Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b6bfba468b3be87…

MALICIOUS

PDF

77.4 KB Created: 2021-05-22 00:00:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 01befa004a08a3be01645c84b27454ff SHA-1: 858f52a2f2a62d5c684e603556929521bcec9a32 SHA-256: 8b6bfba468b3be875ca32e4ef9e322eb0b331ca305e15fd877ba9c8919ffcf34
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of external links, many of which point to SEO-optimized PDF files, suggesting a link farm designed to drive traffic to malicious sites. One prominent URL, 'https://jumiwimov.ru/strik?utm_term=coreldraw+x8+with+crack+free+download', directly advertises cracked software, indicating a phishing or scam attempt. The ML classifier and ClamAV detection strongly support the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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 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.
  • 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://jumiwimov.ru/strik?utm_term=coreldraw+x8+with+crack+free+download PDF link annotation
    • https://numusebitekamun.weebly.com/uploads/1/3/4/8/134871234/wiboxibepo-davis.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483365/normal_5fd110c1e4a9b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489241/normal_5fdf01551186c.pdfIn PDF document text
    • https://gojijaxokan.weebly.com/uploads/1/3/0/7/130739343/1450286.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4381082/normal_5ff66a1aa438b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379851/normal_606e02ac7c9d2.pdfIn PDF document text
    • https://polatubogo.weebly.com/uploads/1/3/4/5/134598163/8ecfa5e7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367299/normal_603a520ba983f.pdfIn PDF document text
    • https://lefawiput.weebly.com/uploads/1/3/5/3/135324435/getexukon.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403814/normal_6020908ec8b8f.pdfIn PDF document text
    • https://dasujodiket.weebly.com/uploads/1/3/4/4/134481559/xemomikam_zigirupabewavi_nafuledirasulo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490273/normal_600a41e4d6e6a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391954/normal_60531398cffb8.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/fe296842-6f71-4e0a-b906-75bd2f21ef25/federalist_70_quizlet_ap_gov.pdfIn PDF document text
    • https://s3.amazonaws.com/wiwamoxamo/implementation_schedule_template_excel.pdfIn PDF document text
    • https://s3.amazonaws.com/batoragubukepo/wetovopudotijulibiz.pdfIn PDF document text
    • https://s3.amazonaws.com/pigolo/rock_climbers_training_manual_review.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d6226dfa-d71c-48c7-998f-200f7f2a728c/what_do_i_do_when_printer_driver_is_unavailable.pdfIn PDF document text
    • https://s3.amazonaws.com/baxunaf/cozy_grate_fireplace_heater_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/zugutixe/angels_and_airwaves_songs.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bbe0d349-5883-46c1-8881-3c581b441f9e/eureka_whirlwind_litespeed_filter.pdfIn PDF document text
    • https://s3.amazonaws.com/xabalaru/electrolux_ultra_active_cyclonic_vacuum_cleaner_manual.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_off0000f0ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0AB 5256 bytes
SHA-256: 8627bd55ff1fe2f33ae8c503591c011396eed99e7eaf46ef86319966744ce429
font_01_sfnt_off00010295.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10295 10972 bytes
SHA-256: d387cbf3852e5d042aa5fb1b872828b4f57219f349a7d138cfa46c47d85d05ea

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