Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba298998925402ff…

MALICIOUS

PDF

74.2 KB Created: 2021-03-23 00:53:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 5db73670db9f0a241307a25b0d7ac52b SHA-1: 23dcc8e2e9aa888abe3289fe260cadb40e0d9c71 SHA-256: ba298998925402ff2a23912be72c5998e60b70cc83896dacc0ffe1f5a4c1dcd7
186 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. It contains a large number of external links, many hosted on disposable domains, suggesting it functions as a link farm designed to redirect users to potentially malicious content. The presence of embedded URLs and the overall structure point towards a phishing or malware distribution scheme, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://seumenha.ru/strik?utm_term=construct+2+tutorial+pdf PDF link annotation
    • https://cdn.sqhk.co/feripamapuv/Mihojs5/saxesoxevumenefe.pdfIn PDF document text
    • http://honbiz.pro/microsoft_flight_simulator_2020_release_date_priceo7ar8.pdfIn PDF document text
    • https://cdn.sqhk.co/bepesewutu/epY1ijy/43682526469.pdfIn PDF document text
    • https://cdn.sqhk.co/savadapo/n3Wheji/roblox_mining_inc_remastered_script.pdfIn PDF document text
    • http://ligumexijigab.getenjoyment.net/wixogo.pdfIn PDF document text
    • http://smm-target.ru/977907935306c149.pdfIn PDF document text
    • http://losmopaka.site/17022835066nqv87.pdfIn PDF document text
    • https://cdn.sqhk.co/gukokefa/bdZhadi/68274739385.pdfIn PDF document text
    • http://lakujalinifibo.mypressonline.com/agere_sequitur_esse.pdfIn PDF document text
    • https://cdn.sqhk.co/jozunufap/Fhfql0M/tweencraft_cartoon_video_maker_animation_app.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/5480b1b3-ccda-427a-9692-0ea0bce0da27/lirudewegomadis.pdfIn PDF document text
    • http://lajovaputap.myartsonline.com/export_file_ke_excel.pdfIn PDF document text
    • https://34184745-b1ec-4725-b105-60c94cc90871.filesusr.com/ugd/63369f_5488f8e8f3b944d7b6b55fb479e23b7c.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/luborinizu/16965934744.pdfIn PDF document text
    • https://s3.amazonaws.com/mefonevimimix/dororo_op_piano_sheet.pdfIn PDF document text
    • https://16012499-1299-48b0-8cdd-5f23a7749958.filesusr.com/ugd/fafc38_6b10e0afadba40079dd9eb765567659f.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/daselex/answers_to_close_up_pics_level_6.pdfIn PDF document text
    • https://da99f664-88c7-4a27-98aa-0bbcec2e8f57.filesusr.com/ugd/66f3f9_821b50858c22416498afb3a5159fbed2.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/2eb67ee6-47f8-4779-aa5a-977542d48c05/how_to_fix_a_broken_charger_port_iphone_6.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/85d916d1-0ca5-4c9d-bc04-ae3e14b7985c/wheel_horse_520h_seat.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_off0000e628.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE628 5188 bytes
SHA-256: cdafa072eb9678d46b4519ad0736957e289181247f8ee2607456967519a363cb
font_01_sfnt_off0000f7db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7DB 10588 bytes
SHA-256: 087b0286f05dea085ff77c44f91e03141ed8872c60f79859f75e0022a962add1

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