Malicious PDF — malware analysis report

Static analysis result for SHA-256 851ac233acea6e81…

MALICIOUS

PDF

75.2 KB Created: 2021-03-14 03:07:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: c57576ff4b909217061351ab89fc542d SHA-1: 45b15f96a5611b37b1524057a5b9d90be641092e SHA-256: 851ac233acea6e810c7a8d0eb965591789a58426c92b054dcbf9d9ec97d3d691
126 Risk Score

Malware Insights

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

The PDF file contains multiple embedded URLs, one of which, 'https://golowaki.ru/123?utm_term=canon+printer+ip2770+installer+free', appears to be a lure for downloading a printer driver installer. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a link farm on disposable hosting, suggesting a phishing or malware distribution attempt. ClamAV detection as 'Pdf.Phishing.Trojan' further supports the malicious nature of the file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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 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://golowaki.ru/123?utm_term=canon+printer+ip2770+installer+free PDF link annotation
    • http://vbnmcxz.xyz/ielts_speaking_practice_tests_with_answersz7yzt.pdfIn PDF document text
    • https://dilomosef.weebly.com/uploads/1/3/4/3/134316650/33f6ef.pdfIn PDF document text
    • http://citimart.online/dogexedafg2lt.pdfIn PDF document text
    • http://rokamik.iblogger.org/discovery_turbo_max_tv_guide.pdfIn PDF document text
    • https://womegirig.weebly.com/uploads/1/3/4/5/134506381/77950224e0ba882.pdfIn PDF document text
    • https://kozugirufeji.weebly.com/uploads/1/3/4/8/134884007/tujisulufuwoxivofu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490274/normal_5fdc2671ecad4.pdfIn PDF document text
    • https://voduvavib.weebly.com/uploads/1/3/4/0/134096125/gijepenigujo.pdfIn PDF document text
    • http://soluzixod.66ghz.com/google_drive_sign_in_sheet_template.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368251/normal_600d793555e56.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412174/normal_601b3c09e87ad.pdfIn PDF document text
    • https://nupewaxupojiga.weebly.com/uploads/1/3/4/0/134042887/gazajomepa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483070/normal_5fd3b2c63c216.pdfIn PDF document text
    • http://getporte.xyz/repomekejunefegogadck2i.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/06508a3a-8e4a-436e-8161-354d18b93e18/45849542687.pdfIn PDF document text
    • http://mujepivetum.epizy.com/lamirivisijenevobivip.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d3f83e1e-94af-4019-bcd9-5cf858cdd72d/46622662023.pdfIn PDF document text
    • https://s3.amazonaws.com/zexozavo/buvivefida.pdfIn PDF document text
    • http://delitareba.rf.gd/libesudirafokepitigepus.pdfIn PDF document text
    • http://lubesugoninop.epizy.com/4459094373.pdfIn PDF document text
    • https://s3.amazonaws.com/nabifovu/employee_consent_form_templates.pdfIn PDF document text
    • https://s3.amazonaws.com/kizugokofo/apple_watch_faces_series_4.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_off0000e8cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8CC 5156 bytes
SHA-256: 7e4ce06e8f8c8d75a5815aef82511beeed44431951f104561fcca8728bb5327f
font_01_sfnt_off0000fa64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA64 10856 bytes
SHA-256: 92126844342a4304c86ce9e79c695f5b65386a9a4277f6fffb176fb9a94d4d87

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