Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9b05f44a8f95140…

MALICIOUS

PDF

77.1 KB Created: 2021-03-29 05:52:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 2bf3cf27e2e44f72f65846f60e2cc400 SHA-1: 185855305ad2e0c21f5a1afbda53274a2b5e9778 SHA-256: d9b05f44a8f95140b5f0be65e5cd80b8f23e71d8888090fed6a79da08332c0c9
194 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 and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://dugedepap.ru/wix?keyword=stick+wars+hacked+apk PDF link annotation
    • https://cdn.sqhk.co/fodexuxefeba/hcEhh2P/kpop_groups_that_disbanded_in_2018.pdfIn PDF document text
    • http://fuxuxixigu.scienceontheweb.net/the_celestine_prophecy_insights.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413697/normal_60062650cb6d5.pdfIn PDF document text
    • https://cdn.sqhk.co/pefisemise/ihfmgjx/42007340205.pdfIn PDF document text
    • http://katipef.medianewsonline.com/timulomuni.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480145/normal_603f67ece5b53.pdfIn PDF document text
    • https://cdn.sqhk.co/xudevekelefe/gdjjjaL/grey_and_white_world_map_poster.pdfIn PDF document text
    • https://cdn.sqhk.co/nizivatitogu/iicihgi/bazujigoxabefuwo.pdfIn PDF document text
    • http://doridusa.medianewsonline.com/lonely_planet_hiking_in_japan.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389074/normal_602a84e3ca88b.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://a8fdb364-3865-4521-a36b-e12f4de7752f.filesusr.com/ugd/e20637_8858a0a0b4e746e8979c1210a1cfad99.pdf?index=trueIn PDF document text
    • https://459ec6dd-5b69-4322-a182-74abbfaa0e48.filesusr.com/ugd/221eaa_85ac65af79f641a8817e3f7f9d74372c.pdf?index=trueIn PDF document text
    • http://vesedakowata.onlinewebshop.net/log_and_antilog_amplifier_download.pdfIn PDF document text
    • https://2ddedb0e-b7b0-41c9-a8bc-c018bd0e6e4c.filesusr.com/ugd/70094d_7df0eb105c0b4ede8afd3238858d756f.pdf?index=trueIn PDF document text
    • http://sazebufaz.atwebpages.com/lusarufevenodamepa.pdfIn PDF document text
    • https://c1908cc8-b41e-4b5b-ab1c-53d28a7f2745.filesusr.com/ugd/913720_2d30603d9d0440a897f10336d83f960b.pdf?index=trueIn PDF document text
    • https://33b7cf8b-1cb2-46d9-9063-17e97cba5e80.filesusr.com/ugd/9edd50_4e8118c56a7a4a769e3c6b2edb0dab7e.pdf?index=trueIn PDF document text
    • http://jozilaro.atwebpages.com/belle_s_library.pdfIn PDF document text
    • https://2ae8fa2d-8b21-4cd7-bd94-b44763fb9b4d.filesusr.com/ugd/8e1ec7_a9edfbb8a8454f549c5ae6787c4e7750.pdf?index=trueIn PDF document text
    • https://02aee961-309f-4c8b-9790-08f12c26706e.filesusr.com/ugd/8321db_df1cbf6dd10d4acd827152c33e1f5454.pdf?index=trueIn 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_off0000ef27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF27 5388 bytes
SHA-256: cbc80e19c5412e0e5fdabe755ac087d9e784936198d4e07e19d40328c8dad4cf
font_01_sfnt_off0001018b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1018B 11136 bytes
SHA-256: 8d31a94dc18657093b701d5e971b1a9edeb1dbf0fbf08cff10a09ab4daed6cba