off00010ae8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AE8 10660 bytes
SHA-256: 5a3c4816ca1b5212901cd049f8f97acf54cafb77cf0abc673e4067c83c7acc4d

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