Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7d15fd6ed056cf3…

MALICIOUS

PDF

76.1 KB Created: 2021-05-13 22:03:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 63a63b98a45ce1d912989873022ae019 SHA-1: d306cfe6869ed04f4c67db54442d2a25c271ebbc SHA-256: b7d15fd6ed056cf3e5c14d5c01b8349f6dbf1e5a33c4e295205fc190917791f8
186 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO poisoning tactic to direct users to malicious content. The presence of embedded URLs and the overall structure strongly indicate an attempt to trick users into visiting potentially harmful sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://vilenefex.ru/strik?utm_term=how+much+does+a+plastic+bag+weigh PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4459185/normal_601ad79c92984.pdfIn PDF document text
    • https://barurusijibipek.weebly.com/uploads/1/3/0/7/130740419/6126503.pdfIn PDF document text
    • https://mugevodotigo.weebly.com/uploads/1/3/0/7/130740084/vewukexizupevunenu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463788/normal_6031e74e052cc.pdfIn PDF document text
    • http://gebuhrenfrei-mein.com/how_to_read_book_on_audiblehll2h.pdfIn PDF document text
    • https://cdn.sqhk.co/vujagefamig/jhjwl20/37017022645.pdfIn PDF document text
    • https://cdn.sqhk.co/bugininaxi/agdvgfk/xoxuwisiworanuze.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452835/normal_606407b05fa6c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408865/normal_5fdc65983e814.pdfIn PDF document text
    • https://dalupapixoriwu.weebly.com/uploads/1/3/1/4/131438121/ed971572880278a.pdfIn PDF document text
    • https://jetorijeroxu.weebly.com/uploads/1/3/4/6/134693882/4301849.pdfIn PDF document text
    • http://lightstart.xyz/ti_34_multiview_calculator_onlinea7wgs.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456140/normal_605c76a63b736.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://resaralamefevep.epizy.com/argiope_argentata.pdfIn PDF document text
    • https://2791e1c6-719d-47aa-bdc5-1556df251b63.filesusr.com/ugd/7757c5_fdb68c9952ac4bcdace85e0bbb6e550c.pdf?index=trueIn PDF document text
    • https://26c1613e-5d28-4fa3-89cb-3d2c9ab59faf.filesusr.com/ugd/fe83c3_52ee89c6c2c84e14ad50d50ef010dd2f.pdf?index=trueIn PDF document text
    • https://e1318bff-d970-45e2-bcea-45481503a18b.filesusr.com/ugd/75a96d_c0be1b424a6f4beaa7eeb93b1567838e.pdf?index=trueIn PDF document text
    • https://60ceb029-6f78-4d42-8ea4-15ca08d8077a.filesusr.com/ugd/857e61_7f2f2782bf204f1fb2b457ca9675b016.pdf?index=trueIn PDF document text
    • http://xafaxeko.epizy.com/passive_voice_vs_active_voice_worksheet.pdfIn PDF document text
    • https://557345b1-98c6-442d-b460-9e357c178e5b.filesusr.com/ugd/dfb5f8_0fde176bbe3446978535f0a501eb268a.pdf?index=trueIn 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_off0000ebdb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBDB 5584 bytes
SHA-256: e18af2380218cd550619ed4d4fb8001c49a08643bfe44cbfb0f8f5eedd87a53b
font_01_sfnt_off0000febd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEBD 10640 bytes
SHA-256: 42203fa3459f7a131b242ed26d1d0f78b5627af48799b387e349c5531b5e1fcf