Malicious PDF — malware analysis report

Static analysis result for SHA-256 c98c52ee896ac1ca…

MALICIOUS

PDF

77.9 KB Created: 2021-02-28 09:23:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 7533c4c01be427cb4e7c0dc252ae8936 SHA-1: a282e0eadb6815e228f1475330cfdbfcae88ebba SHA-256: c98c52ee896ac1ca9814a7fc01e14d3cec4d64f5f20ad6764188ff89daff745b
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with a critical heuristic identifying it as a 'PDF_SEO_LINK_FARM'. The primary malicious URL identified is jumiwimov.ru, which is likely used to host phishing content or distribute further malware. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or trojan distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 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/123?utm_term=free+multiplication+arrays+worksheets+pdf PDF link annotation
    • https://febelozo.weebly.com/uploads/1/3/4/5/134599394/mikarawegatodun.pdfIn PDF document text
    • http://ejqy.com/android_review_notificationsuw6yu.pdfIn PDF document text
    • http://abwaab.su/39115570198qhjd1.pdfIn PDF document text
    • http://koreanluxe.com/amrapali_video_songs2x2qg.pdfIn PDF document text
    • http://frut-tree.site/zoopolis_animal_evolution_clickers84umu.pdfIn PDF document text
    • http://denizan.com/ardic_cable_tray_catalogue9oa5m.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/wajibile/85099547225.pdfIn PDF document text
    • https://s3.amazonaws.com/lusabifef/mexide.pdfIn PDF document text
    • https://s3.amazonaws.com/lixuduwonifa/behance_lite_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/jewizopukuni/dejezulikufibaju.pdfIn PDF document text
    • https://s3.amazonaws.com/pegozegi/video_software_for_iphone.pdfIn PDF document text
    • https://s3.amazonaws.com/rexogeguxosix/3116505168.pdfIn PDF document text
    • https://s3.amazonaws.com/gapivegek/34056949676.pdfIn PDF document text
    • https://s3.amazonaws.com/nigimul/arcserve_bare_metal_recovery_iso.pdfIn PDF document text
    • https://s3.amazonaws.com/novifamigot/mipugajopakebifimagaxes.pdfIn PDF document text
    • https://s3.amazonaws.com/palevijuj/canon_mp250_scanner_driver_download_windows_7.pdfIn PDF document text
    • https://s3.amazonaws.com/minaxigevani/3705050020.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e68a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE68A 5492 bytes
SHA-256: d17266b2e690f5118b8d51c8874253f59e14cea1a5d81f646b47ce3624cbb03e
font_01_sfnt_off0000f915.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF915 10328 bytes
SHA-256: bbae15f481a82bf77d587707f2d5cddd889b3b4cbab501d4ed307cac60b52eaf
font_02_sfnt_off00011c76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C76 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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