Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5a0645fa31e3de3…

MALICIOUS

PDF

79.1 KB Created: 2021-03-28 12:10:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 74dda9831f7ce77b79efca36fb85cb4b SHA-1: 1b090c087039199081e3b1185130a5bfd60d3daa SHA-256: b5a0645fa31e3de3d7bc0088ac3ae0507239aad1e5445c1e4d96fc26e0698323
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, a technique often used for SEO manipulation or to redirect users to malicious sites. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as Pdf.Phishing.Trojan. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic confirm the attack pattern of linking to external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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+to+use+secure+denture+adhesive PDF link annotation
    • http://voztrans.ru/rajosekityg1j.pdfIn PDF document text
    • http://cryogen.me/startup_business_plan_examples_imagesnw76m.pdfIn PDF document text
    • http://padlamadla.site/rekavidoxesoxotamavebesav094j.pdfIn PDF document text
    • http://arnautmebel.ru/how_do_i_use_my_verizon_jetpack_4g_lteey5wg.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4381532/normal_6005557b52c60.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4445320/normal_5ff3ec631d91a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448720/normal_605a192c0f070.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454562/normal_5ff8c35b75649.pdfIn PDF document text
    • http://astropsychology.site/numodabiv9an30.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/vuliwisuwig/garanavaponupitalepem.pdfIn PDF document text
    • https://3789e5f8-265e-48cd-8836-241a044b7ceb.filesusr.com/ugd/45ef7e_f22c3f26c7814ff791d62ffca60315e5.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zeworibuzoza/sample_divorce_answer_and_counterclaim.pdfIn PDF document text
    • https://s3.amazonaws.com/jokotaziweluge/mathematical_logic_stephen_cole_kleene.pdfIn PDF document text
    • https://s3.amazonaws.com/fosagoba/analytical_reasoning_tips.pdfIn PDF document text
    • https://s3.amazonaws.com/fowikorejodi/what_is_the_best_small_business_telephone_system.pdfIn PDF document text
    • https://s3.amazonaws.com/zewimu/consort_guidelines_for_cohort_studies.pdfIn PDF document text
    • https://dc273c12-e125-4738-b2e6-b96bc4bd5eb7.filesusr.com/ugd/c8df25_74b74037ef034ba2b6bad4d864e0995c.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/midipes/4414089606.pdfIn PDF document text
    • https://s3.amazonaws.com/lixuduwonifa/nibukubekesefa.pdfIn PDF document text
    • https://s3.amazonaws.com/pajukovuxetu/warlock_guide_5e_2019.pdfIn PDF document text
    • https://584abdf6-e408-48d3-a53c-4313a8f82471.filesusr.com/ugd/18ee90_a82b3682b8144ce59a6c4a5d904483c0.pdf?index=trueIn PDF document text
    • https://76f5a3e5-08d8-4581-9975-6c1b933a1845.filesusr.com/ugd/dbbd16_372308a147cb41b6932c271c69b3a3e3.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_off0000f937.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF937 5108 bytes
SHA-256: cc54e4af57f7abd6e3820f5ec1bf464aabe8c43bff9c2f08501a30d254ebdafb
font_01_sfnt_off00010aa7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AA7 10532 bytes
SHA-256: 766827fb43d481bcf062d6416e20c95c80397bb144a01f8898c01028ac0fcb69

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