Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b7fb36fb102108f…

MALICIOUS

PDF

74.3 KB Created: 2021-03-23 03:45:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: ee16e25c8751bb4fff5e456fbd52456b SHA-1: ec99931cea1b4afafa7fbf39eda39de421836e56 SHA-256: 4b7fb36fb102108faad9b17ba3605d77ab521763685ccad16f07abbb572e0429
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to disposable domains and link farms, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are characteristic of malicious documents designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://druttle.ru/award?keyword=bitsat+exam+syllabus+pdf PDF link annotation
    • https://cdn.sqhk.co/xolanikipiz/Lgfjavc/6ix9ine_runner_pc.pdfIn PDF document text
    • https://nitetawowi.weebly.com/uploads/1/3/5/3/135301411/dowejupu.pdfIn PDF document text
    • http://reduslimitalia-official.site/how_to_reset_kenmore_elite_he3t_washer29ujb.pdfIn PDF document text
    • https://cdn.sqhk.co/banamasuvaj/emFhf3O/jamebawovomofiwosupe.pdfIn PDF document text
    • https://mutuwafidiz.weebly.com/uploads/1/3/6/0/136095616/7600593.pdfIn PDF document text
    • http://latuwuka.iblogger.org/13854854200.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475997/normal_60313526da39c.pdfIn PDF document text
    • https://cdn.sqhk.co/nadizolobe/azii5hh/stick_fight_shadow_warrior_apk_mod.pdfIn PDF document text
    • http://prodson.space/water_and_wastewater_engineering_davis_solution_manualvwryt.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455684/normal_60175c84bcad9.pdfIn PDF document text
    • https://cdn.sqhk.co/jitolado/jg5G5Dr/pentagon_federal_credit_union_login.pdfIn PDF document text
    • https://vafiradas.weebly.com/uploads/1/3/3/9/133988778/501700.pdfIn PDF document text
    • http://electorat.org/tai_chi_for_beginners_and_the_24_forms_dvd1evk1.pdfIn PDF document text
    • https://cdn.sqhk.co/bapulofuw/enSgiAC/76260099500.pdfIn PDF document text
    • http://save50.pro/40601658391oc7wy.pdfIn PDF document text
    • http://sweetygirl.club/problemas_optimizacion_selectividad_ccss6rn4z.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369174/normal_6007ac8881aca.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lipaxunuvevi.epizy.com/87050487194.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6a84a18a-ad93-40ae-9182-3f1416f9e30c/how_to_add_mp3_as_iphone_ringtone.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/80f98d26-f667-4512-915b-9f2a848ba838/94058051580.pdfIn PDF document text
    • http://jovawat.epizy.com/authentic_happiness_scale.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f33ddde4-b950-4751-9458-ab52f39309e1/tedivun.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_off0000e47f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE47F 5452 bytes
SHA-256: 3a368c20a3cba5af981d836b83b8e5cf46667f4ebd0e08ec5b0ac4801bc2c468
font_01_sfnt_off0000f708.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF708 10752 bytes
SHA-256: bddf11de61a85d58f4f80a58624480a70c3274775aad2c6654f43a3dfd149aaa

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