Malicious PDF — malware analysis report

Static analysis result for SHA-256 870bf27bd91612ee…

MALICIOUS

PDF

84.6 KB Created: 2021-03-23 08:26:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 670b9461668eefbe174365c3dfa67c81 SHA-1: 5cc9a91fed0155534e1cc7c2e5431ab3a77dcc2e SHA-256: 870bf27bd91612ee6cac42ce1d3c1cca6eaffca3925de64bcd3282ff8a968f2e
186 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. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://lozipotod.ru/wix?keyword=cee+lo+dice+casino PDF link annotation
    • http://watertea.space/odd_one_out_worksheet_for_grade_1qyln8.pdfIn PDF document text
    • http://1xbet-football.fun/duralast_700_peak_amps_jump_starter_price85m3c.pdfIn PDF document text
    • http://aarbuz.space/toefl_structure_exercisealiot.pdfIn PDF document text
    • http://collegegraduatecentraldating.com/how_many_months_in_a_year_worksheet1bfb6.pdfIn PDF document text
    • http://winsl.space/nomowofewudonidesajez0xrv.pdfIn PDF document text
    • http://closemaze.com/allegiant_flights_to_florida2citf.pdfIn PDF document text
    • http://tixshopclub.space/890555502528aoh6.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/6585cab3-5896-41cb-9adf-132fb0a9be26/computer_system_validation_training.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/82c53ec8-64fc-4375-8338-f8f3d9aa57e1/48689752283.pdfIn PDF document text
    • https://s3.amazonaws.com/lebaxa/kembalinya_anak_iblis_full_movie.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d870ad88-ef62-47be-88fa-87184578d2c0/what_qualifications_are_needed_for_a_veterinary_assistant.pdfIn PDF document text
    • https://s3.amazonaws.com/wizitifowubux/nccn_guidelines_breast_cancer_screening.pdfIn PDF document text
    • https://11484d69-1612-41b9-9199-165df1f08223.filesusr.com/ugd/e2f197_f68fb4db7690489f95d74c146ba904c8.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/12227d38-c121-4773-b2f9-50c0027624ae/17576075844.pdfIn PDF document text
    • https://s3.amazonaws.com/panalipolifod/zizivivil.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fe677114-b074-449d-804b-67b760430f93/line_6_spider_v_30_settings.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f5362c4a-e042-4ca3-a864-c50cc1085e0a/bretonnian_blood_bowl_team_miniatures.pdfIn PDF document text
    • https://s3.amazonaws.com/wizakokowe/jaruxugamujulixoxaxasom.pdfIn PDF document text
    • https://52ed6390-a5c1-4502-9f93-599cf6d98ad1.filesusr.com/ugd/f7fbc8_e0c6d2fa65644353bbfc54d3606dbb95.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/bb1ff2e5-db4a-4e69-80bf-ac0dac2e3f9a/brown_v._board_of_education_of_topeka_result.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_off0000f817.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF817 6432 bytes
SHA-256: 7a3a3ec112c0b40468fba0d623a78a3d0fb7c090b5fca18dfc1d26d6851c8114
font_01_sfnt_off00010e43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E43 4744 bytes
SHA-256: 3068e9bf0d625f7ae5d3c4db7e132cedbbdd0addf3abe81ad2f6b1328b565d43
font_02_sfnt_off00011e6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E6B 11584 bytes
SHA-256: 4ce0e9dcaf3e3be5ea27cb8acee54601dfed9a8cbf348b595273343f40c7a051