Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a4b2709a4cbd2a7…

MALICIOUS

PDF

76.4 KB Created: 2021-03-27 10:05:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 0f4bd5dcf78bc754662867ab7878159e SHA-1: ae0139e07259e10a353fa05f3123caec4b772d65 SHA-256: 0a4b2709a4cbd2a72aa4e6def45138e5ad624333056f7d28e30f6a5be1992ed4
126 Risk Score

Malware Insights

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

The sample is identified as malicious by ClamAV and an ML classifier, with heuristics indicating it functions as a link farm on disposable hosting. The embedded URLs, such as 'https://xezojetit.ru/award?keyword=catabolismo+de+los+carbohidratos+pdf' and 'http://unlockdeals.shop/kogitacxmmp.pdf', are likely used to redirect users to malicious sites. The document body, though heavily obfuscated, contains metadata suggesting it is a PDF related to carbohydrate metabolism, used as a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://xezojetit.ru/award?keyword=catabolismo+de+los+carbohidratos+pdf PDF link annotation
    • http://unlockdeals.shop/kogitacxmmp.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490516/normal_600aba656db72.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415518/normal_604647f262f9d.pdfIn PDF document text
    • http://salopkisa.website/lobby_design_in_houseo3zab.pdfIn PDF document text
    • http://zeretula.iblogger.org/feelings_wheel_poster.pdfIn PDF document text
    • http://evromotors.net/why_marx_was_right_summary02t8w.pdfIn PDF document text
    • http://tumuduwaju.mypressonline.com/princeton_review_sat_math_2_practice_test.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486051/normal_5fe309b29e2c1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410030/normal_603b5be61ef15.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4445341/normal_5fec7cc35fc3a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367959/normal_60430987063ed.pdfIn PDF document text
    • http://tamakedesununod.mywebcommunity.org/samsung_model_un32n5300afxza_remote_control.pdfIn PDF document text
    • http://changely.club/define_legal_nonconformityxl6bc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447265/normal_60216316e7984.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368954/normal_5fd2dbfa19748.pdfIn PDF document text
    • http://loneresel.mygamesonline.org/how_to_improve_guitar_speed_and_accuracy.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/povodijirig/new_sad_boy_whatsapp_status_video.pdfIn PDF document text
    • https://s3.amazonaws.com/gazivemon/weather_report_for_fairport_ny.pdfIn PDF document text
    • http://fibejebovef.epizy.com/fanuc_programming_language.pdfIn PDF document text
    • https://s3.amazonaws.com/rovikibixu/36163788065.pdfIn PDF document text
    • https://s3.amazonaws.com/rudelazifizuvo/48378340839.pdfIn PDF document text
    • http://mivonovemejited.epizy.com/battle_trip_seventeen_yogyakarta_kordramas.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_off0000eb15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB15 5440 bytes
SHA-256: 15b5533a2246e431b3564b396c75b18309904353f2913e24a41ff5a259de5a1b
font_01_sfnt_off0000fd59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD59 11404 bytes
SHA-256: cd45390fcf289fb2b5212181a6fcf46380e06738f64f140c9fb6facff572f54d

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