Malicious PDF — malware analysis report

Static analysis result for SHA-256 d146eb07c51b9bc1…

MALICIOUS

PDF

79.4 KB Created: 2021-06-06 05:17:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: f515a7983b8082b5edc4d0a903d460d6 SHA-1: 563b07466fee8672b942b7787957eec285c4076d SHA-256: d146eb07c51b9bc19d7b1913b8166d133879539e62526792d871a07d94a590ec
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable hosting, suggesting a link farm or phishing operation. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://medvor.ru/pbw?utm_term=bolton+commercial+block+font+free+download PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4373522/normal_600fa79b02a44.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446931/normal_602428f008352.pdfIn PDF document text
    • https://velebipuzufal.weebly.com/uploads/1/3/4/4/134434208/ed4339545a7562.pdfIn PDF document text
    • https://fefodenajefive.weebly.com/uploads/1/3/1/4/131437461/8646627.pdfIn PDF document text
    • https://valakafugajebe.weebly.com/uploads/1/3/4/3/134330742/443c28c44f96b1.pdfIn PDF document text
    • https://wilalunawotepa.weebly.com/uploads/1/3/4/6/134608105/1380280.pdfIn PDF document text
    • https://mulafixi.weebly.com/uploads/1/3/4/3/134317856/759332.pdfIn PDF document text
    • https://pagiwidew.weebly.com/uploads/1/3/4/4/134498508/sakepaxa_zanomimof_senateno_lopawupibir.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420776/normal_60006742ae969.pdfIn PDF document text
    • https://kodejisejawap.weebly.com/uploads/1/3/2/3/132302923/8d25d437fa.pdfIn PDF document text
    • https://dozowogan.weebly.com/uploads/1/3/4/0/134098910/7063046.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/2f5bab7a-0813-4648-b6fd-847ce57a9910/which_of_the_following_is_not_an_example_of_nonverbal_communication.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/75f42d78-8050-4b47-b50d-bc9ffa8093ce/what_does_a_pre_purchase_car_inspection_consist_of.pdfIn PDF document text
    • http://vatojorisa.pbworks.com/f/where_are_the_rice_terraces_in_the_philippines.pdfIn PDF document text
    • http://saladolu.pbworks.com/w/file/fetch/144684213/what_are_the_areas_of_institutional_housekeeping.pdfIn PDF document text
    • http://jobagej.pbworks.com/f/zajujugadagazekow.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b63979ba-6071-43d5-acf1-13d39f952753/greek_and_latin_roots_worksheet.pdfIn PDF document text
    • http://siseraxoru.pbworks.com/w/file/fetch/144519462/run_and_gun_rimworld_mod_download.pdfIn PDF document text
    • http://zepupifob.pbworks.com/w/file/fetch/144426027/jeppesen_private_pilot_maneuvers_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f68ddf89-8774-4649-bd96-147d698a4292/maus_parte_1_y_2_espaol.pdfIn PDF document text
    • http://gatunam.pbworks.com/f/como_descargar_clash_royale_para_pc_windows_7.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_off0000e1f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1F1 5336 bytes
SHA-256: 47105a60afc8175573529d22ff80ed420768ae673a99169d36fdac8d726dc4c9
font_01_sfnt_off0000f412.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF412 11316 bytes
SHA-256: d2c7367d9de22fe3422332db896bae1fc77f9ecb3da1e053aeaff2de81391d11
font_02_sfnt_off00011a8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A8B 16144 bytes
SHA-256: f0a8b786da721c7415a59d91fbce3b20bbb98ea32e48857ac1ff22d53b00ec29