Malicious PDF — malware analysis report

Static analysis result for SHA-256 1ac0aeec23da3e3f…

MALICIOUS

PDF

88.2 KB Created: 2021-04-06 21:28:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 2b3906b3b36205955843ad397be2e401 SHA-1: ca0cef22f37a8b29687af69344b989b0f2ccc0c6 SHA-256: 1ac0aeec23da3e3fa38c5b0699fcfb2a9d86a75edcfb084862914868fe8c453a
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, identified as a link farm, with the primary URL suggesting a lure for a product manual. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure and external links point to a common tactic of redirecting users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://fokemale.ru/wix?keyword=maytag+dishwasher+quiet+series+300+manual PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4495385/normal_6067ee45922ed.pdfIn PDF document text
    • https://nijuvabuf.weebly.com/uploads/1/3/5/3/135326727/7959257.pdfIn PDF document text
    • https://cdn.sqhk.co/tuxonewebuke/jehjXKC/38561407380.pdfIn PDF document text
    • https://cdn.sqhk.co/vagofedewat/ZaiiggN/horizon_driver_education.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444856/normal_606453b8671c9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419437/normal_6012b188634b5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387922/normal_6021448067f89.pdfIn PDF document text
    • http://blacktea.space/79645724042w02ev.pdfIn PDF document text
    • http://yozi.store/penedibizagogegoreb8hi6l.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4414335/normal_6004fa22d7d2b.pdfIn PDF document text
    • https://norusukesalija.weebly.com/uploads/1/3/4/3/134356509/2bd2e952a.pdfIn PDF document text
    • https://paweweribawu.weebly.com/uploads/1/3/4/6/134656346/ledufab_tewawan.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413346/normal_5fe3b82720b08.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495387/normal_600ddd00d96a0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4461766/normal_6058e9ce3c9de.pdfIn PDF document text
    • http://wiinorama.website/rawofoturemizivagoxumpcvu.pdfIn PDF document text
    • https://cdn.sqhk.co/mopomotop/TiiTvSt/the_lighthouse_ending_analysis.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372085/normal_5fd307122a87c.pdfIn PDF document text
    • https://cdn.sqhk.co/livefivepa/hchf9ia/interrogative_pronouns_worksheet.pdfIn PDF document text
    • https://banepopewux.weebly.com/uploads/1/3/4/2/134234854/2816229.pdfIn PDF document text
    • http://uscreditreport.info/diablo_3_xbox_360_save_game_editor_downloadj6tkx.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/gonafoziguwewe/how_to_check_serial_number_of_laptop_in_ubuntu.pdfIn PDF document text
    • https://s3.amazonaws.com/vedexajawo/bram_stoker_dracula_castle.pdfIn PDF document text
    • https://s3.amazonaws.com/jirebonudur/94104323158.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010bdf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BDF 5640 bytes
SHA-256: 4ccd17c6cc668d18d05a24483594a739894b0334a4e9f82866ad132244fcb298
font_01_sfnt_off00011ef4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EF4 11228 bytes
SHA-256: 855aaf9e4c7067abf13712a75b40fdc37a2daf32d103d508c045b58d314ad3b4
font_02_sfnt_off0001452e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1452E 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3