Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae408712ffb310fb…

MALICIOUS

PDF

85.4 KB Created: 2021-03-20 20:43:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 33683b429142793658875babbfb7f230 SHA-1: 1ce6147e2b3622a18c72f0534a2e7c64c0a14c70 SHA-256: ae408712ffb310fb6e42fe7a6dfe202619e9ca9deb1afa91c507b051756304b7
126 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. It contains numerous embedded URLs, many pointing to disposable hosting, suggesting a link farm or phishing lure. The document body, though heavily corrupted, contains fragments related to 'sd card read only' and 'wkhtmltopdf', possibly as a pretext to direct users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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/123?utm_term=sd+card+read+only+cannot+format+linux PDF link annotation
    • http://pasiworuwiwoz.getenjoyment.net/pdf_bestanden_samenvoegen_voorvertoning.pdfIn PDF document text
    • http://baxusajatos.sportsontheweb.net/25209293267.pdfIn PDF document text
    • http://oblakova.ru/whirlpool_gold_french_door_bottom_freezer_problemsizb5o.pdfIn PDF document text
    • http://shortsomfj.space/61277976672nj4du.pdfIn PDF document text
    • https://cdn.sqhk.co/devisofage/Rrgchhh/labyrinth_definition_catholic.pdfIn PDF document text
    • https://zokesafan.weebly.com/uploads/1/3/0/7/130775675/rudoxo.pdfIn PDF document text
    • https://xosulokut.weebly.com/uploads/1/3/4/4/134466674/xefagesum-gumuroki-dumal-rodoxunixuj.pdfIn PDF document text
    • https://nakigere.weebly.com/uploads/1/3/4/6/134608851/savaviz_sozopunikigure_nenonapire.pdfIn PDF document text
    • http://vorecan.space/4_pics_1_word_level_2142_answerxfkl3.pdfIn PDF document text
    • http://2220202.ru/planar_handbook_3.5_downloadevn6g.pdfIn PDF document text
    • https://jekosupoma.weebly.com/uploads/1/3/1/6/131637113/7671990.pdfIn PDF document text
    • http://kozidozilujivox.getenjoyment.net/41196273253.pdfIn PDF document text
    • https://cdn.sqhk.co/zefafulolit/hfjciby/international_business_analyst_salary_in_canada.pdfIn PDF document text
    • https://cdn.sqhk.co/lijumifi/N8hjhbX/five_senses_worksheets_for_grade_1.pdfIn PDF document text
    • http://bagadiwep.22web.org/black_boy_novel_book_review.pdfIn PDF document text
    • http://creditscorehelp.info/import_powerpoint_to_keynote_ipady5dho.pdfIn PDF document text
    • https://gabodubelekopo.weebly.com/uploads/1/3/4/3/134356924/namotevuwofat.pdfIn PDF document text
    • https://cdn.sqhk.co/gimexigerub/jfLijpz/7728024103.pdfIn PDF document text
    • http://vykupavto54.ru/dofuninazokejudesegived7mtch.pdfIn PDF document text
    • http://leqqurint.online/430341532386dzzv.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://dimarujevetuvif.epizy.com/82205539931.pdfIn PDF document text
    • http://diremize.epizy.com/tree_of_life_armband_tattoo.pdfIn PDF document text
    • http://bukijujer.rf.gd/hamilton_beach_flexbrew_thermal_carafe.pdfIn PDF document text
    • http://gukasitaxe.epizy.com/49137517895.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_off00010d1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D1B 5260 bytes
SHA-256: 2290c6431f5bb10c71aa34aa1be7777a33fa45f7ce519c8e797c80c089035a4e
font_01_sfnt_off00011efc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EFC 11912 bytes
SHA-256: 653f4cb6419fbdbf6cde4046faece46659c03db819aa845d629e6d75492d9c7d

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