Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d34e00dfcee2eac…

MALICIOUS

PDF

73.1 KB Created: 2021-02-17 05:25:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: b4669b766884f42c234c6a5fe01763c9 SHA-1: 9a50b4c599f1486c1a4b397b00339a2f952e0c94 SHA-256: 4d34e00dfcee2eace2875cb66659148b23976d0559d38da9aef311453a1d6355
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://baarspo.ru/strik?utm_term=sims+3+free+download+macbook+air PDF link annotation
    • https://cdn.sqhk.co/tororukiwuri/hiigib4/auto_accident_near_me_today.pdfIn PDF document text
    • http://menformula.xyz/factoring_quadratics_worksheet_answer_keyb3hm7.pdfIn PDF document text
    • http://rmk4sale.xyz/os_axiomas_de_zurique_completo_gratisa3zec.pdfIn PDF document text
    • http://eagleaff.com/rolisosowokoak0xf.pdfIn PDF document text
    • https://cdn.sqhk.co/kifuzopeko/6CAjaja/59949230906.pdfIn PDF document text
    • http://autolombardpro.ru/wopajakilidesixazyglkc.pdfIn PDF document text
    • https://foxenaduro.weebly.com/uploads/1/3/1/1/131164157/putuw.pdfIn PDF document text
    • http://agentsecure.space/fuzufupagovegujalosikuxhrmq.pdfIn PDF document text
    • http://elerctum.org/vupafukwf0p.pdfIn PDF document text
    • https://cdn.sqhk.co/mowasikuso/ieulLhb/hello_neighbor_act_4_basement_walkthrough.pdfIn PDF document text
    • http://wdd13.ru/rgb_led_radio_controldv1gq.pdfIn PDF document text
    • http://fb-ig-violation.com/reply_to_thank_you_email_formal_sampletveq0.pdfIn PDF document text
    • https://cdn.sqhk.co/purizepore/R1ifOyu/call_of_duty_mobile_garena_di_pc.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zipokuxabatu.rf.gd/how_to_unlock_my_whirlpool_oven_door.pdfIn PDF document text
    • http://zitejilid.epizy.com/arrange_decimals_from_least_to_greatest_worksheet.pdfIn PDF document text
    • http://rowavironipomiz.epizy.com/company_communication_strategy_template.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_off0000df45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF45 5732 bytes
SHA-256: bee468fc93382fbacb32960d99273a8a822a0d6244018324e6541a3a8dc9ce62
font_01_sfnt_off0000f2c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2C0 10812 bytes
SHA-256: 6b10d978d5b312c0cf4b4924bbf5321cc4a554ba9db8c789032dacd6cb668526

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