Malicious PDF — malware analysis report

Static analysis result for SHA-256 436306d9caecd879…

MALICIOUS

PDF

84.8 KB Created: 2021-04-18 00:03:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 47be6e06cdcf17823898eeade74fd990 SHA-1: 2402b093a2b08ade18a05bcf7752644aa1956c13 SHA-256: 436306d9caecd87964edf93dd74bca83c611cac0ef31e661ef8c2e7d3d79f22d
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are numerically or generically named, suggesting a link farm for SEO manipulation or traffic redirection. The primary external URI points to 'https://dafemum.ru/strik', which is likely the malicious destination. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://dafemum.ru/strik?utm_term=best+spoken+english+book+in+bengali+pdf
    • https://static.s123-cdn-static.com/uploads/4366366/normal_5ff828b0e7a40.pdf
    • https://cdn-cms.f-static.net/uploads/4472760/normal_606a409816937.pdf
    • http://jivizebunov.22web.org/wupofonevereruwomemixe.pdf
    • http://agreevudb.rest/how_to_connect_logitech_k360_bluetooth_keyboardxbjkw.pdf
    • http://affilateapp.online/how_to_connect_afterglow_controller_to_nintendo_switch0prte.pdf
    • https://static.s123-cdn-static.com/uploads/4462708/normal_5ffc823a563b8.pdf
    • http://lidlid.xyz/6559264009tvr0a.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/9049167f-3dfd-4d90-878c-fe135dffce35/87672766211.pdf
    • https://6bc553e5-d0de-4278-827a-c77c8eb32fbd.filesusr.com/ugd/4a6c57_36f20e51b95c400ea736e51524093255.pdf?index=true
    • https://uploads.strikinglycdn.com/files/71554943-158c-4472-a724-6e8b32fa40a5/how_to_remove_icloud_activation_lock_without_password.pdf
    • https://uploads.strikinglycdn.com/files/6062cc38-a4ae-4e0b-bfd7-2bcbc7647bcb/brother_project_runway_limited_edition_ls2250prw_manual.pdf
    • http://gebukoxidu.rf.gd/rorewudo.pdf
    • https://3d7304b5-8527-495f-b913-615d6f357a43.filesusr.com/ugd/ef7486_9586ed9c958b4901b020f2451633e48a.pdf?index=true
    • https://ebd157e6-94c3-4ff5-b3ab-516f87acbde6.filesusr.com/ugd/e87473_227b6598b9fe440cb8eb3c076d43c0e9.pdf?index=true
    • https://uploads.strikinglycdn.com/files/a5170038-b6e0-4b5b-b1ec-a6fdadda492c/sopasitedi.pdf
    • https://uploads.strikinglycdn.com/files/ccfeb3bc-b5a3-4db9-b6c6-dc492598bcae/breakfast_at_tiffanys_book_pages.pdf
    • https://uploads.strikinglycdn.com/files/c8065469-f576-4eb5-beaf-32f4adb3ffba/black_stone_cherry_the_human_condition_gold_vinyl.pdf
    • https://uploads.strikinglycdn.com/files/0886486f-1ef7-4e06-8e1d-85514b4b18d6/90852233071.pdf
    • https://uploads.strikinglycdn.com/files/103bffa4-6841-4b95-bae3-0971c8e7918c/35138058842.pdf
    • https://uploads.strikinglycdn.com/files/deb8bfcc-ccd0-40ec-bcfb-cfbbf68334e2/how_to_use_radio_shack_digital_multimeter_22-820.pdf
    • https://44dd6259-7513-41c7-b2f1-b2b1fc385d2e.filesusr.com/ugd/63022f_f3b390744b194c509efe7985235cffe6.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL
    • http://www.geocities.com/mitra_anirban/hobbies.htmGNU
    • http://www.gnu.org/copyleft/gpl.htmRegular

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eb85.bin
90b5f0a15c04118b92f9f3afd12fbd6fad833d430a7b91df5093ef361d8f5b2c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEB85 5460 bytes
font_01_sfnt_off0000fe15.bin
f53ad6ebe74a0c029577c55bffac06eea7c661fccaef40488463af1e5436ce7a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFE15 10644 bytes
font_02_sfnt_off00011e9c.bin
936a6e5ef90762281ce2578b46fcbf6dcde389be826775c36287976ff6420b18		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11E9C 11648 bytes

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