Malicious PDF — malware analysis report

Static analysis result for SHA-256 3831bcde7416697f…

MALICIOUS

PDF

88.6 KB Created: 2021-02-27 11:15:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-20
MD5: 34ff91a0a1be502d9028c3747ed678ad SHA-1: 45b2af07d71b36c9014bc8b8d1516ba31c2b4569 SHA-256: 3831bcde7416697fba29e102f7b0fbfe14581f7ef565d5645b80c04390933ce5
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with one specifically pointing to 'jacksth.ru' and a query parameter suggesting a lure related to 'data mining definition in tamil'. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery. The presence of multiple disposable domains and link farm heuristics further supports a malicious campaign.

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 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://jacksth.ru/123?utm_term=data+mining+definition+in+tamil PDF link annotation
    • http://sfhgfje5df.xyz/para_q_sirve_la_vitamina_e_en_el_cabelloucn6z.pdfIn PDF document text
    • http://adv-workshop.site/691540466045uyjj.pdfIn PDF document text
    • http://mattelipsticks.site/consumer_reports_mattresses_sleep_numbermzjb6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4412757/normal_5ff4eeb01822a.pdfIn PDF document text
    • http://matteset-spon.space/976179388628swc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424951/normal_6018330db5935.pdfIn PDF document text
    • http://idealicaitalia-official.site/jawasakirinakue8cjn.pdfIn PDF document text
    • https://cdn.sqhk.co/rogudokives/ggwMjdG/my_business_venture_franchise_reviews.pdfIn PDF document text
    • https://cdn.sqhk.co/loberutebe/a7vhfji/27996037467.pdfIn PDF document text
    • http://biomaniix.website/alliant_powder_reloading_data_for_6.5_creedmoors3223.pdfIn PDF document text
    • https://cdn.sqhk.co/texekikevow/hbnieje/wajorageforarujobu.pdfIn PDF document text
    • http://ig-objectionform.com/zenetevipapajeta83gnn.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • http://bogurivesinoni.rf.gd/xarako.pdfIn PDF document text
    • https://s3.amazonaws.com/bizamesuwepe/ikea_poang_chair_manual.pdfIn PDF document text
    • http://xajokaxakubif.rf.gd/waberemeraveguwivavadagez.pdfIn PDF document text
    • https://s3.amazonaws.com/suzujewa/campbell_scientific_cr1000_data_logger_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/gateme/caracteristicas_de_los_personajes_de_la_novela_cronica_de_una_muerte_anunciada.pdfIn PDF document text
    • https://s3.amazonaws.com/sakaburepagase/fruit_cake_recipe_video.pdfIn PDF document text
    • http://zavedofidime.rf.gd/dogixawijugov.pdfIn PDF document text
    • https://s3.amazonaws.com/xijuxosisomuna/52143892280.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off0001265e.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x1265E 26628 bytes
SHA-256: 82c549714853c68063480c09855a522e39932dca7f11db075c082ecd06c8a4f9
font_00_sfnt_off0000e689.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE689 4952 bytes
SHA-256: fe531557b982fb3069644ac8c29e27d15f4e60118ffdd9b8ed19c2ae42eea03f
font_01_sfnt_off0000f75d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF75D 2308 bytes
SHA-256: bf3150ae3ab4155a537da946c997ce6752a6e8ad50f6cad4342806fe1cfe4d7e
font_02_sfnt_off00010155.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10155 10972 bytes
SHA-256: 0633602550a40e9eedbf9496f19271c43f68951dc8b48dc80a80c8ee87d20c37

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