Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2609ab072ae8ae7…

MALICIOUS

PDF

86.2 KB Created: 2021-03-15 08:05:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 2afddcc8c27b68e515b17f52d16a600e SHA-1: d005b627d240d33cbcb21f123fc6674612a38130 SHA-256: a2609ab072ae8ae779566a9b08d56bcc21953312fe7863cfb0aa84b9f8a1ad52
186 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as a link farm designed to redirect users to potentially malicious websites. The presence of numerous external links, including one pointing to 'dugedepap.ru', suggests an attempt to distribute malware or conduct phishing. The ML classifier and ClamAV detection further support its malicious nature. No scripts were extracted, but the PDF structure itself facilitates the attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 6

  • 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.
  • 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://dugedepap.ru/123?utm_term=important+days+pdf++for+tnpsc PDF link annotation
    • https://kojemugolipoxo.weebly.com/uploads/1/3/4/7/134729864/6331701.pdfIn PDF document text
    • https://renixopofofof.weebly.com/uploads/1/3/4/4/134486295/sawobapesiga.pdfIn PDF document text
    • https://babibogek.weebly.com/uploads/1/3/1/3/131379554/2fee29f18182c7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490251/normal_5fd7dfb84af35.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4477181/normal_5fc9560c8edf9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403118/normal_6008bf6751c9e.pdfIn PDF document text
    • https://bizotimugir.weebly.com/uploads/1/3/1/1/131164076/c9e7a2668cd73.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • https://uploads.strikinglycdn.com/files/30153989-1820-451b-a6e8-da3f728a810b/how_to_fit_overhead_door_closer.pdfIn PDF document text
    • https://s3.amazonaws.com/lowebemuwojiso/platform_9_3_4_ticket_photoshop.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6f8fd8cf-3b08-4d64-a8b2-80c85a147b2f/1400_calorie_vegan_meal_plan_for_weight_loss.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/428c0ea9-1960-4353-a1a0-c6d2a552c043/c_and_c_tutorial_for_beginners.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/11278528-8069-4fdf-9469-cc715488482b/48697839103.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ddd50128-c3a9-4dce-9410-a92445c2eff3/60993816592.pdfIn PDF document text
    • https://s3.amazonaws.com/dusined/aliens_vs_predator_3_full_movie.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/54346dde-3953-4087-8471-119a3915cdb7/orange_jumping_spider_california.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3753b65c-0051-4bbd-878d-59dbf1a22705/michael_jackson_free_willy_song_lyrics.pdfIn PDF document text
    • https://s3.amazonaws.com/jinabom/microbiology_vs_molecular_biology_vs_biochemistry.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/63161be4-8058-420b-adaa-a8fd8e231077/gizopuvugobedogi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/10953b20-576d-4e26-8817-69410ce46485/the_animator_survival_kit_richard_williams_espaol.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b240460f-ceff-4e24-b106-12c447be4b53/xufama.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fbdc348b-4d11-4b67-910d-2d9985d6277c/samsung_un55ju6700_specs.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/578127b9-1939-45e7-93ef-92e07241aff2/muwegigofenupasuno.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010459.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10459 5308 bytes
SHA-256: a8df80d8e1254de032f8bbcd85112f23fa51a63b70e4a63b29a5bd1b884c7f75
font_01_sfnt_off00011657.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11657 3404 bytes
SHA-256: 5ffe6e0664808586ab4e727d55193dced40ee9f8f8d12031227462f1c735a34b
font_02_sfnt_off0001233f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1233F 11708 bytes
SHA-256: 3c1d36ecf7c83b53d5c17f5b5b336873cfee3e7e06935d1756780f32cebe7eb5

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