Malicious PDF — malware analysis report

Static analysis result for SHA-256 0170000a2e766ec6…

MALICIOUS

PDF

68.1 KB Created: 2021-02-15 12:15:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 306fd4d830201ca7ee6618ecc7ce213b SHA-1: b12a7993fd86e67916bb85258dde14a1983ccb91 SHA-256: 0170000a2e766ec6faa582691614e01b414eb8deda8127bc00e841f785a7cf6e
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs disguised as document content, with the primary heuristic indicating it's a link farm on disposable hosting. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were extracted, the PDF structure and numerous external links point towards a social engineering attack to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://jottigo.ru/strik?utm_term=acer+aspire+one+zg5+drivers+linux PDF link annotation
    • http://idealicacolumbia.site/bandook_chalegi_2_video_mein_mp46f2l0.pdfIn PDF document text
    • http://samettemiz.xyz/kondzilla_bum_bum_tam_tam_ringtonep2egc.pdfIn PDF document text
    • http://tehnotop.store/request_for_work_permit_letter_template7zxqm.pdfIn PDF document text
    • https://fakebomazeb.weebly.com/uploads/1/3/1/4/131453402/pelakufejubidutidu.pdfIn PDF document text
    • http://foodguideblog.com/rodurizuvadolizetor8n6d.pdfIn PDF document text
    • http://myluckybet.xyz/casio_exilim_np-80_battery_charger9o1g4.pdfIn PDF document text
    • https://kesizimi.weebly.com/uploads/1/3/1/3/131398366/47fd8b604.pdfIn PDF document text
    • http://virona.org/sinhala_adara_wadan_photosbu6n0.pdfIn PDF document text
    • http://7lessons.space/2793425878kbidz.pdfIn PDF document text
    • http://hook-up.fun/phng_vn_sacombank_bao_lu_th_c_kf6fle.pdfIn PDF document text
    • https://cdn.sqhk.co/jebumujo/92dVIFz/memorial_for_kobe_and_gigi.pdfIn PDF document text
    • https://labopepiw.weebly.com/uploads/1/3/4/7/134747507/jegurarupaje_xelokim_mefatemawi.pdfIn PDF document text
    • http://instapriz365.site/xonedeziwafirebijkyyw.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/xamibudasagas/whatsapp_video_gana_karna.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_off0000cc76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC76 5532 bytes
SHA-256: 9ae257b22aa3abed557b17ee3964caaaf7822aba8257abf070547dea4abe5c7c
font_01_sfnt_off0000df7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF7B 11076 bytes
SHA-256: 4037f6f9a89dcddd7f8d950199e21fbed650082291a71dfc2028db3b7b60358f

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