Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7201e33cd1e036e…

MALICIOUS

PDF

78.1 KB Created: 2021-03-29 07:41:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: ce5fac8e04bcdb288b1144f046797460 SHA-1: 76a4e840a688d4bc70398d517b84f6c9dbd147e0 SHA-256: b7201e33cd1e036e840a194fc20c6a13122d350e3daee4ac42f070298d2a90d7
126 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. The document contains numerous embedded URLs, with one specifically pointing to 'nipisod.ru/strik' and appearing to be a lure related to AutoCAD performance issues. While no scripts were directly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://nipisod.ru/strik?utm_term=autocad+move+command+very+slow PDF link annotation
    • https://cdn.sqhk.co/letarezetap/2fjdugc/candomble_religion.pdfIn PDF document text
    • https://cdn.sqhk.co/detatakev/gWehnib/4761892391.pdfIn PDF document text
    • http://kopalomara.iblogger.org/aircraft_maintenance_engineer_resume.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445868/normal_603b77c0e167d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4473619/normal_5ff5ff254e57b.pdfIn PDF document text
    • http://nudiluderovemi.iblogger.org/boston_market_menu_prices_prime_rib.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nidusorigawofe.rf.gd/wuvonitepafamideb.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/96a6e96d-b5f5-4616-9717-8dc65b230f11/junovedifivek.pdfIn PDF document text
    • http://bibirosomuxir.epizy.com/identifying_relative_clauses_ks2_worksheet.pdfIn PDF document text
    • https://68420551-d949-41c4-975b-2ae86aa6d062.filesusr.com/ugd/09c3c7_298165a9fb684848bac8bdf0cbadb6c0.pdf?index=trueIn PDF document text
    • https://eb7ae0bc-69c2-4833-8adb-ed465737bb77.filesusr.com/ugd/23493e_1579e873eaef4bc39db642417d71bb1b.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/56bcd16a-167a-4658-ba3c-8af38aded77f/55332382008.pdfIn PDF document text
    • http://rutipozi.epizy.com/92034150946.pdfIn PDF document text
    • http://lotarikavim.rf.gd/misplaced_modifier_exercises_with_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6b7e0cc0-ecf0-47d3-9797-2c4d714166e1/amazon_program_manager_interview_questions_and_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/becbddf1-6a7e-4664-92ac-1c8d994d9953/98242438511.pdfIn PDF document text
    • http://gofirog.epizy.com/48429033402.pdfIn PDF document text
    • http://malejuvi.epizy.com/a_streetcar_named_desire_set_design.pdfIn PDF document text
    • https://204833c8-abda-4421-8777-5048ee7dd919.filesusr.com/ugd/e30b7a_5e5990e866df4ba3acca6b9f66c05ed3.pdf?index=trueIn PDF document text
    • https://52ed6390-a5c1-4502-9f93-599cf6d98ad1.filesusr.com/ugd/f7fbc8_9eb1ef06b4954c73b95f9525712d3122.pdf?index=trueIn 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_off0000e347.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE347 4032 bytes
SHA-256: 97c2b2e40c1385b4481fda1c9b3ae017bab0cd090847a61954886acf943b7a13
font_01_sfnt_off0000f1b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1B8 5328 bytes
SHA-256: 1fed804fc4c80b773f50d5532f3acf911f1414b865e147db15ec8ec515176ba3
font_02_sfnt_off000103da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103DA 11856 bytes
SHA-256: db29a9f2842c2163f3f1e1f9f94efa8b3be9dec88d733549fbac459c31092472

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