Malicious PDF — malware analysis report

Static analysis result for SHA-256 32ea0ea5125f1099…

MALICIOUS

PDF

88.8 KB Created: 2021-03-17 01:53:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: eba4f7a80a664a8836afa7bd16a71262 SHA-1: 0a0e7dc92b16caa2277a0d90c6aa05b944469451 SHA-256: 32ea0ea5125f109958eff35718f936ccaa3ac138eff58c83a89d7a7bbca2b80f
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document is part of a link farm designed to redirect users, and an external URI points to 'kuzutuzo.ru'. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://kuzutuzo.ru/strik?utm_term=verbos+en+ingles+regulares+e+irregulares+y+su+significado PDF link annotation
    • http://suvolupijiro.mygamesonline.org/rerupojob.pdfIn PDF document text
    • http://sevezor.scienceontheweb.net/pudukiziju.pdfIn PDF document text
    • http://mutujejeturuduf.medianewsonline.com/candle_trading_strategy.pdfIn PDF document text
    • http://dawezedelofeda.scienceontheweb.net/pdf_docs_failed_to_apply_redactions.pdfIn PDF document text
    • http://rasezatoxefu.mygamesonline.org/home_security_cameras_with_iphone_apps.pdfIn PDF document text
    • http://dalidusiz.mywebcommunity.org/a_court_of_mist_and_fury_age_rating.pdfIn PDF document text
    • http://kogutojoveso.mywebcommunity.org/zerebamukafan.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/cef98b41-748a-4278-bd6b-407b973ddee7/33942668630.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7fe7981a-539e-4bd6-9206-169fb34ff722/8549015005.pdfIn PDF document text
    • http://davirokonal.epizy.com/what_is_company_culture_and_how_do_you_change_it.pdfIn PDF document text
    • http://rubabup.epizy.com/bahubali_2_tamil_movie_720p.pdfIn PDF document text
    • http://dufojamimusim.atwebpages.com/how_to_chart_weight_loss.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/26ec5be7-fa59-46fe-b9a7-100083f841f6/73642031075.pdfIn PDF document text
    • http://tuminexozuvino.atwebpages.com/matlab_multivariate_normal_distribution.pdfIn PDF document text
    • http://kojuvurapamox.myartsonline.com/super_systems_oven.pdfIn PDF document text
    • http://limoxukuk.atwebpages.com/78291924471.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b5045dec-4f20-459b-9f31-b03bd4494a5e/1976_70_hp_johnson_wiring_diagram.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2481333c-ccc1-4549-9448-c0a458e39827/titubogisebuvadetexirar.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6189ad09-abe0-4668-a1e8-4b9040dc4729/88651264168.pdfIn PDF document text
    • http://robosawubu.epizy.com/62880013182.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ae2b6c15-bc16-4e1d-a2b9-61a67e26417f/72648960815.pdfIn PDF document text
    • http://mafujerodise.epizy.com/programa_bautismal_lds.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001065e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1065E 5396 bytes
SHA-256: abcb549fc6942721a34042f539cf03d4fade5ea7ba296cb37857c927286abfca
font_01_sfnt_off000118cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118CF 11360 bytes
SHA-256: cba3788dc64d4cbe6dec475aa069b5bd5d808c64bb799d69fc31a515c9ef571b
font_02_sfnt_off00013e07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E07 16096 bytes
SHA-256: 3a87a2a80cb0740ff7ad33dbd9b35031d90241dfccc5ab96a3d2c3133af9c3ca