Malicious PDF — malware analysis report

Static analysis result for SHA-256 597b11b6055a0046…

MALICIOUS

PDF

89.0 KB Created: 2021-03-10 05:43:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: 99576a3f265bb06aa113d1309ef56f8e SHA-1: eac91d3e3801a4439ff10fce95ce045355c3c59d SHA-256: 597b11b6055a00466bbca14ec5ed1f9d9e2967fe10f026366e855368b9c155b0
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with a critical heuristic flagging it as a 'PDF_SEO_LINK_FARM'. One of the primary external URIs points to 'https://pelibifir.ru/wix?keyword=2013+isuzu+npr+hd+owners+manual', suggesting a potential phishing or SEO spamming lure. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution.

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://pelibifir.ru/wix?keyword=2013+isuzu+npr+hd+owners+manual PDF link annotation
    • https://zuzesewijolane.weebly.com/uploads/1/3/1/4/131406438/bitar-tomilefifarifij.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496582/normal_5fd316039995b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417046/normal_5fe60bf9d8f85.pdfIn PDF document text
    • https://lemuwepino.weebly.com/uploads/1/3/2/7/132712354/rotevitazi.pdfIn PDF document text
    • https://rozinezo.weebly.com/uploads/1/3/1/6/131636990/regolofobata.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4503524/normal_5ff630772e234.pdfIn PDF document text
    • https://jevavuxenexek.weebly.com/uploads/1/3/5/3/135351486/35e9d6b7dc59d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/f4275ba0-7dae-455f-9a6a-852e43049ad2/munegisosatezoxifufupi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/23cc82c6-e273-470e-ac6e-58b5a22a712c/25928424674.pdfIn PDF document text
    • https://s3.amazonaws.com/dorobukasawituw/pantech_breeze_iii_pc_suite_download.pdfIn PDF document text
    • https://s3.amazonaws.com/nosepevozux/87487573817.pdfIn PDF document text
    • https://s3.amazonaws.com/tamobalasu/personal_management_merit_badge_workbook_2018.pdfIn PDF document text
    • https://s3.amazonaws.com/rerinago/buroximubaruz.pdfIn PDF document text
    • https://s3.amazonaws.com/kizugokofo/zaxuzenezotopetexosuga.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/221d0be0-ea0c-4d66-b675-ee8c02c2c46e/online_demat_account_opening_siddhartha_capital.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1d3bbd5d-7b76-4f94-b8c5-2b89842141fc/nateputuxofupisox.pdfIn PDF document text
    • https://s3.amazonaws.com/nilafafakem/vefilokonigi.pdfIn PDF document text
    • https://s3.amazonaws.com/sifawekujiki/activity_based_costing_chapter.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b30a74e8-d1c2-4af4-9f56-6c009e0105b1/55023413171.pdfIn PDF document text
    • https://s3.amazonaws.com/zumezeviwakiz/nimesumowonuririmu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3c19f1b9-b385-474d-8f75-7d29d2b06a6c/python_write_string_variable_to_text_file.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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000105cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105CF 5536 bytes
SHA-256: 6f6a5a88b72b413a58fcaa182135e08a1133dca542b078a144b15576d44c3deb
font_01_sfnt_off00011872.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11872 15652 bytes
SHA-256: 58793937f036fdc80d57ad28e31698a91876e68cdfb6feae3bafa0084e645cb0
font_02_sfnt_off000148ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x148CE 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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