Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8e258a9305e1c5a…

MALICIOUS

PDF

78.0 KB Created: 2021-05-08 13:28:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 2c8b59ab8297daf828aa1949aa9f4f65 SHA-1: 279080f40a48cf2cdd569c55b3f001cb000f3e77 SHA-256: c8e258a9305e1c5a1aa7c8e4943e000e63f3eb08edefe17d8db74884b2a6fc8f
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The file functions as a link farm, containing numerous external URLs pointing to various websites, some of which are hosted on disposable domains. This technique is often used for SEO manipulation or to redirect users to phishing sites or malware downloaders.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://baarspo.ru/strik?utm_term=sas+survival+handbook+1st+edition PDF link annotation
    • https://nazoxuja.weebly.com/uploads/1/3/2/8/132814973/gerogani-zamopexekej-tesufawijewekek-pepubetilubawax.pdfIn PDF document text
    • https://togurugake.weebly.com/uploads/1/3/1/4/131412858/gagaditeziwiwozexuno.pdfIn PDF document text
    • http://miraluvofizobe.medianewsonline.com/bonos_de_carbono_peru.pdfIn PDF document text
    • http://valuburikodajad.medianewsonline.com/2012_camaro_repair_manual.pdfIn PDF document text
    • https://pulezigo.weebly.com/uploads/1/3/4/6/134600697/6caaf6a0d.pdfIn PDF document text
    • https://vibitaxipeni.weebly.com/uploads/1/3/4/5/134526550/konavev-bikomevoxilo-vumutapuna.pdfIn PDF document text
    • https://gegaminowudajun.weebly.com/uploads/1/3/4/0/134041134/warinuwon_gelub.pdfIn PDF document text
    • http://dunizajo.66ghz.com/accident_prone_zone_information.pdfIn PDF document text
    • https://rabexowubomisuw.weebly.com/uploads/1/3/1/4/131407155/wodogote.pdfIn PDF document text
    • https://bexubefobex.weebly.com/uploads/1/3/4/4/134476762/83f0ed3.pdfIn PDF document text
    • https://nutifikidejuz.weebly.com/uploads/1/3/4/3/134347692/razifofusomomaw_gujoxugejakuput_ranep.pdfIn PDF document text
    • http://loxigedu.iblogger.org/jaya_kishori_bhajan_video_pagalworld._com.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://8be317c1-93d6-4444-9a1c-030c84ae583f.filesusr.com/ugd/709942_65046379f5e240418ff39f18c7a9f9f1.pdf?index=trueIn PDF document text
    • http://zalolod.epizy.com/assessing_listening_buck.pdfIn PDF document text
    • http://savefativiluz.epizy.com/pdf_acrobat_pro_free_trial.pdfIn PDF document text
    • https://781b76d0-895c-4d4e-90f3-491762fad171.filesusr.com/ugd/894952_3925889eee1b42bf85d4037d117bfb12.pdf?index=trueIn PDF document text
    • https://0dea665b-aaaa-42f3-a52c-f86f0fd1efa2.filesusr.com/ugd/8b9728_e8604e1fd7cc4e3a8d44913bb03366bb.pdf?index=trueIn PDF document text
    • http://vowefaxi.epizy.com/bajrang_bali_dj_songs.pdfIn PDF document text
    • http://zitejilid.epizy.com/what_is_the_limitation_of_sequential_data_structures.pdfIn PDF document text
    • http://jezevenakos.myartsonline.com/39590769732.pdfIn PDF document text
    • https://eed7fa7e-4f31-4ba6-8269-e73f07ac74c5.filesusr.com/ugd/93374d_55cc94bbd7604dbe99134b5bb0cba19b.pdf?index=trueIn PDF document text
    • http://padekapekalerel.rf.gd/adm_annual_report.pdfIn PDF document text
    • https://50aad03f-9d2a-47e6-be13-abd12f321b17.filesusr.com/ugd/3fd638_229dc5f2ceb44d4fb2b955790b56d063.pdf?index=trueIn PDF document text
    • http://foduwisidowej.rf.gd/view_instagram_stories_anonymously_android.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_off0000f38b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF38B 5332 bytes
SHA-256: 86847cd6a3723b4e8e5b3602dc96338e27079fa3de29fd43c008e7cd6d8cd69d
font_01_sfnt_off000105a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105A3 10808 bytes
SHA-256: e9faa5e1d4d72d876a7e72bffd21e17119c9c206f0f762104788f18329b0662c