Malicious PDF — malware analysis report

Static analysis result for SHA-256 23cc1df5594b7795…

MALICIOUS

PDF

77.5 KB Created: 2021-04-11 05:53:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 9368b3f11b3307f94ccb76b93a1ac5b4 SHA-1: ac1c8510ed5021da55833533d2239438ad098089 SHA-256: 23cc1df5594b77959183a38535addf7c78bb25a4a98d4ec0b98484cb9dfd630f
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 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://xajibur.ru/strik?utm_term=how+to+start+stihl+fs+55r PDF link annotation
    • http://bomaduworofa.medianewsonline.com/9989182119.pdfIn PDF document text
    • http://lishop.site/63172257604pjki4.pdfIn PDF document text
    • http://peguxukeziku.sportsontheweb.net/adolescent_health_care_a_practical_guide.pdfIn PDF document text
    • http://carinsusa.info/spectrum_math_workbook_grade_8_free92cvz.pdfIn PDF document text
    • http://blockingscenery.com/86826210809sibuj.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/7405bf9f-4b13-4604-a6ba-87ffc80fbd3b/how_rich_is_brandon_sanderson.pdfIn PDF document text
    • https://f4e740b0-69d0-4d5c-a0c7-362dc6b2ad6d.filesusr.com/ugd/0356fc_f9858f744e9c449d8cfe8b6184fb15f6.pdf?index=trueIn PDF document text
    • https://4a31e3f8-49e3-4331-b1a9-c0bb7a6b9dbc.filesusr.com/ugd/599f1c_7c659bf9bc81438dacfe7e9702c2b2a0.pdf?index=trueIn PDF document text
    • https://80b1f93a-fe74-4439-a81d-34814fa7a505.filesusr.com/ugd/e56fe2_a7273ed156d5425cbec94a2974b0b101.pdf?index=trueIn PDF document text
    • http://zaxalamel.rf.gd/39071440349.pdfIn PDF document text
    • https://920f4c01-5fd6-4c40-8b27-b99972fecb60.filesusr.com/ugd/d63aaf_07f03bea4aa24227abb765ddb308756e.pdf?index=trueIn PDF document text
    • https://1416a32c-f91c-4ec3-9c10-bfdf610c7df7.filesusr.com/ugd/76de1a_b9121a8d4c5d46f8bb2cc6f29b32aa7d.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/b511ecf9-46b5-441d-845a-0767c0f347f5/kitchenaid_electric_cooktop_installation_instructions.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cbd47590-86bd-4211-b9a8-6b39dfbc540b/62587473681.pdfIn PDF document text
    • https://ecf8b3bd-8201-449f-a39c-156acd88681e.filesusr.com/ugd/97634b_986cf8a1207046469087cf3c10485c9d.pdf?index=trueIn PDF document text
    • http://bagugexasorip.myartsonline.com/99950703247.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/057c92f8-ff00-4d07-9f60-9b470faf7d8b/13813998846.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/43b7023c-ac8b-4bc6-8986-6d53d21079bc/ratexu.pdfIn PDF document text
    • https://4bf641bf-117a-4913-931f-55e49063997f.filesusr.com/ugd/5befcb_0a971a27d32d4f0589d65d13177cc880.pdf?index=trueIn PDF document text
    • http://runezejukasik.epizy.com/xedepiparanezipulutu.pdfIn PDF document text
    • http://bamusob.rf.gd/implosion_full_apk.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_off0000f1c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1C2 5032 bytes
SHA-256: a6ac29c4e074b9101f31714a7d01ccbb6ebc04e199d114d4df0ffdeadce4b679
font_01_sfnt_off000102f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102F2 11168 bytes
SHA-256: db00ff7916381eb1ac605f266ff36a087c9c06e3ff5b3f8a565a87f3c48f0259

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