Malicious PDF — malware analysis report

Static analysis result for SHA-256 3660521df98eeb4b…

MALICIOUS

PDF

87.5 KB Created: 2021-04-08 00:47:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 568e5348b3a1805f8d069f5d70828e76 SHA-1: 112e0e85b1ad873578a88a18aa82ba5fb5d8b5e4 SHA-256: 3660521df98eeb4b99af62a01d28aadd113be58bc5c68765a7e8d5cd62f49f64
186 Risk Score

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 0.9996

Heuristics 6

  • 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.
  • 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://jacksth.ru/strik?utm_term=who+is+lennie+smalls PDF link annotation
    • https://tepewumulu.weebly.com/uploads/1/3/1/3/131384412/be2592.pdfIn PDF document text
    • https://setovejuno.weebly.com/uploads/1/3/2/6/132682792/batuwetunaxese.pdfIn PDF document text
    • https://xexifenenufomag.weebly.com/uploads/1/3/6/0/136082553/0f937bb0a.pdfIn PDF document text
    • https://dovavifedudefew.weebly.com/uploads/1/3/2/7/132710721/8514282.pdfIn PDF document text
    • https://cdn.sqhk.co/rulopojuna/8je3ehc/haunted_houses_near_me_open_right_now.pdfIn PDF document text
    • https://pizitejipadutim.weebly.com/uploads/1/3/4/4/134469061/rewuxobo.pdfIn PDF document text
    • http://bagerisevi.scienceontheweb.net/zemaker.pdfIn PDF document text
    • https://revarepafe.weebly.com/uploads/1/3/3/9/133997647/9459671.pdfIn PDF document text
    • https://cdn.sqhk.co/dijogiper/gcZmigi/car_racing_2019_mod_apk_download.pdfIn PDF document text
    • https://cdn.sqhk.co/tukutabu/CHSjjhd/straight_bill_of_lading_short_form_sample.pdfIn PDF document text
    • https://xifalazixaxidig.weebly.com/uploads/1/3/0/8/130874217/8f74a2.pdfIn PDF document text
    • https://cdn.sqhk.co/mopomotop/PjnDVjb/16964527377.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/86c532f7-2762-4f12-a318-cbd5abf3edc2/firifofenewegadironib.pdfIn PDF document text
    • http://rugoxesoteko.myartsonline.com/the_art_of_assembly_language_download.pdfIn PDF document text
    • http://kufekisawisewo.onlinewebshop.net/zeburiteb.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/306c0d08-0d9c-40f5-9034-2a8e907b1e21/58957252050.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8847bd21-6e76-4e26-b0dd-da3f56880e47/fejukozego.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c3e00ed4-7632-4775-ae27-c9b5056b0f38/23601788358.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e912ab24-bfa2-4ed2-8bc3-8a9856757693/calculus_1_free_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/20f09957-2394-45f3-9f1d-bf62eaad1b3f/actiontec_pk5000_dsl_modem.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4a61d3ab-2f4c-4126-b336-d84858732392/stressed_out_tomsize_remix_twenty_one_pilots_lyrics.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cdf9583c-0b9d-41a9-b6aa-993e9518e7d8/washington_dc_weather_snow_wednesday.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_off00011aeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AEB 4840 bytes
SHA-256: 6b322c6212f625bc64fcee9e75b1519c7681cb32f546739cc7e927da06810147
font_01_sfnt_off00012b43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B43 11084 bytes
SHA-256: 83eacc6b792785ba9d26c6a4066634a5b2e7c793b3ecd98548da523cbad5be4b