Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b9e3f648e2b228b…

MALICIOUS

PDF

94.5 KB Created: 2021-04-18 10:48:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 9c5fa468aef9c7b6e302b481768ef796 SHA-1: 76c8e28d5a012967330f9b4fc97366dc3e281332 SHA-256: 4b9e3f648e2b228b6c8ea62b5d6f62188333b64c71b88abb986434d0b85db10f
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with one identified as a potential phishing lure. The ML classifier and ClamAV detection strongly indicate maliciousness. The presence of embedded JavaScript, though not fully detailed, suggests an attempt to execute malicious code or redirect the user to a compromised site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://maypoin.ru/strik?utm_term=tamiya+super+blackfoot+manual PDF link annotation
    • http://wiwexar.22web.org/ap_world_history_study_guide_unit_1.pdfIn PDF document text
    • https://tulopesonu.weebly.com/uploads/1/3/5/3/135318186/fifal.pdfIn PDF document text
    • https://cdn.sqhk.co/mivufarowiwi/otNhchc/cambiar_ip_android_para_otro_pais.pdfIn PDF document text
    • http://vewikimeno.22web.org/10th_class_biology_book_english_medium.pdfIn PDF document text
    • https://cdn.sqhk.co/xubulozirod/hh4pbjc/35913602575.pdfIn PDF document text
    • https://ferakatetimof.weebly.com/uploads/1/3/4/4/134470639/4e0f181f26a.pdfIn PDF document text
    • https://poxejiwexoji.weebly.com/uploads/1/3/4/6/134639112/dd255648a795de.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/ronatiduzoxij/alcatel_lucent_4035_user_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/wuvepilamamuse/armchair_shaped_glacial_landform.pdfIn PDF document text
    • https://s3.amazonaws.com/wexoteluwag/30013652202.pdfIn PDF document text
    • https://s3.amazonaws.com/setigafat/brown_vs_board_of_education_us_history_definition.pdfIn PDF document text
    • https://s3.amazonaws.com/wiwamoxamo/learn_portuguese_language.pdfIn PDF document text
    • http://paviremepofuvu.epizy.com/wobamobefodosebefibe.pdfIn PDF document text
    • https://s3.amazonaws.com/mutirexa/jatagozosifogilanurogapu.pdfIn PDF document text
    • http://fewuzidiko.rf.gd/89479858772.pdfIn PDF document text
    • https://s3.amazonaws.com/xomepixo/spectrum_cable_tv_guide_charlotte_nc.pdfIn PDF document text
    • http://bunakakivukutus.epizy.com/35436524767.pdfIn PDF document text
    • https://3d6da986-5be3-4955-9d5c-e891e6c56a45.filesusr.com/ugd/3c671a_8ff8f0851d08478fb0cb533f3d410259.pdf?index=trueIn PDF document text
    • https://6ec3981f-6443-463b-a164-91fc69f101d9.filesusr.com/ugd/7603ae_17aeeca41ea241edb6c17d14042d06ef.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/nafoxuda/75431886636.pdfIn PDF document text
    • https://80172413-d145-4b71-b7cf-4a007d76ad29.filesusr.com/ugd/cacfd7_ac5e50de72e44ffabebd6e29a9bec8a2.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_off0001305a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1305A 5416 bytes
SHA-256: 1b44769b56e547460da70cfd6e2323793c8364e6539d99d1bc2bd753f3c13c41
font_01_sfnt_off000142bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x142BC 12644 bytes
SHA-256: ca0a436b9277874dd9a322f5c4a9c2f6799079e56927f6a38a8903e4593ee339

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