Malicious PDF — malware analysis report

Static analysis result for SHA-256 09818281744d0aa4…

MALICIOUS

PDF

70.9 KB Created: 2021-02-08 08:36:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: 51fe509d0231cd018489ca2e819bad07 SHA-1: 32ba8eb990600ce7d9564af1b0bdc94235c00e2f SHA-256: 09818281744d0aa47623b821b5a1ee1f55d4b54090675546884ae11ac637055d
126 Risk Score

Malware Insights

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

The sample was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan' and an ML classifier indicating maliciousness. It contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm or phishing lure. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a deliberate attempt to obscure the malicious intent through a large number of links on potentially untrusted hosting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://seumenha.ru/aws?utm_term=corporate+upbeat+music+free PDF link annotation
    • http://cg-designer.xyz/electrical_load_calculation_worksheet_templateftmhb.pdfIn PDF document text
    • https://cdn.sqhk.co/fapewejav/iahj8ig/makejuvufogipepobo.pdfIn PDF document text
    • http://zotusomadelisok.22web.org/common_interview_questions_with_answers_for_freshers.pdfIn PDF document text
    • http://goldotzyv.ru/towimepxtosu.pdfIn PDF document text
    • http://yogistika.space/fuzivuraihn7.pdfIn PDF document text
    • http://znalomstvavip.site/different_types_of_wood_corner_joints0ho3h.pdfIn PDF document text
    • https://cdn.sqhk.co/tinolaseja/dbVDche/73753896808.pdfIn PDF document text
    • http://storeyou.store/acer_aahd3-vc_motherboard_manualvgro6.pdfIn PDF document text
    • http://6gusevshop.space/12659145570nnxtv.pdfIn PDF document text
    • https://cdn.sqhk.co/xolovagi/NkNcgjm/81522382069.pdfIn PDF document text
    • http://aicberg.net/989164428288j47o.pdfIn PDF document text
    • http://forpost-electrica.ru/201462551255go92.pdfIn PDF document text
    • http://jikalananigopun.iblogger.org/bralette_pattern_free.pdfIn PDF document text
    • http://rujawobezixevib.iblogger.org/game_god_of_war_android_mod_apk.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://milodip.epizy.com/75402617761.pdfIn PDF document text
    • http://xatoveg.epizy.com/all_forms_of_energy_can_do_work.pdfIn PDF document text
    • http://sisuraregimu.rf.gd/how_to_use_love_alarm_app_android.pdfIn PDF document text
    • http://wixulolefafela.rf.gd/wikebokivokol.pdfIn PDF document text
    • https://s3.amazonaws.com/sevoga/achilles_tendon_rupture_exercises.pdfIn PDF document text
    • https://s3.amazonaws.com/napejaxosinages/bridge_builder_free_full_game.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c47b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC47B 5172 bytes
SHA-256: 0aa747844ee026467788fda366bd9fec0745a1614a4c97985fd0d2ecc224da8f
font_01_sfnt_off0000d5f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5F4 10140 bytes
SHA-256: 4bf5e91b64d26625fe76df5f6fa3eb812f49bacb7d371ebce888d2d4b24bcf30
font_02_sfnt_off0000f8c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8C8 16092 bytes
SHA-256: 39b2f4b99ee08965fd4836f89f628a00cde8346cb181131bba0308e80db8fb67

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