Malicious PDF — malware analysis report

Static analysis result for SHA-256 c13d330c333eec18…

MALICIOUS

PDF

74.8 KB Created: 2021-04-04 21:12:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: e4525c841dd49a6acfb2474bfa26a4f9 SHA-1: 32e589c839b3bd334ad608d35604456d51c7acf3 SHA-256: c13d330c333eec189da9f1b881f57886d58cc17cb207347fa2ced303692b1e85
214 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one specifically identified as a malicious redirector. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' and the high ML score indicate malicious intent. The document body, though heavily obfuscated, contains strings related to 'bankersadda monthly pdf' and 'wkhtmltopdf', suggesting a lure for financial or academic content to mask malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/award?keyword=bankersadda+monthly+pdf In PDF document text
    • http://kobazugipodiv.medianewsonline.com/save_illustrator_smaller_size.pdfIn PDF document text
    • http://agnewjacobs.com/motogp_schedule_channelq5fyt.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369922/normal_5fdc8c05132b9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4497650/normal_6017f9f658b22.pdfIn PDF document text
    • http://hookup157.fun/8946018667ujj0d.pdfIn PDF document text
    • http://geesecam.com/396768105078tlav.pdfIn PDF document text
    • http://xutefizil.getenjoyment.net/think_central_5th_grade_math_book_answers.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4407303/normal_5fef98ae43c8e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4505839/normal_5fdc7a56e8dd2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4444643/normal_5fde7b25d664b.pdfIn PDF document text
    • http://bit7.top/kenmore_bread_machine_recipe_bookp3orw.pdfIn PDF document text
    • http://xofelivigavas.mywebcommunity.org/dafas.pdfIn PDF document text
    • http://kosonetibekub.medianewsonline.com/87861597867.pdfIn PDF document text
    • http://idealicaitaly.site/guzewefosusac3n20.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/tiluwisulepam/differential_equations_with_boundary-value_problems_8th_edition_solutions.pdfIn PDF document text
    • https://s3.amazonaws.com/wutisigila/swimming_goggle_lenses_color_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/woxojuxafopuv/macbeth_full_title.pdfIn PDF document text
    • https://d09251a9-b09e-4077-8ccb-24037f005f7b.filesusr.com/ugd/a6ce17_2b71cfbe35c6486da1d50ac1d7400855.pdf?index=trueIn PDF document text
    • https://e0bfa911-60eb-4c53-bd8d-ceec25156dfb.filesusr.com/ugd/0a052f_96a1925d4497406bb5426e0206d43d14.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/vufuzewasi/kakosag.pdfIn PDF document text
    • https://s3.amazonaws.com/simujix/rupelir.pdfIn PDF document text
    • https://s3.amazonaws.com/fotojipifuzitul/mandated_reporter_laws_ohio.pdfIn PDF document text
    • https://s3.amazonaws.com/kujapomib/35959498874.pdfIn PDF document text
    • https://s3.amazonaws.com/vokeri/10364541814.pdfIn PDF document text
    • https://s3.amazonaws.com/garorowa/t_shirt_template_free.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_off0000e698.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE698 5496 bytes
SHA-256: 27a3ca952c58666f69e6305f94d9c8b1c1a1a82596adc88bf304d97dcd608fe3
font_01_sfnt_off0000f92f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF92F 10752 bytes
SHA-256: f630226291d40585cce7bd2bc17914c1b6457aead935efd6bfb8a17fd83eb6bc

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