Malicious PDF — malware analysis report

Static analysis result for SHA-256 f962cb8a41100fc6…

MALICIOUS

PDF

76.3 KB Created: 2021-03-26 06:44:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 8abc1147f2fb0eee463862aac15b2280 SHA-1: 5bb746fb5e8e3ac6b32465081fbfd53e34dfbc71 SHA-256: f962cb8a41100fc6fe8b5ad0f5dd0fd399e945dca365d72b1e8c0506024752df
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. It contains a large number of external links, many pointing to benign-looking PDFs, but one primary URL, 'https://golowaki.ru/wix?keyword=que+es+un+amor+fraternal', is associated with unknown reputation. This suggests the document is part of a link farm or SEO poisoning scheme designed to redirect users to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • 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://golowaki.ru/wix?keyword=que+es+un+amor+fraternal PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4413865/normal_604a74d080bf7.pdfIn PDF document text
    • https://rugibabolunape.weebly.com/uploads/1/3/1/4/131454120/fabogaz-kisur-zokidazaj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489716/normal_602c0b45ea0c2.pdfIn PDF document text
    • https://cdn.sqhk.co/zidodovare/kghSgdJ/zombie_infection_game.pdfIn PDF document text
    • https://juwaxevepatasi.weebly.com/uploads/1/3/0/8/130874094/e04fc.pdfIn PDF document text
    • https://cdn.sqhk.co/duvetezoje/hhgu3jd/68561037852.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4502870/normal_60113af6cffbd.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/zewimu/apple_watchos_6_beta_profile.pdfIn PDF document text
    • https://s3.amazonaws.com/womirofop/are_tissot_watches_swiss_made.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b5ae77a6-dcb4-4dd6-a39a-09cbc0f74faf/systems_engineer_vs_mechanical_engineer_salary.pdfIn PDF document text
    • https://s3.amazonaws.com/titugome/assignment_format_front_page.pdfIn PDF document text
    • https://s3.amazonaws.com/wujapu/neonatal_abstinence_syndrome_scoring_sheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ac056288-0634-4bda-8afc-81cb50072214/trigonometric_identities_reference_sheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/453045cd-0420-4d69-b68d-5ee3c0f65b66/minn_kota_i_pilot_link_vs_i_pilot.pdfIn PDF document text
    • https://s3.amazonaws.com/tumasun/49211882191.pdfIn PDF document text
    • https://s3.amazonaws.com/kelageketisefuv/44891211166.pdfIn PDF document text
    • https://s3.amazonaws.com/dumupa/98749467309.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6d9a79d7-c463-4666-b668-8e1bf49e5981/federal_custodian_of_records_declaration.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dfd844a8-be0e-43fc-9c24-e3b7c42e29c5/programmable_logic_controllers_kelvin_t_erickson_free_download.pdfIn PDF document text
    • https://s3.amazonaws.com/towutoginadivu/focusrite_scarlett_2i2_setup_windows_7.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_off0000ec11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC11 4976 bytes
SHA-256: 1e7bcfad5cbbe27e00c4cdbe94e61c0fc7c63c6922b279932b1e2a9a9d9c4cc8
font_01_sfnt_off0000fce6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCE6 11636 bytes
SHA-256: 82010cabf9f18c239bd7c812f5fe90bf5200294c7c56a1c77d90e0aee35b7acb

Open this report in the interactive analyzer, or submit your own file for analysis.