Malicious PDF — malware analysis report

Static analysis result for SHA-256 b235e819e86363cb…

MALICIOUS

PDF

90.3 KB Created: 2021-03-18 20:13:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 93d04d78707ecd96e5cbda56560757ac SHA-1: 9a2f43c3f77bb7d8f36ba5d4c12e81bfee2fb5d6 SHA-256: b235e819e86363cb8bc44ac6f27e573187db4b5a5cfe6bbe50575504d867b5a3
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://seumenha.ru/wix?keyword=danielle+pierce+reviews PDF link annotation
    • http://nunovoxiwanafuz.getenjoyment.net/background_color_jspdf.pdfIn PDF document text
    • https://votarozoxanobo.weebly.com/uploads/1/3/4/3/134315144/b2c5da07422.pdfIn PDF document text
    • http://hallop.xyz/what_are_some_examples_of_toxic_wastep7gzy.pdfIn PDF document text
    • https://bedejoxinen.weebly.com/uploads/1/3/1/1/131163540/3246558.pdfIn PDF document text
    • http://belldiscount.ru/cette_exprience_ma_permise_ou_permis62eo9.pdfIn PDF document text
    • https://wurilulisewanid.weebly.com/uploads/1/3/4/7/134728532/bisapudapokew.pdfIn PDF document text
    • https://mezikemopirexat.weebly.com/uploads/1/3/5/9/135993778/8699984.pdfIn PDF document text
    • https://zelowomuguzak.weebly.com/uploads/1/3/1/3/131379017/fc8e6ffe124.pdfIn PDF document text
    • http://lizowaw.scienceontheweb.net/68406846748.pdfIn PDF document text
    • http://rollernefrit.xyz/project_task_list_template_excel_free_downloadjn7w4.pdfIn PDF document text
    • http://tedurelaseji.mygamesonline.org/savuribumuromet.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/546dbd24-c61e-474e-95dc-612e73e6f51e/48409459783.pdfIn PDF document text
    • https://s3.amazonaws.com/wizakokowe/14350375828.pdfIn PDF document text
    • https://s3.amazonaws.com/dazemi/medicare_enrollment_form_working_holiday_visa.pdfIn PDF document text
    • https://s3.amazonaws.com/xufujofaleki/hyperoptic_router_user_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9ee3b194-1b2b-4f9a-a324-a6c2d9300d91/how_to_do_an_interview_article.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4f244cbb-feee-4b59-81b8-01706b0cb1ed/city_of_bones_michael_connelly_plot.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3a2824c8-aef8-4eab-a5c2-a9391073bc45/puxobarobumixez.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5a824a9d-4df0-4787-888d-b79959edb05b/sat_math_section.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e1f5f75e-d06f-4b52-baf9-c0866cd50bb7/why_was_sonny_killed_in_the_godfather.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e1cd8c65-0e5f-43f1-8d11-d2726dfc4bd5/70540255254.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f6668dd1-37cd-4566-8b8e-d1341f3441bd/verekujunomilewulepogomik.pdfIn PDF document text
    • https://s3.amazonaws.com/xeruxaxer/academic_cv_latex_template_economics.pdfIn PDF document text
    • https://s3.amazonaws.com/zodawanuror/26895541197.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_off00012471.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12471 5080 bytes
SHA-256: 004142c40a24bea714ee551ff0db9abde911b5814090232646edb342b265c3c2
font_01_sfnt_off000135e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135E7 11284 bytes
SHA-256: c6ad6dd94b124c64e8b0047c1fb6563b44837f36502bba6bb05456a99f7b7420