Malicious PDF — malware analysis report

Static analysis result for SHA-256 0ef646c4ae4efdc9…

MALICIOUS

PDF

80.4 KB Created: 2021-04-17 01:33:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dec4677ff0b12e75352120b8f672b19f SHA-1: 7ae3a31d7d5b1e8f556fc55dc7be1bde8947b378 SHA-256: 0ef646c4ae4efdc96cc9d22095e7693fbd266c982f771e272f7b06e56e5923ab
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many of which are part of a link farm designed to artificially boost search engine rankings. One prominent URL, https://jacksth.ru/strik?utm_term=how+to+pair+turtle+beach+elite+800+to+ps4, is directly linked to the document's apparent theme. The presence of a PDF link farm and the ML classifier's high confidence score indicate a malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://jacksth.ru/strik?utm_term=how+to+pair+turtle+beach+elite+800+to+ps4
    • http://lewoluxadet.iblogger.org/maths_formulas_of_trigonometry.pdf
    • http://pifafixejizigu.scienceontheweb.net/musgrave_public_finance.pdf
    • http://simopuvoramawu.mywebcommunity.org/30785513696.pdf
    • https://cdn-cms.f-static.net/uploads/4392210/normal_60270ae83ce59.pdf
    • https://static.s123-cdn-static.com/uploads/4388279/normal_5fe02e04cd6c9.pdf
    • http://gazupoz.sportsontheweb.net/aula_internacional_1_nueva_edicion_libro_del_alumno_download.pdf
    • https://static.s123-cdn-static.com/uploads/4459469/normal_5fe34eac7e76d.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://fufibilola.epizy.com/what_is_ieee_in_computer.pdf
    • http://gowamatul.epizy.com/iron_ore_beneficiation_plant_process.pdf
    • https://2ae8fa2d-8b21-4cd7-bd94-b44763fb9b4d.filesusr.com/ugd/8e1ec7_1c7e61c58c574dc0972bd25cd1421c1f.pdf?index=true
    • https://4bd9ed84-c80b-4837-bb2f-b1353ebfd8aa.filesusr.com/ugd/5a1791_25af0fc46a1f47db8c7eaa99a5649926.pdf?index=true
    • https://19972ee8-34f0-4900-8009-9f590161cd02.filesusr.com/ugd/64db51_2bab9a21b7504820b42bd8caf14c2e22.pdf?index=true
    • https://836291d8-7b77-40db-be8c-3105928c7ef3.filesusr.com/ugd/aae074_107d425d84be4a0ea19297abc810edcb.pdf?index=true
    • http://sutexuvidag.myartsonline.com/how_to_prepare_for_a_home_kitchen_inspection.pdf
    • https://34e223d5-b18a-4f89-96b3-7c58aa965d90.filesusr.com/ugd/440e29_88315572764b4bef9555e3212bb57d0d.pdf?index=true
    • http://roradom.epizy.com/what_is_the_best_strength_training_app.pdf
    • http://zexenafejesited.rf.gd/miller_and_levine_biology_online_textbook_macaw.pdf
    • https://3a5aa097-47f9-475f-9992-83bceef25cc3.filesusr.com/ugd/f55bec_0f394d774f27434baf2bea8549b3c9e3.pdf?index=true
    • https://9049409e-dcbb-43fe-b7cb-0f7a5d042cf1.filesusr.com/ugd/e59eee_b744d60accbe4e0eab474146427ec47b.pdf?index=true
    • https://1d942ef5-affb-47d8-8f99-70a3d187b733.filesusr.com/ugd/3283b0_da6ff5770e324193a310de8db5a40870.pdf?index=true
    • https://4cf2acc4-d143-4013-a78d-f21de0873c4f.filesusr.com/ugd/e4636f_a5acc1116209466a9b91eb6b4c055330.pdf?index=true
    • https://720c7b34-a033-4bf0-83ea-6be17de98aa2.filesusr.com/ugd/03ef8e_fafe9e7aafdf4d39a65c41f982848f6f.pdf?index=true
    • https://49432a94-54bc-4d13-9d12-ea41d731e1b8.filesusr.com/ugd/a7c689_f5dca347ddde4c8096f0a0b7820fa470.pdf?index=true
    • https://19972ee8-34f0-4900-8009-9f590161cd02.filesusr.com/ugd/64db51_f782c9abd047438fa0643c29a97f4c34.pdf?index=true
    • https://fb79ad55-22b5-4823-9538-35c71bbbd514.filesusr.com/ugd/ea423f_4466c129879a43ad868ad6856ad324c2.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fb7b.bin
992e832892c55fe5fc9a5d859c577d0bf03aa22c6d4cf51214793ca9bc1143cc		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFB7B 5640 bytes
font_01_sfnt_off00010eb0.bin
39717aa435506c60f1a4ee41fd452a5c61f827115876eb23d8ff44bcb437ad47		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10EB0 10968 bytes

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