Malicious PDF — malware analysis report

Static analysis result for SHA-256 99124c765046e958…

MALICIOUS

PDF

74.0 KB Created: 2021-03-30 22:44:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 3338efaa53a9fba4ceef5ccec2d6235f SHA-1: 65ccbda58010bb796aa9bd735e97de8a57b788ac SHA-256: 99124c765046e958745288607343af241a7ed0ebffc106d63c8726b3ccdcb489
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm designed to redirect users to potentially harmful sites. The primary malicious URL identified is https://mezovuduw.ru/award, which is likely used for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://mezovuduw.ru/award?keyword=child+and+adolescent+psychology+book+pdf PDF link annotation
    • https://rizigavitud.weebly.com/uploads/1/3/4/5/134581125/tixuvoguteji-seberibupegoluv.pdfIn PDF document text
    • https://pozajuraxox.weebly.com/uploads/1/3/4/5/134591712/roxigajubufug.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402503/normal_6023494dd9de4.pdfIn PDF document text
    • https://fedebeforejasu.weebly.com/uploads/1/3/4/4/134498020/ebd8da1297d.pdfIn PDF document text
    • https://romesezex.weebly.com/uploads/1/3/4/6/134605020/111642.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4471691/normal_5ff7610b154f5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420752/normal_5fc68007a11b6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425238/normal_60152f45cb540.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408483/normal_6052abdd66cdc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403808/normal_5fdea29e30a72.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488090/normal_6056f236d6d82.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/06c8c9e8-d5a0-424f-a4f2-4f7070ccac86/80127817719.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2f1ab9a2-8dc2-48ef-9a39-ab78638be27f/que_es_una_empresa_industrial.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e3d059d5-f1fa-4be0-9842-b732551d78a9/68253979643.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cbef79c8-0008-4acb-a152-5a75ce1b3252/fundamentals_of_physics_10th_edition_extended_solutions_slader.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2ab52852-bb1d-4e7b-84af-770de1266a25/dorufaxigodumudawufoju.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/81adfb8c-67e6-4428-a4e8-3a28eaba2981/83915544334.pdfIn PDF document text
    • http://tularapexodubi.rf.gd/ridudabu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8f84ae1b-f7c7-4299-a105-f6f7a15a145e/delutekebinumajijolu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/925de7a2-6fe3-454f-8ddd-ce37dade4a4e/sajavikajuj.pdfIn PDF document text
    • http://wogomud.epizy.com/sexagopipekovatelasorokat.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9981795e-cbd7-4dd3-b081-2eeb2b52b735/equate_wrist_blood_pressure_monitor_error_3.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_off0000da82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA82 2828 bytes
SHA-256: eec2311198495a4bc353016469730966835d49679daeed18a98faa9ab15954d4
font_01_sfnt_off0000e48c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE48C 5532 bytes
SHA-256: a7188408968b2ded730fbfce7770c9a47cd569c517cfb1aac85187dbf6ea6365
font_02_sfnt_off0000f769.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF769 10244 bytes
SHA-256: 8f4dfcdb51bf4f9ae44e945dd50574cd7afec2a3c9cb8a506cbe062dcf156c23