Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f067c49b9fd5d43…

MALICIOUS

PDF

73.7 KB Created: 2021-05-03 21:42:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: 29d63b314205121741dcb99e100c9ffb SHA-1: 9288a30edd38efb04011bc6cf2bb36953d42befe SHA-256: 8f067c49b9fd5d4388cd98952f3649a48b0396960c757eaacb657267d71d2972
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable hosting and are likely part of a link farm designed to obscure the final malicious destination. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the presence of a URL leading to 'baarspo.ru' strongly suggest a phishing or malware distribution attempt. The ML classifier and ClamAV detection further confirm the malicious nature of the file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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 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://baarspo.ru/strik?utm_term=chapter+8+section+2+chemistry+answers PDF link annotation
    • http://bafedudovodamo.medianewsonline.com/68065989691.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417025/normal_602a0181a0457.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4401972/normal_602b73b56fabd.pdfIn PDF document text
    • http://larijasetejupaz.mypressonline.com/dell_poweredge_r740_manual.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486984/normal_6050625140210.pdfIn PDF document text
    • http://comforfemj.fun/hobbs_and_shaw_parents_guideclp2d.pdfIn PDF document text
    • http://itanto.space/el_diario_de_motocicleta_streamingw0t4f.pdfIn PDF document text
    • http://gratoraama.website/western_romance_books_to_read_online_for_freeaq8wc.pdfIn PDF document text
    • http://extraterrestrials.space/thinking_maps_trainingtd037.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/tazopaju/bed_frame_woodworking_plans.pdfIn PDF document text
    • https://7be8961d-effb-4c78-a255-78c3c9f0be09.filesusr.com/ugd/3dd68e_c1e152f2daae4f73a458c0f1c6c1014a.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/c8d03eaf-a3db-4263-82ef-74dd0a1d4f92/guardian_ultra_source_15_000_watt_electric_start_generator_parts.pdfIn PDF document text
    • http://vipuzala.myartsonline.com/handbook_of_ecological_economics.pdfIn PDF document text
    • https://s3.amazonaws.com/mejigavukolu/3197840874.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/71f64525-7cb6-4a0f-add3-f1fb7fc14131/mijukasogamad.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cd15bb96-fb36-49d4-921f-6491e598c579/besumosaxonokereduvat.pdfIn PDF document text
    • https://s3.amazonaws.com/tokudapele/astm_a106_gr_c.pdfIn PDF document text
    • https://77483064-5892-4b52-b419-66e751946b77.filesusr.com/ugd/ef7b09_f56ccdef13dc40499c1647b8586b2616.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/susonanezaj/acknowledgement_for_seminar_report.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0b98b6c8-fef1-478b-8004-cee1f68eb175/85751030586.pdfIn PDF document text
    • https://acda325f-ee3b-40e4-882f-fabc489a6840.filesusr.com/ugd/23b3d3_e858aa8aebe34a46920d2e2fcfddc2d1.pdf?index=trueIn PDF document text
    • https://161abad2-7de2-49bb-9904-d6e2a620a662.filesusr.com/ugd/2eec94_8c37510493364aa4ae237d5ba16424b4.pdf?index=trueIn PDF document text
    • https://d934ed86-632c-4751-b35b-4303166f997e.filesusr.com/ugd/be0f55_3f91abe936dc47f0aeec0e92f8948b84.pdf?index=trueIn 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_off0000e0a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0A0 5568 bytes
SHA-256: 7572dfb3a9401d88d2158a81a94b6d277d2bf2768425e8de8d8e6052225f90e1
font_01_sfnt_off0000f373.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF373 11148 bytes
SHA-256: 58bb9c2861ddba4e28413dd363ee1af856bacac7db5b83b665973479ae3306c1