Malicious PDF — malware analysis report

Static analysis result for SHA-256 12659e2dcdd753f0…

MALICIOUS

PDF

72.7 KB Created: 2021-02-09 16:14:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 670ae413560dda1e85d410ebf61640b6 SHA-1: 0d3c4b57e8fe40f096a4ee6f55676f6447e6258e SHA-256: 12659e2dcdd753f0881e8c464107c43179977eaad6c93fb9e9df4ab6fc09ec3b
126 Risk Score

Malware Insights

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

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URLs, suggesting it functions as a link farm or phishing lure. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this, indicating the PDF is designed to redirect users to potentially harmful websites.

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://leonvi.ru/123?utm_term=the+case+for+christ+free+study+guide PDF link annotation
    • https://cdn.sqhk.co/kisesawaropo/hfgchfv/star_wars_theme_ringtone_iphone.pdfIn PDF document text
    • http://hermidkovo.info/xisikis5yzos.pdfIn PDF document text
    • http://xexogafuko.22web.org/dp_pic_whatsapp_girl_attitude_shayari.pdfIn PDF document text
    • https://cdn.sqhk.co/zarifabidit/Laja4ie/3287683693.pdfIn PDF document text
    • http://netewe9.xyz/baaghi_2_movie_full_hd_movies922dr.pdfIn PDF document text
    • https://cdn.sqhk.co/feluxolid/y6x0cjj/past_present_future_tense_verb_chart.pdfIn PDF document text
    • http://zebrait.fun/ballet_class_music0pxwq.pdfIn PDF document text
    • https://cdn.sqhk.co/tigadikem/ItheiiM/30534156042.pdfIn PDF document text
    • http://hookup756.fun/calculating_intake_and_output_worksheet_answersl1741.pdfIn PDF document text
    • http://banquepopulaire-fr.org/emerson_tv_owners_manualsya36.pdfIn PDF document text
    • http://tukebifivimix.iblogger.org/conquest_of_paradise_piano_sheet.pdfIn PDF document text
    • http://meriline.store/chess_rush_positioning_guide70h1l.pdfIn PDF document text
    • http://optarfes.com/38013572681ketpn.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gobavaduxa.epizy.com/90524116306.pdfIn PDF document text
    • http://lilivuxaja.rf.gd/round_one_youngblood_brass_band_sheet_music.pdfIn PDF document text
    • http://kezaforow.epizy.com/tabla_del_nmp_para_coliformes_en_alimentos.pdfIn PDF document text
    • http://gavojomizam.epizy.com/nysed_mandated_reporter_training.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_off0000ded8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDED8 5300 bytes
SHA-256: b39368b582af7b6891a1f237fcc593d1bad43eb2f5b481ec5614452342e2ab2f
font_01_sfnt_off0000f0e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0E5 10668 bytes
SHA-256: a54591685c21d611fdacd78dc0fc3c77577dd18e152cf623fa7469f674f44725

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