Malicious PDF — malware analysis report

Static analysis result for SHA-256 b2bae7bbb95f9439…

MALICIOUS

PDF

103.3 KB Created: 2021-03-20 23:48:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 2bcca5b3a624758fa44d1be818a20c06 SHA-1: 5ae072779ee50d95cf8fa7b38af6ee0098cfc16a SHA-256: b2bae7bbb95f943932a7b1afa824ed0d21a6b2e01cd7411f68193e9eb5ec6efa
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded URLs, many hosted on disposable domains, indicating a link farm designed to redirect users to potentially malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were directly extracted, the PDF structure and URL patterns are consistent with techniques used to deliver second-stage payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://kuzutuzo.ru/strik?utm_term=best+ability+for+galarian+rapidash PDF link annotation
    • http://rifajobabinafe.22web.org/pupenaturorexofelon.pdfIn PDF document text
    • http://buviturowugigew.66ghz.com/86595668490.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477156/normal_5fd27274ec3c2.pdfIn PDF document text
    • http://movoxazukum.22web.org/geometry_shapes_patterns_and_designs.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484364/normal_601068ef2213b.pdfIn PDF document text
    • http://webdefilmizle.com/john_deere_tractor_excavator_attachmentqxvli.pdfIn PDF document text
    • http://ekzo-fruit.ru/63964137955uo8lo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4407996/normal_5fe33ecbc0793.pdfIn PDF document text
    • http://robolab.one/how_to_consolidate_data_in_excel_sheetvgdmm.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420775/normal_602afe17d58e5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4475863/normal_5fcf01ac8cd0a.pdfIn PDF document text
    • http://abanca-electronica.com/781711893802pknr.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422637/normal_600bfcd6760da.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373508/normal_60346e207911a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://janalusexisowa.epizy.com/41448454536.pdfIn PDF document text
    • https://e6f9d1db-9bad-45ba-a188-0e8e378e8087.filesusr.com/ugd/99b222_7132d2ca4681431d8b752b2fb3a518eb.pdf?index=trueIn PDF document text
    • http://jolozil.rf.gd/21_day_weight_loss_challenge_india.pdfIn PDF document text
    • https://b8f7bc2e-5f90-466c-a76c-b8215bfdb3ae.filesusr.com/ugd/9717d9_4ca1e4e92d7a4717b02d49be637b2b70.pdf?index=trueIn PDF document text
    • http://vanifiwavubas.epizy.com/85237405762.pdfIn PDF document text
    • http://fadadopotonu.epizy.com/dunidovedovuri.pdfIn PDF document text
    • https://53ebb62d-ddaf-432f-8dc3-1f4746653467.filesusr.com/ugd/bbd3cf_ede03987660b4c1ca2e49565b7ac6a2b.pdf?index=trueIn PDF document text
    • https://7915398d-c9c2-4241-abdb-40cf742e4b8d.filesusr.com/ugd/d4df0f_50629f5df87843b7a293fb74a57462ec.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fdf8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDF8 25424 bytes
SHA-256: a1370cd743abedb07c498144b016539deef720be611a9054461d2cc7af3f5755
font_01_sfnt_off00014c39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14C39 5592 bytes
SHA-256: 5e164e7d5d79378a54557d75a05ffae38abc7488aec105ad4df1984cff6ef560
font_02_sfnt_off00015f3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15F3A 15432 bytes
SHA-256: 3f078324c13dad40c7a139e8dcdca674a23fc388fdd2f549a53a880e1985bcdf

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