Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d85762b543f6855…

MALICIOUS

PDF

84.0 KB Created: 2021-05-01 17:25:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 4c3b35bd022176d3895003b27b3c86a9 SHA-1: 2f554617bff8c4b102c11b962172484b228b0f0e SHA-256: 9d85762b543f6855dffc352f2036bc815a582559e5420ac12b7ca51337370f4a
134 Risk Score

Malware Insights

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

The PDF contains numerous external links, with one specifically pointing to a URL containing a search term related to obtaining software for free, suggesting a phishing or malware distribution lure. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with phishing and malware delivery campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://golowaki.ru/strik?utm_term=can+you+get+autocad+for+free PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4470409/normal_605c73efd53f3.pdfIn PDF document text
    • http://leledup.mypressonline.com/exercicios_de_atomistica_com_gabarito.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486994/normal_602127831d2a0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481271/normal_60603e39248b7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407100/normal_6059cd117c2c9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416316/normal_6021f7975fcf7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4424982/normal_6005f64dc4a6e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479923/normal_60349d6a96604.pdfIn PDF document text
    • http://tulutita.sportsontheweb.net/accounting_principles_volume_1_8th_edition.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4530578/normal_5fe554856d1c1.pdfIn PDF document text
    • http://gamukanemafutu.mywebcommunity.org/21811541820.pdfIn PDF document text
    • http://www.typoland.com/http://www.typoland.com/designers/Lukasz_Dziedzic/CopyrightIn PDF document text
    • http://www.typoland.com/In PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/nerugiraxura/battle_trip_ep_90_eng_sub.pdfIn PDF document text
    • http://pokobopuket.epizy.com/la_divina_comedia_libro_en_italiano.pdfIn PDF document text
    • https://s3.amazonaws.com/pujirageg/gusexebavuxulusenelizup.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c5fe6582-7a8f-4cf4-96cf-c0f70e10e6c0/listen_the_art_of_effective_communication.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aed80a9d-2708-468e-badd-3138b8a88a89/how_to_clean_kenmore_elite_top_load_washing_machine.pdfIn PDF document text
    • https://s3.amazonaws.com/nevowimo/jekenupamefuget.pdfIn PDF document text
    • https://s3.amazonaws.com/fipijife/97844591177.pdfIn PDF document text
    • http://juberobegigig.epizy.com/49793155351.pdfIn PDF document text
    • http://bozizivaposenu.epizy.com/xudoguwidelozujozalosoj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4654f1cd-1bfd-46ef-8fa4-448151581db3/rodaworabamarawovom.pdfIn PDF document text
    • http://fibogexexagiram.rf.gd/duxufowajagidomowozez.pdfIn PDF document text
    • https://s3.amazonaws.com/tolivajupeku/kidde_i12060_home_depot.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ad3c5c70-8914-41a7-9fdc-23fd26581f9b/drivers_ed_chapter_7_vocabulary.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_off0000fb06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB06 6168 bytes
SHA-256: de6aacb5a55f55b98bf3ae384f96a51051c900e5a59c241f5198d539ce1a3af5
font_01_sfnt_off00010aa6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AA6 4988 bytes
SHA-256: e42ae79d141c59ee89a632dc66528470bfd7f1b926181d342ab37b6e97c64cca
font_02_sfnt_off00011bb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BB6 11332 bytes
SHA-256: e1d853364f7dab01bc059e43625d261f09760807e5f9a14ab210516aede71d83

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