Malicious PDF — malware analysis report

Static analysis result for SHA-256 39e3b1f2087e5423…

MALICIOUS

PDF

74.0 KB Created: 2021-04-15 16:46:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 5c4751e8362fa5b23e20edc048815183 SHA-1: 23ac1e9ad2b148179a4af3bb3862659bb6738bb8 SHA-256: 39e3b1f2087e5423d1c316179d0e803a9246ad73abff856ca3ef5a6e207f0179
126 Risk Score

Malware Insights

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

The sample is a PDF file flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous embedded URLs, with one specifically identified as an external URI pointing to a suspicious domain ('lozipotod.ru'). The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the PDF is part of a link farm on disposable hosting, suggesting a phishing or spam campaign. No scripts were extracted, but the presence of external URIs and the overall heuristics strongly suggest a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://lozipotod.ru/strik?utm_term=html+style+tag+link+color PDF link annotation
    • https://cdn.sqhk.co/futevanu/f8cjbOa/dw_drum_set_price_in_sri_lanka.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384832/normal_606c176233270.pdfIn PDF document text
    • https://cdn.sqhk.co/gavezexu/xoEieOV/gmda_full_form.pdfIn PDF document text
    • https://cdn.sqhk.co/jifedibodo/hbjghbP/lenovo_moto_smart_assistant_android_app.pdfIn PDF document text
    • http://fortuneo.biz/endocrine_system_worksheet_middle_schoolsx28z.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409621/normal_606e6c12570b7.pdfIn PDF document text
    • http://helpcopyright-service.com/night_owl_dvrwharf.pdfIn PDF document text
    • https://cdn.sqhk.co/vivupedasez/sHieGie/strikeforce_kitty_last_stand_download.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403818/normal_605c41d3ed211.pdfIn PDF document text
    • http://modernstyle.pro/how_to_cook_hamburgers_on_the_cuisinart_griddlern8roj.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380869/normal_5ff0bb4e8cbd5.pdfIn PDF document text
    • http://lovewaits.ru/lixadadumuporemwgx0c.pdfIn PDF document text
    • http://shtangelkipokupkiitd.online/nintendo_ds_lite_release_date_priced90xi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465705/normal_5fcba67fc9c46.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/cbe6130c-3c26-446d-bdc8-574f7bdf9ad6/a_gas_in_a_piston-cylinder_assembly_undergoes_a_compression_process_for_which_the_relation.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a12a6602-bf0b-4939-bedb-8dbf847b7f2c/90704820643.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/37370bec-4ea3-44b8-ac55-74b7c66660a2/54416325582.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e114448b-8371-4e18-9fa6-706bd11eb38a/61291108768.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cd84264f-71b4-43be-aa2c-ce35adbfdbf4/vaxiripirutevitigi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/256f5ece-1753-4970-af78-4fc8dc68d637/wosepegegakekukazuwosezuz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/02534413-6e01-42a4-baed-f461385062a5/how_to_toast_new_england_hot_dog_buns.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/04836f1a-a194-4caf-b4fc-71739fa90833/adobe_premiere_pro_app_free_download_for_pc.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a26e5785-22d8-42ba-bb0d-9a925e90e497/manual_de_funciones_de_una_empresa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3b3ef7cc-5cb9-4964-9314-d24a7dcfd0ad/hp_designjet_500_driver_windows_8_64_bit_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/29081b81-0041-41c1-ab13-30a838164c65/17360371809.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2da26b42-5bd4-414f-9aba-736c4651393e/2006_lincoln_navigator_owners_manual.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_off0000e26e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE26E 5244 bytes
SHA-256: 40200ba9166a609d698f88718926c7f68cb4524a3531f1bf076814f9428e3e8d
font_01_sfnt_off0000f439.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF439 11320 bytes
SHA-256: 282368f58c64c445642f4ec614966159b4a9b8cc66bc841439fb0d7c3acdca58

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