Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b51dc60c9dbf39d…

MALICIOUS

PDF

86.4 KB Created: 2021-03-14 19:47:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 8b7f8bfd53016bc0749329e82146cf45 SHA-1: af77347a1e72ff30d6baab0cec8c73c306c29985 SHA-256: 5b51dc60c9dbf39dc70180d7c353ac4348a50b6df9feeceb02548933f7964cdf
186 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm or SEO spam operation. The primary malicious URL identified is https://midufefew.ru/award?keyword=canon+in+d+major+piano+partitura+pdf, which is likely used to redirect users to further malicious content or phishing pages. No scripts were extracted, but the PDF structure and link farm characteristics strongly indicate a malicious intent to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://midufefew.ru/award?keyword=canon+in+d+major+piano+partitura+pdf PDF link annotation
    • https://cdn.sqhk.co/xovikojux/ijjhb0D/king_herod_death_date.pdfIn PDF document text
    • https://cdn.sqhk.co/vanatuwo/agfggjh/download_game_flip_diving_cheat.pdfIn PDF document text
    • https://cdn.sqhk.co/mudemodox/hfGhiTY/rosonovile.pdfIn PDF document text
    • https://cdn.sqhk.co/gixelotopa/xhjheE5/jesobonejubeg.pdfIn PDF document text
    • https://cdn.sqhk.co/zisazege/hgdgjgi/60632301699.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/e67dfb5d-6999-4630-81d3-d3a7fdc1d980/what_to_look_for_when_buying_a_second_hand_hybrid_car.pdfIn PDF document text
    • https://979cd01f-16ea-4d2c-b189-234964c95597.filesusr.com/ugd/d4c4cf_4f2369f800ee4670927c7629cedb3ea4.pdf?index=trueIn PDF document text
    • http://rizexabidi.rf.gd/chota_bheem_cartoon_movies_in_tamil.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4330e58f-5986-41e7-bc0a-ebbb3240837c/oregon_scientific_wireless_temperature_sensor_thn132n_oem.pdfIn PDF document text
    • http://zuvaxazalafes.epizy.com/movies_free_online_without_signing_up.pdfIn PDF document text
    • https://54e283d8-6946-47af-b6e3-c78582312647.filesusr.com/ugd/22cd47_e9a2a852421e435e856b9cd6d9ed055a.pdf?index=trueIn PDF document text
    • http://bavidoripo.epizy.com/34266510275.pdfIn PDF document text
    • https://eee5dff6-7331-416e-acdf-593d0c386862.filesusr.com/ugd/21e9e0_b19bbc1f52c346e4ab888f3df4d0163d.pdf?index=trueIn PDF document text
    • https://32e47638-7206-44c1-ad53-5c6f9176402e.filesusr.com/ugd/e00742_c004a98e93b246198d7f34aba71c5aa6.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/157f5946-7a0a-41be-a8d4-9168580bd582/descargar_libro_de_geometria_analitica_de_lehmann_gratis.pdfIn PDF document text
    • https://67bb8873-ca08-4da4-87c0-60a8072ebff6.filesusr.com/ugd/a838c0_20e3858fbd254fb1bb16bb41cabdbfea.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/e9eb47ca-e543-4a4c-94ce-c98adf3f8c9e/what_is_the_setting_of_the_story_the_monkeys_paw.pdfIn PDF document text
    • https://ff9dba89-6132-4485-99c2-ace8a2453124.filesusr.com/ugd/c3f59f_1e033c7e1d2149faa1e5c4199aae5bcf.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/ec3f33bb-7f35-4f24-9f97-4116b58e8faf/95716221777.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/50c066a4-4d32-4629-b4bb-2008472268e1/humax_remote_control_code_for_sony_tv.pdfIn PDF document text
    • https://dae57379-2785-4108-a223-4562ecbfc22e.filesusr.com/ugd/87ad98_904f36ecbd604ed3a6bdd90632c50d1e.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/b97b2df2-70f0-48f3-8588-8a2dbe55883c/85821695288.pdfIn PDF document text
    • http://sobegomogi.rf.gd/amelie_sheet_music_yann_tiersen.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fcb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCB3 4960 bytes
SHA-256: 9fdd9bb342e505de97ca0de282fbf43f0d3f95610caf8464886203de4d4a105d
font_01_sfnt_off00010d7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D7A 11960 bytes
SHA-256: b57d86002597c0e9d6ad5b1a74693ed183c21194635d36d4ebf0f4cad0c1a6a6
font_02_sfnt_off00013679.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13679 16184 bytes
SHA-256: 99308d2943c7867383f38f1c211846cc6735cce0880ded375eef66ea4f3e2d8c