Malicious PDF — malware analysis report

Static analysis result for SHA-256 67c5a33686db828e…

MALICIOUS

PDF

73.6 KB Created: 2021-06-09 22:38:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 60ecc525f11385c906a65cc88ad8afdf SHA-1: aedb6e51ac55bea70d9bf2687be1f6056d518372 SHA-256: 67c5a33686db828efeaf6ed7a3e786773ff6af405d2a11b2d1d822a92c515668
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan' and an ML classifier indicating high maliciousness. The PDF contains numerous embedded URLs, many pointing to disposable hosting, suggesting a link farm designed to distribute malicious content or phish users. The presence of external URIs and the overall structure strongly indicate a phishing or malware distribution attempt.

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://wastran.ru/pbw?utm_term=sword+art+online+progressive+light+novel+volume+1+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4458840/normal_60315a99a88a0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421214/normal_5ffa192005e3b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4498893/normal_5fcd594888dfa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4382770/normal_5fdf6b741e7ba.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376874/normal_604044c02ef04.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369504/normal_606b6a6d403c0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391327/normal_60394779357c2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467027/normal_603935eaeb542.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/193e6450-f85e-4b32-abbd-907ad5f070bf/what_is_the_duration_of_ethical_hacking_course.pdfIn PDF document text
    • http://xedidovetaw.pbworks.com/f/kiferadavoduwudem.pdfIn PDF document text
    • http://bopelijexuf.pbworks.com/f/math_accelerated_a_pre-algebra_program.pdfIn PDF document text
    • http://zopilep.pbworks.com/w/file/fetch/144702003/parozomufaz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/83175d73-1a1d-41b4-a719-def2f9ceb6bd/32434464637.pdfIn PDF document text
    • http://wigonewakil.pbworks.com/f/how_to_reset_apple_id_password_with_email_only.pdfIn PDF document text
    • http://wotasaful.pbworks.com/w/file/fetch/144894894/bahubali_2_sad_background_music.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/836d1f95-93b4-462b-8da1-afbcf872df6a/basic_chinese_language_translation_to_english.pdfIn PDF document text
    • http://rubuxesi.pbworks.com/f/is_there_a_ps3_emulator_for_pc.pdfIn PDF document text
    • http://nilanom.pbworks.com/f/nutricion_enteral_y_parenteral_anaya.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c7693753-1599-4e31-a380-f725c49ca57f/arris_sb6141_reset.pdfIn PDF document text
    • http://gepefupugalu.pbworks.com/w/file/fetch/144509850/how_do_you_report_stock_earnings_on_taxes.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_off0000de37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE37 5760 bytes
SHA-256: f87f288f726c2138c0c5410e68d2238e85d90c01e6a4ba09fd0510b8c9f4a243
font_01_sfnt_off0000f1c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1C9 11144 bytes
SHA-256: 2a18f70858d27aec2028892954658ae1ec32f86486a640e477308c26fdf18d8f

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