Malicious PDF — malware analysis report

Static analysis result for SHA-256 83ff9be17db72c06…

MALICIOUS

PDF

65.2 KB Created: 2021-02-26 00:08:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: bcf051df96ac62a97c80d8112d398b0b SHA-1: 231ed00abe7c786053b6acb637164334eedf53ed SHA-256: 83ff9be17db72c06253c7f47c1ba3882257c915945c712678d715a7046624b16
156 Risk Score

Malware Insights

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

The PDF contains a mass of external links, identified as a link farm, with one prominent URL suggesting a lure related to 'www jan brett com activities pages htm'. ClamAV and ML classifiers flagged this PDF as malicious, specifically as a phishing trojan. While no scripts were directly extracted, the PDF structure and heuristic firings indicate a malicious intent to redirect users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://druttle.ru/wix?keyword=www+jan+brett+com+activities+pages+htm PDF link annotation
    • https://safasisi.weebly.com/uploads/1/3/4/4/134472516/391825.pdfIn PDF document text
    • http://bomaduworofa.medianewsonline.com/cabelas_80-liter_commercial_food_dehydrator_reviews.pdfIn PDF document text
    • http://gagelepapu.22web.org/62190115050.pdfIn PDF document text
    • http://zewikeb.iblogger.org/dejufemikadekazu.pdfIn PDF document text
    • https://xutawolovunoka.weebly.com/uploads/1/3/0/7/130739399/tufufiguz_lujigab_rogub.pdfIn PDF document text
    • http://fisareboveda.getenjoyment.net/how_to_get_rid_of_best_friend_heart_on_snapchat.pdfIn PDF document text
    • http://pimolala.22web.org/tulip.pdfIn PDF document text
    • http://wumewil.sportsontheweb.net/how_to_install_extend_to_fit_forward_facing.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://retelowanudugut.epizy.com/35348026132.pdfIn PDF document text
    • https://s3.amazonaws.com/dupula/foguwevilasudikolevaz.pdfIn PDF document text
    • https://s3.amazonaws.com/patotale/building_works_contract_template_uk.pdfIn PDF document text
    • http://fiforeru.atwebpages.com/los_juegos_del_hambre_libro_1_paginas.pdfIn PDF document text
    • http://jisijuvod.myartsonline.com/john_deere_71_planter_history.pdfIn PDF document text
    • https://s3.amazonaws.com/wunojipu/kindergarten_teacher_cover_letter_template.pdfIn PDF document text
    • https://s3.amazonaws.com/tazopaju/aperture_priority_camera_android.pdfIn PDF document text
    • https://s3.amazonaws.com/xujitezu/23412927630.pdfIn PDF document text
    • https://s3.amazonaws.com/nazekisigiduz/why_isnt_my_scanner_scanning_the_whole_page.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c28e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC28E 5696 bytes
SHA-256: 9154287c14148076a1781bed909c430f0326c7b1300756af62029db1ea86aa6d
font_01_sfnt_off0000d5e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5E7 9892 bytes
SHA-256: 35db7345ad0fc510e46026effa46df928c513e4ecacccbfd2d57a9f68ee20620

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