Malicious PDF — malware analysis report

Static analysis result for SHA-256 50991639b4d3b97b…

MALICIOUS

PDF

84.7 KB Created: 2021-06-10 18:49:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 48231c9e026f5cdfecb6cc80081be1fe SHA-1: dda9889b6ff62a2c591fbd26276afdaa8a65d7ba SHA-256: 50991639b4d3b97be579e38b0d7fbb7bc39dc03fc0be0aaf38e3f4619eaa48a5
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing operation. The ClamAV detection and ML classifier strongly indicate malicious intent, likely to redirect users to malicious sites or download further payloads. The document body, though heavily obfuscated, contains keywords related to financial guides, which is a common lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://ponafet.ru/123?utm_term=ifrs+16+leases+pwc+guide
    • https://mubelumovetofap.weebly.com/uploads/1/3/1/8/131856402/3bef62.pdf
    • https://ladubikoniku.weebly.com/uploads/1/3/0/9/130969526/wugulibiwifawog.pdf
    • https://nogusevufofe.weebly.com/uploads/1/3/4/5/134525370/bac634a896.pdf
    • https://putesoborufo.weebly.com/uploads/1/3/0/8/130814126/4484891.pdf
    • https://static.s123-cdn-static.com/uploads/4451757/normal_5ffb11e99b0d3.pdf
    • https://pejirudofatepo.weebly.com/uploads/1/3/4/6/134648176/gadejaxutawutav.pdf
    • https://zokuwobame.weebly.com/uploads/1/3/1/8/131856234/7245610.pdf
    • https://cdn-cms.f-static.net/uploads/4458837/normal_6048be2f9f0e5.pdf
    • https://gidiwukos.weebly.com/uploads/1/3/1/3/131381706/afec71709a3b43.pdf
    • https://kipejuxi.weebly.com/uploads/1/3/2/6/132682137/1034668.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://bajupuko.pbworks.com/w/file/fetch/144647205/baldis_basics_plus_free_download_pc.pdf
    • http://xuwuziz.pbworks.com/f/dafifegomeg.pdf
    • http://botinuba.pbworks.com/w/file/fetch/144895251/san_andreas_download_for_pc_windows_10_free.pdf
    • http://lekipirunezi.pbworks.com/f/add_and_subtract_fractions_lesson_6.5_reteach_answer_key.pdf
    • http://vazesuna.pbworks.com/w/file/fetch/144497751/fetuvegudabi.pdf
    • http://zorisomofi.pbworks.com/w/file/fetch/144565542/mah_rating_9_volt_alkaline_battery.pdf
    • http://lifelekufa.pbworks.com/w/file/fetch/144624099/garurisij.pdf
    • http://kufujibumufa.pbworks.com/w/file/fetch/144411729/pevozibexegikadokuz.pdf
    • http://nugurafuge.pbworks.com/w/file/fetch/144696558/connectors_in_english_grammar_exercises_with_answers.pdf
    • http://xugilip.pbworks.com/f/imek_mekkuin_izgi_film_trke_dublaj_full_izle.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f69f.bin
df27aff36663385dddde68bfb0a3d229a09250cc46eaf9227da9f8d305db8c70		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF69F 5144 bytes
font_01_sfnt_off00010838.bin
414d786b459f0f5d2a731291ef1b870d88176140611ada2eab9f82aaf6e76e23		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10838 1940 bytes
font_02_sfnt_off0001116e.bin
124bcde3c512a608a0ed299cfae71a6be0197c17d29be3625598e3abd60cdc2f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1116E 11080 bytes
font_03_sfnt_off00013732.bin
0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13732 4324 bytes

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