Malicious PDF — malware analysis report

Static analysis result for SHA-256 68509971a9ea4f8c…

MALICIOUS

PDF

89.1 KB Created: 2021-03-09 07:44:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 6a76636712e550bd1401a124343c67d1 SHA-1: cac2d160ef1c572298378576e4ec7a2760bca298 SHA-256: 68509971a9ea4f8c9cf010c622a48d84b38d3935610ccd96458c96b4ea8693f1
184 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with at least one pointing to known malicious redirector infrastructure. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a link farm on disposable hosting, suggesting a phishing or scam attempt. While no scripts were extracted, the presence of numerous links and the ML classifier's high confidence score strongly suggest a malicious intent to redirect users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://crophysi.ru/award?keyword=a+level+biology+carbohydrates+pdf In PDF document text
    • http://asia.kiwi/95155455623prukj.pdfIn PDF document text
    • http://cookwellbakewell.com/ridozalumay8m.pdfIn PDF document text
    • http://autokenn.com/vunitidixosoxijebuketemawjj7n.pdfIn PDF document text
    • http://brumbum2.xyz/pidebubupubazacjbja.pdfIn PDF document text
    • http://bixorusinalabi.22web.org/80189115045.pdfIn PDF document text
    • http://xesabuzusoneb.66ghz.com/anglicanism_questions_and_answers.pdfIn PDF document text
    • http://xakutovudo.iblogger.org/simizukodag.pdfIn PDF document text
    • http://fortuneo.biz/voxanekavazogau14be.pdfIn PDF document text
    • http://fontawesome.iohttp://fontawesome.io/license/In PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/48f0dee6-33b1-4642-a7a9-2984eef43d14/lazarillo_de_tormes_castellano_actual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ee98d945-4f87-493f-84ac-7142b807d28d/83279346729.pdfIn PDF document text
    • http://konevimojo.epizy.com/noxapowudivekil.pdfIn PDF document text
    • http://xaligapuk.epizy.com/jirebadopap.pdfIn PDF document text
    • http://vomifavub.epizy.com/formation_windev_mobile.pdfIn PDF document text
    • http://lugirike.epizy.com/musescore_lead_sheet_tutorial.pdfIn PDF document text
    • http://wuxodiza.epizy.com/11957812127.pdfIn PDF document text
    • http://kovaverivuv.epizy.com/67942283751.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3087a55b-03d9-4e54-8d47-8b5f5b0b9448/rifexakudegizuzakemog.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/512da0fa-9e7c-420d-a09f-9b5f21645eb3/sears_water_softener_installation.pdfIn PDF document text
    • http://lofuwokapowudug.rf.gd/matlab_drive_online_login.pdfIn PDF document text
    • http://monimupanib.epizy.com/maths_addition_and_subtraction_worksheets_year_4.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/23998abd-cebc-4ac7-91b5-3e354261b610/resuxowowuvufanifakaj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3ba443ad-3d3b-41be-babf-f35719eafe28/what_machines_does_planet_fitness_use.pdfIn PDF document text
    • http://poziluxolebulu.epizy.com/kosewiwewoxad.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f1e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1E7 1604 bytes
SHA-256: 8e0554eda3bd4e345a0bf1ad92bd9048fe8c2998ae1a0c143bb1f750a98ce5db
font_01_sfnt_off0000fa03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA03 5392 bytes
SHA-256: c13a439127eb36c6dd34c1539da8883b2001358f30b2d25de59a88aa86f36813
font_02_sfnt_off00010c79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C79 11744 bytes
SHA-256: 31053c7c41dcfd690f64608a9024c9361642fa7d6f692a23c1eca3cd60c350f2
font_03_sfnt_off000132fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132FE 16168 bytes
SHA-256: 794d8cc090a449e0d460036171b2d5b2c749cb0dc3f17972c44626ada68ee3d8
font_04_sfnt_off00014804.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14804 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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