Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8dcfd0e8caef4ac…

MALICIOUS

PDF

79.1 KB Created: 2021-04-30 03:10:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: da6fda836cdabb3a3f1951d2214b9695 SHA-1: eca4a5e54a83ffbb220c25f57763430cc45cb238 SHA-256: d8dcfd0e8caef4ac4eb3d04262152a952dda4a9c5f7704d782e18a7eeb281008
186 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as a link farm and by a machine learning classifier as malicious. It contains numerous external links, many pointing to disposable domains, suggesting a phishing or SEO spam campaign. The ClamAV detection confirms its malicious nature, identifying it as Pdf.Phishing.Trojan. No scripts were extracted, but the presence of external links indicates an attempt to redirect the user to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 6

  • 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 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.
  • 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://zajinet.ru/strik?utm_term=what+are+the+four+principles+of+design PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4407562/normal_601875c22bc66.pdfIn PDF document text
    • https://cdn.sqhk.co/vugomupuzisa/njije8T/tasty_planet_forever_free_download_for_pc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413848/normal_601646e592da0.pdfIn PDF document text
    • https://cdn.sqhk.co/gixelotopa/ciiiigh/block_story_free_diamonds.pdfIn PDF document text
    • https://cdn.sqhk.co/xivomojuf/iCig89y/76645872042.pdfIn PDF document text
    • https://cdn.sqhk.co/toviranevu/iib96Vk/how_to_draw_female_superheroes_step_by_step.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470409/normal_6052cfab9665f.pdfIn PDF document text
    • https://wadenipix.weebly.com/uploads/1/3/1/4/131408068/6488565.pdfIn PDF document text
    • https://kafekejanabex.weebly.com/uploads/1/3/2/7/132740445/lupewumusugezegafu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460980/normal_6052aaa708f52.pdfIn PDF document text
    • http://kafujaguvo.mygamesonline.org/33745910100.pdfIn PDF document text
    • https://fugokepak.weebly.com/uploads/1/3/4/8/134856046/205122.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4482206/normal_5fff5831d7896.pdfIn PDF document text
    • https://toposizijud.weebly.com/uploads/1/3/0/7/130776562/8178550.pdfIn PDF document text
    • https://wajovojov.weebly.com/uploads/1/3/4/6/134652085/puvawanutewe.pdfIn PDF document text
    • http://xunetokawetik.sportsontheweb.net/dusiderifivugekepu.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/fbc03331-9951-4dd5-a3da-33993c17c64a/le_petit_nicolas_full_movie_online.pdfIn PDF document text
    • http://kedisijusa.onlinewebshop.net/proscan_plded3273a_reset_button.pdfIn PDF document text
    • http://lapetagalelan.myartsonline.com/alucinaciones_por_drogas.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2b9510db-db59-474d-8a66-17b00983e29a/wu_tang_saga_hulu_episodes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bb2bbbca-6e7c-4fb3-ab90-77f7982b8c88/are_old_guitars_worth_anything.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f9a2c1b6-22df-485b-95f4-d92e8c883735/35149715932.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dde3f187-aa16-4755-bc36-71af7a02e28e/vujafilefemolatifokeder.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_off0000f6c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6C8 5432 bytes
SHA-256: 80e0ff95f3d218c2cca61d8707c28d81983fd7a3fb5ed747f17f7a7aa8366d7c
font_01_sfnt_off00010947.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10947 10396 bytes
SHA-256: 47ea0207b49c1f40376ea4df1fd4532944709131c9bd0eda200fd29234e5fd68