Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a20fbe90729c062…

MALICIOUS

PDF

143.7 KB Created: 2021-04-02 10:09:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: 47969aaa14e4eaf1474ad128366984a0 SHA-1: 561a9f5e70f1615d5a4dabbf1168d5637e047740 SHA-256: 6a20fbe90729c062e6f176ca1376270c81dd8a21a8ea22597d43bf930c4d84c9
126 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as 'Pdf.Phishing.Trojan' and a machine learning classifier indicated a high probability of maliciousness. It contains numerous embedded URLs, with a significant heuristic firing indicating it's a link farm on disposable hosting. The document body, though heavily obfuscated, appears to contain keywords related to exercises and PDF, suggesting a lure to disguise the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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/award?keyword=ejercicios+resueltos+de+bajada+de+cargas+pdf PDF link annotation
    • http://joxixer.22web.org/weekly_academic_calendar.pdfIn PDF document text
    • https://cdn.sqhk.co/zisubiziwu/8jhjbhb/business_management_wikipedia_the_free_encyclopedia.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449614/normal_5fd2e36be0c69.pdfIn PDF document text
    • https://cdn.sqhk.co/bokirebi/IjcOhhd/jegafes.pdfIn PDF document text
    • https://cdn.sqhk.co/suzeboxiwo/oPhaqji/rewards_reading_program_lesson_plans.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414687/normal_60662990c5d63.pdfIn PDF document text
    • http://wubarikenokepi.iblogger.org/animal_worksheets.pdfIn PDF document text
    • https://cdn.sqhk.co/janimivaxo/gfI3Cjd/human_fall_flat_golf_level_ps4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370777/normal_5ff7f864cbdc2.pdfIn PDF document text
    • http://menbp.online/10862890212zn0c9.pdfIn PDF document text
    • http://genusadnlo.space/882156334136zf2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4418762/normal_5ff84552c0b2d.pdfIn PDF document text
    • https://cdn.sqhk.co/vufebevefo/TihYugj/knife_fight_sound_effects.pdfIn PDF document text
    • https://cdn.sqhk.co/mikedeto/Thagige/71146157423.pdfIn PDF document text
    • http://gutemirofexobu.iblogger.org/upper_and_lowercase_alphabet_matching_worksheets.pdfIn PDF document text
    • https://cdn.sqhk.co/vozogekom/jgiZ0je/kalilil.pdfIn PDF document text
    • https://cdn.sqhk.co/womafafowix/gfZig2X/ankylosing_spondylitis_guidelines_bsr.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/37e4f5ad-bff3-4863-8216-214e7b24c446/who_owns_raynor_garage_doors.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4dbab983-03cb-4e58-a988-94c0c2ea1733/lezunudekewituponifibu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/62b5cf34-4c75-4103-b34c-3e5e26a1f531/pinifosalukuv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5f6ac913-de69-49c2-af93-b8e45bfe4fb3/81321082930.pdfIn PDF document text
    • http://fizanotafogibag.rf.gd/g_shock_rangeman_gpr_b1000_malaysia.pdfIn PDF document text
    • http://fuvituze.epizy.com/school_admission_form_format_in_tamil.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c1194182-609b-40cd-881d-b62c36977406/how_to_write_an_introduction_for_an_observation_essay.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://www.geocities.com/mitra_anirban/hobbies.htmGNUIn PDF document text
    • http://www.gnu.org/copyleft/gpl.htmRegularIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001e5b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E5B0 5496 bytes
SHA-256: 8d6a465e28ce3d9c6dbb3ab2329553c7cd336bd346abb873c89199ce25fd17c3
font_01_sfnt_off0001f86a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F86A 3720 bytes
SHA-256: d0c9e33916e9e64e42e31bcf0d345f6c2fcd41735b1a34df0119bd0eb1094281
font_02_sfnt_off000203ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x203CE 13288 bytes
SHA-256: a8859a5b05321e1144d4f4e36648a0c91f8d75631939a8d9fad8b4a312b59cb6