Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8d82ef861b826b0…

MALICIOUS

PDF

86.1 KB Created: 2021-05-01 04:19:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 4e5567cbbb6c8f3448c38cb16a91033a SHA-1: 08057939d779cb65fc942d2b01ea2599f639c55a SHA-256: f8d82ef861b826b051f37497508aece856219eb55e15b2c100b9e841af01ef3c
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable domains and are associated with link farms, indicating a phishing or scam attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://nipisod.ru/strik?utm_term=hp+8600+clean+print+head PDF link annotation
    • http://zawopim.mygamesonline.org/how_to_do_mole_fraction.pdfIn PDF document text
    • http://bitsracing.net/how_to_child_lock_panasonic_microwaveluayl.pdfIn PDF document text
    • https://donimafu.weebly.com/uploads/1/3/5/3/135395233/wekodagilutipuxoruxo.pdfIn PDF document text
    • http://paxejunon.mygamesonline.org/mugeko.pdfIn PDF document text
    • http://kogowetek.getenjoyment.net/37715642437.pdfIn PDF document text
    • http://neridofufuleteg.scienceontheweb.net/adhyatma_ramayana_marathi.pdfIn PDF document text
    • https://rebejudan.weebly.com/uploads/1/3/5/3/135316845/cbc91a0ed88f8c.pdfIn PDF document text
    • https://tisavivo.weebly.com/uploads/1/3/4/0/134040567/vexisaj.pdfIn PDF document text
    • http://webcam-model.online/53410803983z8te3.pdfIn PDF document text
    • http://inter-kalinka.ru/tipos_de_sistema_circulatorio_en_el_ser_humanownku0.pdfIn PDF document text
    • https://ragulifogikub.weebly.com/uploads/1/3/3/9/133986704/dca2faebb1e4a94.pdfIn PDF document text
    • http://dedaruk.scienceontheweb.net/muledulijovu.pdfIn PDF document text
    • http://natbeach.space/accounting_equation_and_balance_sheetraf81.pdfIn PDF document text
    • https://mikutefax.weebly.com/uploads/1/3/4/8/134866710/3455562.pdfIn PDF document text
    • https://kafunisizu.weebly.com/uploads/1/3/4/5/134599740/fatelatatuk-wenosuzosisose.pdfIn PDF document text
    • http://miromawetibikew.mywebcommunity.org/lotezuleterufamajibepu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/napisakaluja/13360605877.pdfIn PDF document text
    • http://tifavamifikas.myartsonline.com/resumen_de_rayuela_de_julio_cortazar_por_capitulos.pdfIn PDF document text
    • https://s3.amazonaws.com/rekawexuretowo/anime_slayer_apk_english_version.pdfIn PDF document text
    • http://jowokepo.atwebpages.com/fisolepa.pdfIn PDF document text
    • http://rizivubonulej.atwebpages.com/76248195941.pdfIn PDF document text
    • https://s3.amazonaws.com/wudibirewuduto/45838360885.pdfIn PDF document text
    • https://s3.amazonaws.com/mubefula/kofijogapasodero.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_off0000f868.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF868 5436 bytes
SHA-256: 537ca8b73c39b688bd88651aaa7e2f88ec11da1d74a6c8796006bec42e02fa73
font_01_sfnt_off00010ada.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ADA 12824 bytes
SHA-256: 1dc0c44e57bc694cca3bef115d295a63054fd49315b233e72f371634278be38d
font_02_sfnt_off0001351e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1351E 16352 bytes
SHA-256: 2599277a37b233f63e6df99a08ff331cf6fefbb5ce89a18614b84f19988e4b35

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