Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b8a92c5a1c46bb0…

MALICIOUS

PDF

73.2 KB Created: 2021-03-29 09:52:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 360d77ce4db20bc22b4d87017edef985 SHA-1: 06dc65473ed32733c2ebb11ee91135d1fe83d4c2 SHA-256: 2b8a92c5a1c46bb0d2654b8b90b79e04cdadd6a78b9cb6c092ccfb1327ace233
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with one heuristic specifically identifying a 'link farm' designed for SEO manipulation. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or directing users to further malicious content. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's used to drive traffic to potentially harmful websites.

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://vilenefex.ru/wix?keyword=whirlpool+wtw5000dw1+parts+manual PDF link annotation
    • http://gavefunene.22web.org/list_of_saturated_and_unsaturated_fatty_acids.pdfIn PDF document text
    • http://jopekeniwuvino.iblogger.org/beauty_and_the_beast_screenplay.pdfIn PDF document text
    • http://xexewolos.iblogger.org/deep_learning_ian_goodfellow_download_free.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/d17ce604-cead-4250-8104-7ff6358a740e/does_a_plasma_tv_use_more_electricity_than_an_led.pdfIn PDF document text
    • https://s3.amazonaws.com/zonivezada/palliative_care_coding_guidelines_2019.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dfcd51dd-ffe4-45ff-959f-11c92b78efc9/strength_in_what_remains_poem.pdfIn PDF document text
    • https://s3.amazonaws.com/jexijer/molexaxadejapijefabofel.pdfIn PDF document text
    • https://s3.amazonaws.com/lorifumofelu/patunopabesat.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e48e68f7-95ca-486a-9664-f8c33f2988a7/solving_rational_equations_worksheet_with_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ee99a90f-ba02-4efd-b51c-d3e5e96e1765/wapunutevirizisone.pdfIn PDF document text
    • https://s3.amazonaws.com/zowibatev/python_3._6_string_format_example.pdfIn PDF document text
    • https://13cfbe10-32e4-4d7a-9072-8dbd3280e6b8.filesusr.com/ugd/994e9e_7620a03f12c84e4fa8d6b5cc7733be52.pdf?index=trueIn PDF document text
    • https://c7bff75e-0a19-4817-9d47-fca4cf08161b.filesusr.com/ugd/3b6424_8410d462b34d479ebfe08f0e19ddfb97.pdf?index=trueIn PDF document text
    • https://2f60c0de-bae8-48d8-8f3f-ce7907f87c52.filesusr.com/ugd/badafb_4b0c2b6ee2e0413c8dfa18bbba7e1233.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tutapaxi/jufikagudadiwawemopajevow.pdfIn PDF document text
    • http://kijekamazeju.epizy.com/adineue_pro_light_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_off0000df70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF70 5624 bytes
SHA-256: 8a4773079e2e2d1bb7b43b400af1af53b6059d081cd8925d10373200efe5ed68
font_01_sfnt_off0000f280.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF280 10468 bytes
SHA-256: 2cc14b1f139a0731e28b297162fb6112da5818785cc4988a8367fe4c66a60c97

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