Malicious PDF — malware analysis report

Static analysis result for SHA-256 98be692802333c32…

MALICIOUS

PDF

78.6 KB Created: 2021-02-20 14:26:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 5c8c79f9e0b759b8a34b792432553330 SHA-1: e0b1263f1d6094be3b4f8344df0e91b2e11ee28a SHA-256: 98be692802333c324963941eecf5137032ca1d1245e6c26f5fe790ddd1fabd62
86 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF document contains numerous embedded URLs pointing to disposable domains, indicative of a link farm used for phishing or malware distribution. The 'SE_CALLBACK_LURE' heuristic strongly suggests a callback phishing attempt, where the user is prompted to call a number. While no scripts were directly extracted, the ML classifier and the nature of the URLs point towards malicious intent, likely to exploit the user through social engineering.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://baarspo.ru/123?utm_term=ps+vita+portable+charger+specs PDF link annotation
    • http://ru-dev.xyz/trimble_gps_controller6g6lr.pdfIn PDF document text
    • http://bandalet.club/employee_attendance_sheet_excel_formatijcau.pdfIn PDF document text
    • http://zahlungsservice-ch.site/lanelelumifu5hvoh.pdfIn PDF document text
    • https://cdn.sqhk.co/jiwosowo/oEchhgc/niligazugaw.pdfIn PDF document text
    • http://tuimag.ru/fusoxidareki661t6.pdfIn PDF document text
    • http://repair-planshetov.ru/81294381781ibd4.pdfIn PDF document text
    • https://cdn.sqhk.co/pigexebobe/aiffhbX/guess_the_movie_names_using_pictures.pdfIn PDF document text
    • http://keepmaxi.space/adobe_premiere_2015_trke_yamazfofe.pdfIn PDF document text
    • http://ccckkkkk.space/40225725469rcrkt.pdfIn PDF document text
    • http://mishgen.com/18958788954z9fke.pdfIn PDF document text
    • http://naturaitalia.space/sewefiwugaregufew0zgn7.pdfIn PDF document text
    • http://telemprom.xyz/mopetovapijigogprbnw.pdfIn PDF document text
    • https://cdn.sqhk.co/mamevugixej/eVauepJ/greatest_hits_radio_manchester_cash_register.pdfIn PDF document text
    • http://goodxday.xyz/40988304189t8nf3.pdfIn PDF document text
    • http://limons.space/iyonlama_enerjisi_grafik_sorularjvvk2.pdfIn PDF document text
    • https://cdn.sqhk.co/wemorapi/XUghxgf/barbecue_ribs_recipe_crock_pot.pdfIn PDF document text
    • http://detonic-ordina.website/nox_app_player_android_emulator_portablerak95.pdfIn PDF document text
    • https://cdn.sqhk.co/kominepoli/hddSXGe/murad.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/xamapebonijos/chromeleon_6._8_software.pdfIn PDF document text
    • https://s3.amazonaws.com/muvevanepen/space_odyssey_2010.pdfIn PDF document text
    • https://s3.amazonaws.com/bejenosugede/nadanab.pdfIn PDF document text
    • https://s3.amazonaws.com/sivanira/sqlite_auto_generated_id_in_android.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_off0000f6be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6BE 5396 bytes
SHA-256: e03f474a354d292c06334597cbcce9b3dbf84c36398f016f61adfdc74fd2365a
font_01_sfnt_off00010918.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10918 10776 bytes
SHA-256: 731f1c6530409194a4c0988f5b7e7771be87d7a0f978df8478b96c18debcb72b

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