Malicious PDF — malware analysis report

Static analysis result for SHA-256 5bb9fa8da2548140…

MALICIOUS

PDF

80.2 KB Created: 2021-03-28 18:50:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: dca9bc0122a3a9cac6221c874dc62a78 SHA-1: 1dc742db478f084d689e3257e1713fb7bde394f9 SHA-256: 5bb9fa8da25481408e5c291851867119be39996528fc6c874371f548e2e091d5
126 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with one specifically pointing to a domain that appears to be a link farm designed to redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. No scripts were extracted, but the presence of numerous external links suggests an attempt to redirect the user to a compromised or malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://maypoin.ru/award?keyword=chemical+reactions+in+daily+life+pdf PDF link annotation
    • https://cdn.sqhk.co/xasexuwosul/gc62ihN/voice_changer_cracked_apk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456998/normal_603e0ea0e9420.pdfIn PDF document text
    • https://cdn.sqhk.co/letarezetap/CqLhfN7/localizar_mi_android_por_gps.pdfIn PDF document text
    • https://cdn.sqhk.co/repipedifavi/MhgeDH5/wujadotix.pdfIn PDF document text
    • http://lololoj.sportsontheweb.net/57770848181.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371783/normal_6057a164ec904.pdfIn PDF document text
    • http://huseyincanx.com/zalidorewajovapojomi6r98r.pdfIn PDF document text
    • https://cdn.sqhk.co/kuzetuzame/Ngjfjj6/21822588217.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489733/normal_5feb0e7279cb3.pdfIn PDF document text
    • http://woziwowariv.sportsontheweb.net/55398335624.pdfIn PDF document text
    • https://cdn.sqhk.co/pojimisuso/gjiLJjh/defuse_different_joker_bombs_fortnite.pdfIn PDF document text
    • http://tamakedesununod.mywebcommunity.org/it_project_manager_interview_questions_and_answers.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467277/normal_60252fdf8e6fa.pdfIn PDF document text
    • http://reawont.online/tosezurezufebedezapit3qjn1.pdfIn PDF document text
    • http://my-favshopd.online/56991110241ws67f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460243/normal_60334fce6fcea.pdfIn PDF document text
    • http://chategratis.online/delta_bentley_crib_to_toddler_bed1fuj3.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/5f6e57f4-d3d3-43a9-a1c4-8dcfdf14aa49/18143498627.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/db49ca8c-addc-4188-a1cf-36f739076f11/starbucks_cold_drink_cups_with_straw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/479c3bd5-73df-436d-818e-337a985a7759/data_structures_and_algorithms_in_java_solution_manual_goodrich.pdfIn PDF document text
    • https://73a1781f-5c9f-4c76-8a11-a8e8c44f336a.filesusr.com/ugd/d9f7b5_3ae3eedffb1141f5bec817118ebd0297.pdf?index=trueIn PDF document text
    • https://99442e0c-e188-470f-b1e9-a2082f9e7f28.filesusr.com/ugd/2274a7_486e970d9030483294dfc63334eadefa.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/5143898f-7d9e-4e7f-acd3-8b6192f7ad71/does_penelope_die_in_the_odyssey.pdfIn PDF document text
    • https://5e9c932d-19a8-4d5a-a970-d4bc0bcb832b.filesusr.com/ugd/bae0a0_c1099f8dba1a441cb0d80989e35fdcc4.pdf?index=trueIn PDF document text
    • https://8d90b851-447f-4cfc-ac95-1e867b71b983.filesusr.com/ugd/b371d9_b7f2942179fc4d2bbbfd41c54a7430e8.pdf?index=trueIn 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_off0000fc82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC82 5404 bytes
SHA-256: ef8b285b0e36c635b4a9b10d0199552e109b71323f5e8f0f82d1470322597242
font_01_sfnt_off00010eb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EB8 10624 bytes
SHA-256: 4fbe5d6f2681e35739d7921f61f7590363cb134e396c462a748fb9560843978d