Malicious PDF — malware analysis report

Static analysis result for SHA-256 93c9d5822a90b9b6…

MALICIOUS

PDF

76.5 KB Created: 2021-03-18 12:08:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-20
MD5: f1c5968491de00d9a393889976bcac57 SHA-1: b5ca8477df439fb3a6f20ee45d6d1ec9f958332f SHA-256: 93c9d5822a90b9b6df7b94f346ce450c29fdadaf65766509c28648b23a5da830
186 Risk Score

Malware Insights

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

This PDF document exhibits characteristics of a link farm, containing a large number of external URLs, many hosted on disposable domains. The heuristic 'PDF_SEO_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' indicate a non-standard use of PDF for SEO manipulation or potentially to host phishing links. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution via the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://nipisod.ru/wix?keyword=unblocked+tetris+hard+drop PDF link annotation
    • http://dororuminaxa.mywebcommunity.org/what_is_dtr_in_crochet_uk.pdfIn PDF document text
    • https://navojinalano.weebly.com/uploads/1/3/4/7/134755450/bitinadaze_gotibekidel_kimenimab.pdfIn PDF document text
    • https://losanuritajog.weebly.com/uploads/1/3/4/7/134730792/penibe.pdfIn PDF document text
    • https://felogenapugiro.weebly.com/uploads/1/3/5/3/135327705/1729865.pdfIn PDF document text
    • http://vamolufu.getenjoyment.net/93721234320.pdfIn PDF document text
    • http://nipamaton.22web.org/oracle_database_client_installation_guide_12c_release_1_12.1_for_linux.pdfIn PDF document text
    • http://fupefabesosada.mygamesonline.org/sovugixuribujaxut.pdfIn PDF document text
    • http://fujigukatujewu.medianewsonline.com/digestive_system_worksheet_grade_4.pdfIn PDF document text
    • http://paxenazubenib.mygamesonline.org/25392051692.pdfIn PDF document text
    • http://xuzerujagojagip.scienceontheweb.net/44536100892.pdfIn PDF document text
    • https://nakagikirowi.weebly.com/uploads/1/3/2/6/132695306/3552605.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zerujafulo.rf.gd/fuboberotedezovifo.pdfIn PDF document text
    • https://s3.amazonaws.com/lorerexeg/superman_movie_for_mobile.pdfIn PDF document text
    • http://nisuzadusidu.epizy.com/21803990093.pdfIn PDF document text
    • https://6a24fdd2-d4a5-4c4b-882b-0f3115751bcf.filesusr.com/ugd/04e6f9_94453cfd88df46c6bd1d9f1de320d99c.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/difigomisosak/164_nj_bus_schedule.pdfIn PDF document text
    • https://s3.amazonaws.com/dikobepibelun/jarekogix.pdfIn PDF document text
    • https://s3.amazonaws.com/rafiralexezol/14324655619.pdfIn PDF document text
    • http://katufimeg.rf.gd/cancer_cuello_de_utero.pdfIn PDF document text
    • https://fd7a53fe-11c1-4e60-83ad-ac1bb997268f.filesusr.com/ugd/5cf23b_874d7b314b984715b4893f69e26b91be.pdf?index=trueIn PDF document text
    • https://60f6da8c-824c-4163-aae9-6195f2ac7ed4.filesusr.com/ugd/7f16bd_0864e996fe5c4d8c9d83a6ba76119dc2.pdf?index=trueIn PDF document text
    • http://dugerem.atwebpages.com/basic_bodice_block_drafting.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_off0000e9c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9C9 5356 bytes
SHA-256: a0012f4b1d95405bca7ef87a8c17d61f2468843dc1464b98f49e29b6a001865f
font_01_sfnt_off0000fbf5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBF5 11664 bytes
SHA-256: f0e51c2c631ce689e24b1186c2128391c4a1aff5f7569da211b3ded7a367706a

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