Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef5a06a9174b1107…

MALICIOUS

PDF

77.3 KB Created: 2021-04-30 05:31:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 6ee1a6db964360a3e9a23c622a2dc826 SHA-1: bd59bf1284686038923e11f3dbed61cb96e42027 SHA-256: ef5a06a9174b11076f4feaff8b095b372d722aed3f294ec5610653415b638afd
126 Risk Score

Malware Insights

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

The PDF contains multiple heuristics indicating it is a link farm and a phishing attempt, with ML and ClamAV flagging it as malicious. The embedded URLs, such as 'https://resalured.ru/strik?utm_term=reddit+cyberpunk+ps4+review', likely lead to malicious content or phishing pages. No scripts were extracted, but the PDF structure and URL patterns are strongly indicative of a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://resalured.ru/strik?utm_term=reddit+cyberpunk+ps4+review PDF link annotation
    • http://omoikiri.info/38314965694d8neh.pdfIn PDF document text
    • http://laithub.pro/29206193398zxjl.pdfIn PDF document text
    • http://coloradocustomelectric.com/estimating_in_building_construction_free_downloadl2wh5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490138/normal_600ab0dc176d9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4504791/normal_60221d524b2c8.pdfIn PDF document text
    • http://leyloften.online/how_to_do_fractions_on_a_casio_fx_260_solar_calculatorl5n0u.pdfIn PDF document text
    • http://kinokaiff.space/juworowexawokifiruxrupu.pdfIn PDF document text
    • https://dusonomikeka.weebly.com/uploads/1/3/2/6/132695238/xinazodolij.pdfIn PDF document text
    • http://zabozukatipu.iblogger.org/they_say_i_say_the_moves_that_matter_in_academic_writing.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416305/normal_604ce6078e879.pdfIn PDF document text
    • https://xotituwidekave.weebly.com/uploads/1/3/4/5/134585458/binejitazafiwowen.pdfIn PDF document text
    • https://jeretidaker.weebly.com/uploads/1/3/4/5/134595905/1389656.pdfIn PDF document text
    • https://fexejazawipezes.weebly.com/uploads/1/3/4/8/134869354/4594611.pdfIn PDF document text
    • http://kenaxifinot.22web.org/christie_cancer_information_centre.pdfIn 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://627f215e-41ba-4aa4-9906-5f9f9d117739.filesusr.com/ugd/8ab72e_455b2245884e4a10ad5ab008cf0928aa.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/c07ceb8f-a049-404e-957e-a5ae6af2fa70/firesawidakide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ff0b51c1-0fd0-4078-a5a9-99d4f690d9ed/15263653486.pdfIn PDF document text
    • https://b84c3727-5d5a-4c5d-9d5d-21cac87b3a69.filesusr.com/ugd/fdd6c2_3733f58c844a4895a77992df144d5092.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/d76e7a8e-4b37-46ea-a9b7-050a80900b36/interview_questions_for_support_worker_learning_disabilities.pdfIn PDF document text
    • http://xegefonupekowa.epizy.com/35659838714.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1a905e7c-d879-44b9-82ba-33869df07e84/what_happens_if_you_ask_alexa_to_fart.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/675d8ce3-5c85-44a9-8104-72fd01c23d79/family_tree_microsoft_template.pdfIn PDF document text
    • http://witeguxatuzidaj.epizy.com/81654618920.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e30a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE30A 5148 bytes
SHA-256: ebdd6d3418db334fe112bed308e652faf256ba09aea404eb5b271a293b026d66
font_01_sfnt_off0000f4b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4B8 10736 bytes
SHA-256: 57e0918cbbf67b2b4a8cc67b2f9790ff2fcfecd7eb69936b92e16261730380f1
font_02_sfnt_off0001197b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1197B 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e