Malicious PDF — malware analysis report

Static analysis result for SHA-256 f51b80e734dad3c4…

MALICIOUS

PDF

176.9 KB Created: 2021-03-20 20:36:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: ab4a0bf9dc8149652f4243b5276f775c SHA-1: 5ed4863df602559f8bebb763b64aefc14940287e SHA-256: f51b80e734dad3c46ac995634a153567cb7470b42c2de101ddc3b84b30515efc
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious. It contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm designed to redirect users to potentially harmful content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly indicates this malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://pelibifir.ru/wix?keyword=hitachiin+twins+height PDF link annotation
    • http://tk-time.site/gopro_hero_5_black_quick_guideucuhg.pdfIn PDF document text
    • http://dowakofevumamol.22web.org/rukakew.pdfIn PDF document text
    • http://trydouche.xyz/lean_six_sigma_certification_online_universityysa82.pdfIn PDF document text
    • http://sezewadiwun.22web.org/holcim_philippines_annual_report.pdfIn PDF document text
    • http://study-english-04.space/how_do_you_charge_the_jlab_wireless_earbudsf8vy5.pdfIn PDF document text
    • http://sendgrid-de.com/what_is_the_best_char_broil_grillqhxh5.pdfIn PDF document text
    • http://dovamemowiruz.iblogger.org/wipofukep.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/d35995a8-65bc-459d-a9fe-4c032942521c/65807704766.pdfIn PDF document text
    • http://xujalupa.epizy.com/voltage_transformer_converter.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5975215e-c173-4334-a031-185c6d1a6da1/how_to_set_time_on_timex_marathon_wr50m.pdfIn PDF document text
    • http://marobow.epizy.com/definition_of_criminal_justice_system.pdfIn PDF document text
    • http://valopuloti.rf.gd/leicestershire_police_incident_report.pdfIn PDF document text
    • http://safivobuvap.epizy.com/mokamojisi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d19e694f-e5cc-45bd-a4f7-c38fa1ed32f5/mijiwizabepomizexadumefu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5823ed43-1080-4a47-b864-9a5fd92d08b4/how_to_plot_a_run_on_map_my_run.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fc97612c-4cbb-48a8-a288-8d9816d42a1c/can_yoga_cure_anxiety.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0fdae518-d838-4b8c-9c6d-0e208028dfed/91777917877.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e73638d6-06b4-4a8f-b64a-c064c1f8f5df/bowomojameven.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/071d6473-3850-4906-8411-ae86a67058ef/can_you_get_fallout_new_vegas_dlc_on_xbox_one.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/85a56813-87ec-4388-a0a8-68d753fb2b5b/75791014998.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4682e137-a843-42ac-b6de-3c27d469e99a/graco_nautilus_3-in-1_car_seat_crotch_strap_adjustment.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_off0001fcb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1FCB9 41996 bytes
SHA-256: b5bb5dfebec48a5e35de0bf490fc11013fecd06fbe5d997499fa486723f1be4d
font_01_sfnt_off00027d39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x27D39 4988 bytes
SHA-256: 97bd279f9f3949afecf08ebf3314955951d439f7a4161d55d50d6f7914ca1333
font_02_sfnt_off00028e44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x28E44 12036 bytes
SHA-256: 44da1dbac3efc651a814342fc8e6a1f15dd2ad2fc621a5e3f19ed80d9a5ffa47

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