Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5b8a0ddadf544c4…

MALICIOUS

PDF

78.7 KB Created: 2021-04-20 06:49:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 1b5f7010ddad4f132eb90eaa12a68bf4 SHA-1: 8b3f175417b6958158a457b6ed62aa33077a375d SHA-256: b5b8a0ddadf544c4fb057564f87b2155266aa36829a16496ca81f443140d8ba0
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing or trojan variant. It contains numerous embedded URLs, many of which point to disposable hosting and are part of a link farm, suggesting an attempt to redirect users to malicious sites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a deliberate structure for hosting multiple links on potentially untrusted domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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
  • 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=classroom+management+plan+sample PDF link annotation
    • https://levusukep.weebly.com/uploads/1/3/0/8/130814129/vutufo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445320/normal_604642efe82e5.pdfIn PDF document text
    • https://ketadamofexawun.weebly.com/uploads/1/3/5/3/135349072/rixavokorasup.pdfIn PDF document text
    • http://bezovamakuru.22web.org/53727217501.pdfIn PDF document text
    • https://gilawidukawopux.weebly.com/uploads/1/3/2/7/132741225/duxawiwawiva.pdfIn PDF document text
    • https://cdn.sqhk.co/luzeginu/ji8ieGi/shaolin_kung_fu_vs_street_fighter.pdfIn PDF document text
    • https://cdn.sqhk.co/waxobakal/gKHigAZ/black_friday_playstation_store_2019_date.pdfIn PDF document text
    • https://cdn.sqhk.co/fekerepusa/eggijhf/costume_ideas_for_men_2020.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380086/normal_5fd9bb42ad478.pdfIn PDF document text
    • https://vejiledulibona.weebly.com/uploads/1/3/4/3/134318828/805e82f3c0b2f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369922/normal_5fe45f67eba8c.pdfIn PDF document text
    • https://cdn.sqhk.co/nakusunegud/ieOPicx/bomefajaveleroj.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://neropexuzex.rf.gd/brother_embroidery_thread_color_chart.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0b17cbb6-f510-4846-9178-8995aadcf980/78646658243.pdfIn PDF document text
    • http://kebawobokatole.rf.gd/22137465333.pdfIn PDF document text
    • https://s3.amazonaws.com/bitizopovopaso/datapadazivedajerutu.pdfIn PDF document text
    • https://s3.amazonaws.com/lanaladu/admission_form_format_for_institute.pdfIn PDF document text
    • https://s3.amazonaws.com/womirofop/mugepekojipoda.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7e71c2ca-990b-4d4b-b123-fdab58d99722/21837973808.pdfIn PDF document text
    • https://s3.amazonaws.com/zemunomipazikez/questions_for_your_dnd_character.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0411542d-602e-463f-9a99-1d09b7884f79/gudasorodapetukopabixuzaw.pdfIn PDF document text
    • http://xizemem.rf.gd/wagatevebaguwazip.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_off0000f8a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8A6 5044 bytes
SHA-256: 543ab4d7af95d7edc7bf4d89f755c196ccf71ddbf4fd0d4f4a8d0e3f8f4f9387
font_01_sfnt_off000109b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109B5 10584 bytes
SHA-256: 8bea4dc11bfbc7ed56cee53a091bfa2aef33ab7298dcc3ca9a347dd64d88b144

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