Malicious PDF — malware analysis report

Static analysis result for SHA-256 5804f7ab2abebbdd…

MALICIOUS

PDF

79.3 KB Created: 2021-04-23 08:40:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: ca8917a222842285856208cba1b22d98 SHA-1: 6bf3c6a5a3f3e70db219a028db031e19331a53e4 SHA-256: 5804f7ab2abebbdd72768bfa988b1e975961bf880b4721196e8780628717d5b4
126 Risk Score

Malware Insights

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

The PDF file contains an embedded URL that redirects to a suspicious domain, identified by heuristics as a link farm and flagged by ML classifiers and ClamAV as malicious. The document body, though heavily obfuscated, appears to be a lure related to car battery issues, aiming to trick users into clicking the malicious link. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://vilenefex.ru/strik?utm_term=why+is+my+battery+light+blinking+in+my+car PDF link annotation
    • http://kunujunekedi.mygamesonline.org/movimiento_circular_uniforme_y_variado.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409244/normal_6030dd82aabc0.pdfIn PDF document text
    • https://milonotupilo.weebly.com/uploads/1/3/5/3/135347339/d61050711902.pdfIn PDF document text
    • http://mudikovarew.mygamesonline.org/revit_architecture_residential_house_design.pdfIn PDF document text
    • https://belafawejogawol.weebly.com/uploads/1/3/4/5/134583754/biriwamid.pdfIn PDF document text
    • http://matorebaxemipiv.22web.org/what_are_the_principles_of_game_theory.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446287/normal_5fe7b5202039f.pdfIn PDF document text
    • http://kesosobozu.iblogger.org/free_download_spoken_english_book_tamil.pdfIn PDF document text
    • https://wovorixikamaso.weebly.com/uploads/1/3/1/3/131378932/3044254.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4455902/normal_6007a9aadc0e0.pdfIn PDF document text
    • http://jolovomolosubi.getenjoyment.net/ages_problems_in_telugu.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/bulalowisu/jupawigemenagixuburav.pdfIn PDF document text
    • http://gaxilitexu.onlinewebshop.net/enlace_polar_y_no_polar.pdfIn PDF document text
    • http://guridej.epizy.com/quantitative_research_data_analysis.pdfIn PDF document text
    • http://vujuvisesakok.myartsonline.com/46921892725.pdfIn PDF document text
    • https://s3.amazonaws.com/wulotugadag/31391519262.pdfIn PDF document text
    • https://6a8c8246-1d13-4591-bf48-fff7be43b8e4.filesusr.com/ugd/1fa6dd_2fb5dfbb9d034cdb853ef56ebb3d7753.pdf?index=trueIn PDF document text
    • http://ludujefu.epizy.com/sosirulelasogeded.pdfIn PDF document text
    • https://21319658-e817-4d6a-846f-872ccfe0f0c2.filesusr.com/ugd/982af2_c5977ad8e4a44239849ab4c824600976.pdf?index=trueIn PDF document text
    • https://55963656-6eb1-4b25-bcd5-bb835d65808b.filesusr.com/ugd/0064ae_07a873da1cf548fa9a949ebbef00c911.pdf?index=trueIn PDF document text
    • https://c93e3e17-565c-496b-95a0-45fea83b015f.filesusr.com/ugd/cd9bb8_e0d7348bb8b64dfdba8586225b3159dd.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/mefonevimimix/solving_quadratic_equations_by_factoring_independent_practice_worksheet_answer_key.pdfIn PDF document text
    • https://9d349da1-218b-4b59-9e37-2a90cab56d40.filesusr.com/ugd/de9003_4e02a46a07754897a600a23ef1be7c65.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jaloto/self_cert_form_sickness.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_off0000f846.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF846 5532 bytes
SHA-256: 1a5f4dfd703977c906a4c81dd6a595ce90a0f70a497d14d26d3f0e331560e7d8
font_01_sfnt_off00010b01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B01 10648 bytes
SHA-256: fbb67aedd8a172149d5c00281e614aaf10a598b870631dbc5405508336287f5f