Malicious PDF — malware analysis report

Static analysis result for SHA-256 090c6aa03142e4cb…

MALICIOUS

PDF

99.0 KB Created: 2021-06-07 13:22:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 34c2077ce44bcbbd04d5cb3f6a789fc0 SHA-1: bdb87b04ed73fb73c4c51c3a67f4d1c86c716f24 SHA-256: 090c6aa03142e4cb45f46db00038b5ff848edf781dcf8d711645d4882ace8e78
186 Risk Score

Malware Insights

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

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous external URLs, with one notable URL pointing to 'nomylo.ru'. The PDF's structure and the presence of multiple external links suggest it is designed to redirect users to potentially harmful websites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://nomylo.ru/pbw?utm_term=vampire+hunter+d+message+from+mars+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4443325/normal_6009d145cf580.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464534/normal_5fdb695b7b35e.pdfIn PDF document text
    • https://dizegixevovule.weebly.com/uploads/1/3/4/5/134576191/7c6dc66d2df0b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445104/normal_606977bdd86bb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449768/normal_6066e270abebf.pdfIn PDF document text
    • https://dosujuge.weebly.com/uploads/1/3/4/3/134305565/e793f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387243/normal_6026345debad9.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/ce98ca00-51ae-488e-ad34-b971a3d02160/best_smart_bracelet_2020.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8786a6ba-ac3c-485f-ba96-35df4f76159d/wwe_draft_simulator_2k20.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dcb8c6a9-715b-4723-b1e4-8780e8db61b5/zedugijosogoruwalejoxuk.pdfIn PDF document text
    • http://fukibaso.pbworks.com/w/file/fetch/144692907/how_to_pass_business_studies_grade_12.pdfIn PDF document text
    • http://pexovobef.pbworks.com/f/64226688196.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f32e0b5e-078c-4b2e-920d-dfbaadd4667b/99574692232.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/03fc7dbc-af0c-44a5-89ca-e4403ad239fc/anatomy_and_physiology_1_lab_exam_4.pdfIn PDF document text
    • http://rasetewi.pbworks.com/w/file/fetch/144668529/free_company_profile_design_template_psd.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2af42c9f-03ec-489d-a79a-2a25620ebaea/el_coran_audiolibro_en_espaol.pdfIn PDF document text
    • http://tevidaxen.pbworks.com/w/file/fetch/144783234/27023527247.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/313e34b2-98c7-4b69-b284-bcaee374979f/how_to_clear_memory_on_omron_blood_pressure_monitor_bp652.pdfIn PDF document text
    • http://vowujepojez.pbworks.com/f/sozabopofafi.pdfIn PDF document text
    • http://jawegele.pbworks.com/f/2013_polaris_sportsman_500_wiring_diagram.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_off00012be7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BE7 6840 bytes
SHA-256: eeb738a035149b8d41bb8e670ddc16a03cedea01adcb09236965cf9bbf10ca3e
font_01_sfnt_off000142ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x142AE 5388 bytes
SHA-256: f8b92eb59be8dc3c400e9d4a4b87f192fd26301703e6b57e7de6e3d025357bff
font_02_sfnt_off000154dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x154DD 12448 bytes
SHA-256: 7a75cce7562893ffff5f53666c8d1d7607b4e40e66b10fa597ab3c0f0c270e65