Malicious PDF — malware analysis report

Static analysis result for SHA-256 ffd9f62b5f03c7ba…

MALICIOUS

PDF

78.5 KB Created: 2021-04-23 12:56:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: 6a5ee115d1ac56948da1a1a09bf482c3 SHA-1: eb3911574d9b7d07b1a6f0e73fb635e308f07b7e SHA-256: ffd9f62b5f03c7ba3f0d81fb773f12874aeb96b2d8eda6b7594359aa1b0d0aee
186 Risk Score

Malware Insights

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

This PDF file contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing operation. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to malicious sites for credential harvesting or malware delivery. The document body, though heavily obfuscated, contains metadata related to wkhtmltopdf, which is often used to generate PDFs from web content, further supporting the lure-based attack pattern.

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://midufefew.ru/strik?utm_term=is+the+maze+runner+on+netflix+uk+2021 PDF link annotation
    • https://cdn.sqhk.co/seponidozit/jbqeq9A/brightocular_eye_color_change_surgery_cost.pdfIn PDF document text
    • https://rumevupalod.weebly.com/uploads/1/3/0/7/130739773/nanuget.pdfIn PDF document text
    • https://cdn.sqhk.co/gidetixi/kjdTEPn/81929269093.pdfIn PDF document text
    • https://josabinisepev.weebly.com/uploads/1/3/1/4/131452942/b70977c0ad86bb.pdfIn PDF document text
    • https://cdn.sqhk.co/tamenotu/iigjbja/chromas_pro_manual.pdfIn PDF document text
    • https://patawera.weebly.com/uploads/1/3/4/1/134131312/jupugetajij.pdfIn PDF document text
    • https://cdn.sqhk.co/tumokufagu/VxtYjcG/dagisofufo.pdfIn PDF document text
    • https://keduwamiboru.weebly.com/uploads/1/3/4/6/134669925/tewutijudom.pdfIn PDF document text
    • https://jazafojof.weebly.com/uploads/1/3/4/3/134310209/1972321.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://d54d55f4-8004-4613-9f19-7b96cbed0ae7.filesusr.com/ugd/ce4b32_f410aa4ef5ad4fc0bd69f94f349ddf37.pdf?index=trueIn PDF document text
    • https://07e0a16e-b77d-475b-b724-88bbaedb347c.filesusr.com/ugd/8e9e2f_b50a0a6402aa4407ae48f8181a4843d0.pdf?index=trueIn PDF document text
    • https://1864c106-1a4f-4194-99fb-dabd5a0af450.filesusr.com/ugd/17b194_c3ed0bc641814e0d9f71d465fbf94b11.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/gumagabu/60210057474.pdfIn PDF document text
    • https://2a082fd4-e93f-4b8e-9e59-408fa046b31c.filesusr.com/ugd/e334dd_ce8697219eee485899625b606eb8a83f.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/sasufufa/kguard_security_camera_software.pdfIn PDF document text
    • https://s3.amazonaws.com/nakuzafol/dubivo.pdfIn PDF document text
    • https://47e4df30-8702-49a4-8bd5-327e1546ff06.filesusr.com/ugd/379272_df7bc078e39347ff890a1d4d4ddc69fa.pdf?index=trueIn PDF document text
    • https://cda84be5-0c54-4c05-8389-97bb004c798d.filesusr.com/ugd/fa9f00_6339436f5ee440209ee7a43c12fdc427.pdf?index=trueIn PDF document text
    • https://45b0b119-5f8c-43e7-b437-4e12d17c1c81.filesusr.com/ugd/3826db_5d7667bacc8e4bbd9738833fea8a817b.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/c64310bf-2ecd-44d0-854c-3602a41eba1d/pantum_p2500w_printer_driver_free_download.pdfIn PDF document text
    • https://b634734f-67aa-4edc-9b69-dcf7610e4690.filesusr.com/ugd/c86859_b02db6fa38c447da92a2cdeb0687a11d.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/f881efab-e9b4-44ab-9855-9a376737e00d/georgia_driving_school_practice_test.pdfIn PDF document text
    • https://c18d9829-3add-4afa-bc87-35007fe3998a.filesusr.com/ugd/70c1ec_816568262e6843bba14b656d7d16a462.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f55c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF55C 5452 bytes
SHA-256: 9713ff411dd6c928039bc172018dcfbebebdb0713f8d6054f86bbf35b63951a6
font_01_sfnt_off000107c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107C9 10944 bytes
SHA-256: f1ebb11de2f4af9b54db7d487afbefc8915f738f740627f89b873c18892ccb7b

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