Malicious PDF — malware analysis report

Static analysis result for SHA-256 628bc54e4d8585c3…

MALICIOUS

PDF

68.3 KB Created: 2021-02-23 10:15:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-04
MD5: edb21506a2c779bdc85fa8f580bd7c15 SHA-1: 7b6a05d64a485e0401d785ec79f70c7a79c54baa SHA-256: 628bc54e4d8585c319753650e6411d6c99037698c72493b302171844b0c86621
206 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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.
  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) or Microsoft license-boilerplate documents that carry no urgency or charge/dispute escalation.
  • 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://leonvi.ru/aws?utm_term=spypoint+camera+customer+service+phone+number PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4482631/normal_5fd3397ff27d1.pdfIn PDF document text
    • https://karezolakep.weebly.com/uploads/1/3/1/3/131398125/0ec0a45aee.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4385231/normal_600653d3d658e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456165/normal_5fdab6e0c6095.pdfIn PDF document text
    • https://pesiwuveso.weebly.com/uploads/1/3/5/3/135392822/folag_suzukeguxeku_movesajapewurux.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459939/normal_601ee5ecd2403.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4423133/normal_5fd16f4ad9d08.pdfIn PDF document text
    • https://zovezeko.weebly.com/uploads/1/3/4/6/134697242/xadir.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421624/normal_5ffca4281bb27.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4402722/normal_5feb6c241a553.pdfIn PDF document text
    • https://wabalolosezuluf.weebly.com/uploads/1/3/4/4/134462862/035efa.pdfIn PDF document text
    • https://kakituku.weebly.com/uploads/1/3/4/5/134589995/gipetetojeg-zoxone-bosofonitaxu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475720/normal_6017366b9d0f9.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zaxawewobarus.epizy.com/sony_headphones_wh-1000xm2_review.pdfIn PDF document text
    • http://xizefuta.rf.gd/maths_gcse_edexcel_2019_paper_3_answers.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_off0000ce22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE22 5548 bytes
SHA-256: bbb0433a395d093147bd7ffed026f72bb4633cbea9c5ba86e1e3fd8f6d167215
font_01_sfnt_off0000e0e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0E1 10284 bytes
SHA-256: bb5f98e84d95cb6bfcc482c255d848dfe87e03031f4b67ff5a970b56c1fa4518

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