Malicious PDF — malware analysis report

Static analysis result for SHA-256 1fe248bc6d35526b…

MALICIOUS

PDF

88.3 KB Created: 2021-04-22 22:45:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 86e707e9a2fe2168bb1a1995396f4bf1 SHA-1: 228bb6c78619a7239b0df2ffc5db2063de1b783e SHA-256: 1fe248bc6d35526b4a3632a11f9694f96998ca7d90972d680ec71bcb333727b3
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, with one prominent URL pointing to a suspicious domain ('maypoin.ru') flagged by heuristics as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery. Although no scripts were directly extracted, the PDF structure and URL analysis suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

Heuristics 5

  • 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 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://maypoin.ru/strik?utm_term=apoyo+a+la+lactancia+materna+en+ingles PDF link annotation
    • https://cdn.sqhk.co/tekuligote/LjhF8BC/furidashi_drift_cyber_sport_game.pdfIn PDF document text
    • https://cdn.sqhk.co/kifavubivelo/bjeiche/parallel_accounts_for_iphone.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479474/normal_6025b721102b6.pdfIn PDF document text
    • https://cdn.sqhk.co/joxusozomilo/gchiThi/car_action_games_racing_2020_online_play.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422640/normal_603be500826fc.pdfIn PDF document text
    • https://cdn.sqhk.co/jabosuve/kkvGUha/72185720511.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445321/normal_60315ded4a816.pdfIn PDF document text
    • https://cdn.sqhk.co/texafikogot/bidihGV/2645095370.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445531/normal_605c71066875a.pdfIn PDF document text
    • https://cdn.sqhk.co/folukize/fj0x6oy/jojiwusodapizuminitunel.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/vonutavekip/army_drill_sergeant_pay.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/790d8f76-9434-4369-b5b5-dbb243cd7fe7/25259507239.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/49d13732-f27e-4cbb-9fed-86aabdc18e70/how_to_thread_bobbin_on_singer_prelude.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/00e47ca4-c3fa-4036-835b-15a4201fc1b2/36427540093.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/40d8ff4a-e37e-4893-92ac-f7dad0628570/55524444578.pdfIn PDF document text
    • https://eed7fa7e-4f31-4ba6-8269-e73f07ac74c5.filesusr.com/ugd/93374d_c64f6a5dc0184fcd836022b2df0cbd8d.pdf?index=trueIn PDF document text
    • https://06ebba1c-c738-45d4-b58d-83edbdcc9420.filesusr.com/ugd/b14caa_01ba74dc984a4d81985d9fcaf5e86963.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/vuraradaso/25537003865.pdfIn PDF document text
    • https://s3.amazonaws.com/rafiralexezol/hypixel_appeal_format.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cd13383a-8a03-4ae2-baa3-b943d78913ae/wupetinebobew.pdfIn PDF document text
    • https://eac5c218-d238-408c-98a6-8ff0ecbb25fc.filesusr.com/ugd/b1277d_3bc2bcb240ff45bfad9b7efe64d5e44a.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fizaxo/blue_eyed_miniature_dachshund_puppies_for_sale.pdfIn PDF document text
    • https://cee4a208-09ac-40e0-983f-4c2cc776acbe.filesusr.com/ugd/5ed537_dea13b76e2584d4f8075992d174ca993.pdf?index=trueIn PDF document text
    • https://8ed62699-7d02-4439-b935-4286882ef7d4.filesusr.com/ugd/229b11_0c55dfea87bb4c5a9bac81675c21df78.pdf?index=trueIn 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_off00010939.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10939 5132 bytes
SHA-256: fb17e1096657f039022522d585186e456f0677e8d65a313c249bcf6c703d2420
font_01_sfnt_off00011a90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A90 12620 bytes
SHA-256: d887b38a06b867b02a9cbd415205ba0c389ac16b5942a00e25bb08511ca78a92
font_02_sfnt_off0001437c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1437C 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e