Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8f72db5041b5190…

MALICIOUS

PDF

72.9 KB Created: 2021-06-07 17:13:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: ec78f89ad426df4f43bbc3085d741070 SHA-1: 6af8c69f32f77730b25b23623ef96dc391591eac SHA-256: a8f72db5041b51906ee5e11cf34b659143e7e667f838f5d8feb381e4815c5237
194 Risk Score

Malware Insights

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

This PDF file exhibits characteristics of a phishing or malware distribution lure, as indicated by the 'PDF_SEO_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristics. It contains numerous external links, including one to 'https://nomylo.ru/pbw?utm_term=is+there+help+for+landlords+during+covid+19', suggesting an attempt to redirect users to potentially malicious content. The ML classifier and ClamAV detection further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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=is+there+help+for+landlords+during+covid+19 PDF link annotation
    • https://rokawutavepuma.weebly.com/uploads/1/3/0/7/130776645/7863555.pdfIn PDF document text
    • https://pibubalawuna.weebly.com/uploads/1/3/4/3/134316337/lejemime.pdfIn PDF document text
    • https://butavuzi.weebly.com/uploads/1/3/2/6/132682386/6d44c0656b30.pdfIn PDF document text
    • https://wisizexabebaj.weebly.com/uploads/1/3/4/4/134461468/2870160.pdfIn PDF document text
    • https://pigukoziluluz.weebly.com/uploads/1/3/4/8/134896600/9271788.pdfIn PDF document text
    • https://tiwebusimevadeb.weebly.com/uploads/1/3/5/3/135346158/506f5ced1870b4.pdfIn PDF document text
    • https://fexolemigelewi.weebly.com/uploads/1/3/4/2/134235379/bukozifefedoj.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/58a04bd8-e5a2-4586-9b85-1fe449c56316/megitibadagivuvas.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1b7cfd75-2319-47ef-b670-2200003deeed/jutej.pdfIn PDF document text
    • http://sujagajo.pbworks.com/f/what_is_dr_berg_diet.pdfIn PDF document text
    • http://pinurakus.pbworks.com/f/naming_compounds_containing_polyatomic_ions_worksheet_answers.pdfIn PDF document text
    • http://jitijaloj.pbworks.com/f/saat_samundar_dj_remix_mp3_song_free_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e32474a4-06ea-4832-ba5d-aa15e7f0cb69/ford_3000_tractor_parts_manual.pdfIn PDF document text
    • http://fixulirulafa.pbworks.com/w/file/fetch/144492288/what_is_the_icd_10_code_for_trauma_history.pdfIn PDF document text
    • http://dawanitapix.pbworks.com/w/file/fetch/144651006/zuzatile.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/894f013d-4312-4eb0-b69f-df8e3d4cdf4b/57073614906.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9196f0f9-c491-4847-a4a1-43c08a537e0d/devils_bible_documentary.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5163ffa6-dc59-4835-b38a-1cd404fbc2a8/43557727957.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c10107f1-b98b-41c0-9a1f-0765e3e42679/29892118214.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6432d761-f537-485f-9efc-1a95dcd93658/livro_patriarcas_e_profetas_em_audio.pdfIn PDF document text
    • http://ziduzobif.pbworks.com/w/file/fetch/144436347/twilight_saga_2008_tamil_dubbed_movie_download_tamilrockers.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_off0000e040.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE040 5620 bytes
SHA-256: f4663da564a15e3d028191542df99f7f4d459387ba03859b4fc10b68f8cb0f83
font_01_sfnt_off0000f368.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF368 10204 bytes
SHA-256: 517bfe320d53574c84c8b145637631f0b634351c618969144c2ca49c82260fc5