Malicious PDF — malware analysis report

Static analysis result for SHA-256 85cc1135c4512c94…

MALICIOUS

PDF

77.1 KB Created: 2021-04-01 10:44:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 5affcc8608836757d5cbececf8a2d0c1 SHA-1: 318f7521e1e9b9408365cb14ac17b06749c5ee49 SHA-256: 85cc1135c4512c947fd5fa9e14bb2d110d489d06b2e30f12f6fa7c1c3c6c14da
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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.
  • 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://kuzutuzo.ru/strik?utm_term=who+moved+my+cheese+book+pages PDF link annotation
    • https://xenesadu.weebly.com/uploads/1/3/0/7/130739949/3556311.pdfIn PDF document text
    • https://rikizanasurixa.weebly.com/uploads/1/3/1/3/131379420/6615445.pdfIn PDF document text
    • https://tupobufilu.weebly.com/uploads/1/3/5/3/135310482/1150288.pdfIn PDF document text
    • https://fomunova.weebly.com/uploads/1/3/4/6/134684458/rasos-vedomuxawu-bemolilojipa-potapawasejube.pdfIn PDF document text
    • http://appletopshop.ru/movie_website_for_mobile_phonest4zqq.pdfIn PDF document text
    • https://xilamexazoleguj.weebly.com/uploads/1/3/2/6/132695560/zutojazosewebe.pdfIn PDF document text
    • http://i-men.ru/free_bootstrap_templates_admin_dashboardoa8t2.pdfIn PDF document text
    • http://itnegozio.info/formatos_para_abrir_una_empresasmc5b.pdfIn PDF document text
    • http://de-bewertung-889562.icu/john_deere_mower_parts_diagramk6bll.pdfIn PDF document text
    • http://laura-egorova.ru/kujalarilokubuq9s2.pdfIn PDF document text
    • http://uscovidcharts.com/vepakumaritisetazulidbxt58.pdfIn PDF document text
    • http://sberbank.link/how_to_fix_a_stuck_pull_cord_on_a_lawn_mowercymx0.pdfIn PDF document text
    • http://helpcopyright-service.com/xejiwpknbb.pdfIn PDF document text
    • http://goodsfor.life/85439774247r98z9.pdfIn PDF document text
    • http://itayoga.space/numerologa_angelicalahjnt.pdfIn PDF document text
    • http://idslim-italia.site/game_launcher_tuner_for_boosting_performance_pro_apkvfsgp.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/fbbc20bf-580e-411b-afbd-64f43d7d604c/69022670908.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/78147e4e-2934-45ac-a7d6-8f6315a3e0d6/psychology_spirituality_best_self-help_books.pdfIn PDF document text
    • https://bac325b5-3710-4a60-ba01-c1ac5e8a7650.filesusr.com/ugd/c111de_24b210d8924f487fa9a8f13499a484ee.pdf?index=trueIn PDF document text
    • https://c3438639-6a75-4920-aa4f-d1e0b619354f.filesusr.com/ugd/3be3a7_78ed63e2e5ec49efada056dbda2e22ce.pdf?index=trueIn 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_off0000efec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFEC 5740 bytes
SHA-256: 4d6f5d7a57dab05bebacbf92758b399dcd0cea5768c41a906533bde38787dcdb
font_01_sfnt_off00010368.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10368 10500 bytes
SHA-256: 2971cff460979f44212d9e7304aa181fb00c42aceb6d2ea8488bceee206814ed

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