Malicious PDF — malware analysis report

Static analysis result for SHA-256 66b2ad4867b59345…

MALICIOUS

PDF

67.9 KB Created: 2021-01-17 11:39:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 39acc6aea44ec15e186c097eb61ccf12 SHA-1: 8c4661f32c42a2ccf426d36e5ef71162237f2885 SHA-256: 66b2ad4867b5934522e6ed23dcda91b567e2c4153deeef22827dbf5948600f0b
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains a large number of external links, many of which are disguised as search results or resources, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were directly extracted, the PDF structure and numerous external links point towards an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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://trafffi.ru/123?utm_term=roblox+group+with+no+owner+and+funds+finder PDF link annotation
    • https://cdn.sqhk.co/bogulevim/8jabDjj/m._u._d_rally_racing_mod_apk_download.pdfIn PDF document text
    • https://cdn.sqhk.co/pimidima/ogiUhgp/vitowekododexupolavet.pdfIn PDF document text
    • https://cdn.sqhk.co/xidupesijij/hijhguJ/photo_editing_software_free_download_full_version.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393488/normal_5ff5f65f6d2ad.pdfIn PDF document text
    • https://cdn.sqhk.co/takejirasomu/jhihcxD/football_manager_2020_touch_nintendo_switch_review.pdfIn PDF document text
    • https://goxanakevixi.weebly.com/uploads/1/3/4/8/134857001/kenoxarunereroraku.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408170/normal_5fa910a8ba303.pdfIn PDF document text
    • https://cdn.sqhk.co/wuzutuse/k4SghhH/57753709632.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403274/normal_5fe25201c6a55.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/rupatojuko/95741506224.pdfIn PDF document text
    • https://s3.amazonaws.com/kavalukato/pasibuvelixokowozix.pdfIn PDF document text
    • http://lenixad.epizy.com/fractured_minds_ps4_trophy_guide.pdfIn PDF document text
    • http://fuxufotab.epizy.com/resume_for_teacher_job_application_format.pdfIn PDF document text
    • https://s3.amazonaws.com/nitidadufetenu/bloons_tower_defence_3.pdfIn PDF document text
    • http://wojuzixe.epizy.com/vidyalankar_school_of_information_technology_erp_login.pdfIn PDF document text
    • https://s3.amazonaws.com/mubemutolewe/event_planning_website_template_wordpress.pdfIn PDF document text
    • https://s3.amazonaws.com/tigewibejageju/nutritional_information_of_homemade_almond_milk.pdfIn PDF document text
    • https://s3.amazonaws.com/fuwenoxuzasila/5111281057.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_off0000cc4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC4B 5612 bytes
SHA-256: 21d16bd57c7daa001d50fb926ec5ec66ea26169d2c2b026fe342287a82e518b6
font_01_sfnt_off0000df79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF79 10224 bytes
SHA-256: 435f1c6a7c0c3e3746b2ad610bb205f2bdedac1268a98adf615d831205e9a789

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