Malicious PDF — malware analysis report

Static analysis result for SHA-256 decb76dd0265b98b…

MALICIOUS

PDF

87.8 KB Created: 2021-06-01 10:35:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 6b3ba31b552f9c14a7d3d8f797e7d81b SHA-1: 5c74955a4662b51cdd66047c835095ce38b530e3 SHA-256: decb76dd0265b98b7cd8831843477918ead1ead20b562f51b70ed8ea4b0d4e6a
226 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File T1059.007 JavaScript

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO spam operation. The document body, though heavily obfuscated, contains text related to opening file types, likely a lure to encourage users to click the embedded links. The 'SE_CLIPBOARD_COMMAND_LURE' heuristic indicates the document may also attempt to trick users into executing commands.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

Heuristics 7

  • 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.
  • Clipboard command execution lure high SE_CLIPBOARD_COMMAND_LURE
    Document tells the user to copy or paste clipboard content into Run, PowerShell, cmd, or another shell-like execution context
  • 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://queure.ru/pbw?utm_term=how+to+open+an+ipynb+file+on+mac PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4421330/normal_602f32ff18ac3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459057/normal_6032d4256ca68.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454995/normal_601448969b48e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459059/normal_605d7d8bd3167.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383804/normal_603aa2af9adee.pdfIn PDF document text
    • https://bimozasobo.weebly.com/uploads/1/3/1/3/131398313/xalukonaxalupe_zevujape_losug.pdfIn PDF document text
    • https://foxakiletomuxo.weebly.com/uploads/1/3/4/0/134012751/sugabutesoj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387052/normal_604970fd2d97e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417818/normal_600c382dc5f36.pdfIn PDF document text
    • https://panatomovedo.weebly.com/uploads/1/3/4/6/134688712/noruwuvitoje.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4467285/normal_5ff3068ddb880.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450244/normal_60245dcbcdd8e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386080/normal_6019bf3e672af.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://niluputevi.pbworks.com/w/file/fetch/144443295/3797045833.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/de2515f7-e6bc-42ff-89b4-53972c7b4c64/48013709031.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d225698e-3350-4105-a23b-8020e72c4b15/what_is_the_cheapest_dirt_bike.pdfIn PDF document text
    • http://xuresasadox.pbworks.com/w/file/fetch/144446562/linear_equations_word_problems_for_class_8.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3271febd-4fbc-4203-81cb-60d07495ab40/nook_hd_plus_battery_not_charging.pdfIn PDF document text
    • http://xutosop.pbworks.com/w/file/fetch/144445629/fomevibajamuwexef.pdfIn PDF document text
    • http://lekipirunezi.pbworks.com/f/convertir_coordenadas_geograficas_utm_a_grados_minutos_y_segundos.pdfIn PDF document text
    • http://banusiv.pbworks.com/w/file/fetch/144441909/jlg_boom_lift_operating_instructions.pdfIn PDF document text
    • http://xuresasadox.pbworks.com/w/file/fetch/144445365/how_to_do_fundamental_analysis_in_stock_market.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b979c899-cd86-4700-baf7-66f0847911c5/how_is_ltd_company_tax_calculated.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b344e8d8-e17a-45a6-858c-bfcb7fd14c8d/e_minor_blues_scale_guitar_tab.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000104ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104AB 5180 bytes
SHA-256: 9eb29480f277fa36ec89ab5ed1802ee155722ecf333c5683dc52e09436304eda
font_01_sfnt_off0001165b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1165B 10708 bytes
SHA-256: c807557e656a3eb379423ec75d6853ebe5da07725566db2176047d7f939451de
font_02_sfnt_off00013b66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B66 16460 bytes
SHA-256: d975aad05103e6e5903d34981b043fb1fb57f4c56d562641d58fe6d22a3d0398

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