Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2166d4c152b9373…

MALICIOUS

PDF

72.2 KB Created: 2021-06-03 08:16:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 93769f40a60013b42f299c4056b4d5bf SHA-1: 216692eb2af7544e2b74123b9b869924a63b3393 SHA-256: a2166d4c152b93738b2326f90b5907f669c5c6557abc40aaa621d64e7c79b6dd
166 Risk Score

Malware Insights

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

The PDF contains an embedded URI pointing to a suspicious domain, identified as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate maliciousness, with the 'SE_PASSWORD_ARCHIVE_LURE' heuristic suggesting a common tactic to bypass gateway scanning. While no scripts were directly extracted, the overall structure and heuristics point towards a phishing or malware distribution attempt.

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://pixomot.ru/pbw?utm_term=tank+trouble+3+unblocked+66+at+school PDF link annotation
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/0baf9584-d3b2-4da1-80df-bc7dcae1c33c/what_does_culture_mean_to_you_in_the_workplace.pdfIn PDF document text
    • http://visetululiv.pbworks.com/w/file/fetch/144423102/fox_hills_stores.pdfIn PDF document text
    • http://zewalar.pbworks.com/w/file/fetch/144465876/35767056719.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/52444806-aff4-4cee-a0e7-8133adab680b/suburban_rv_furnace_parts_list.pdfIn PDF document text
    • http://vowujepojez.pbworks.com/f/7910108149.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f52b8178-aa49-4835-a2d8-0dd3c6c30ce4/wichita_kansas_arrest_records.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/019c1fb4-8e42-46cf-9ee7-c3d163ba678d/what_is_lean_management_in_healthcare.pdfIn PDF document text
    • http://pezaloribed.pbworks.com/f/mapa_politico_sudamerica_y_centroamerica.pdfIn PDF document text
    • http://paditoxef.pbworks.com/w/file/fetch/144488184/ice_age_3_full_movie_in_hindi_download_pagalmovies.pdfIn PDF document text
    • http://siruzosu.pbworks.com/f/41670936964.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/932a4519-b41a-4f30-b341-db60a56232d6/how_to_crochet_a_basic_beanie.pdfIn PDF document text
    • http://vifogajo.pbworks.com/w/file/fetch/144499296/how_to_write_an_email_to_client_asking_for_documents.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5ec66747-3880-4f9f-97b9-e48266b68ec4/kumon_kindergarten_worksheets.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d7677a93-6b0c-42f6-9e6a-84fe7527e884/dasad.pdfIn PDF document text
    • http://mikabipi.pbworks.com/f/tabla_de_equivalencias_de_unidades_del_sistema_internacional.pdfIn PDF document text
    • http://jujupaw.pbworks.com/f/books_removed_from_the_bible.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bc85b1b9-7852-45cc-99ca-314b1300ff0a/the_seventh_man_haruki_murakami_questions.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c6265d23-98b1-4ec9-b67b-eacb192a7178/31173023950.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3864de45-646b-4775-a7f3-1898807e9446/nutrition_taco_bell_chicken_quesadilla.pdfIn PDF document text
    • http://wuvebag.pbworks.com/f/un_decametro_cuadrado_cuantos_milimetros_cuadrados_tiene.pdfIn PDF document text
    • http://midevodimu.pbworks.com/f/62848401377.pdfIn PDF document text
    • http://wekibivu.pbworks.com/w/file/fetch/144458976/288994152.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_off0000de53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE53 5496 bytes
SHA-256: 8a9a11d6122cec524de96f84a74633ddda33512a3003e14eed5686005da05687
font_01_sfnt_off0000f0f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0F5 10004 bytes
SHA-256: 3220c284956e7c0a07781d3c0f244f05750b7ea18c29c9b6afb53a2f09222c0f