Malicious PDF — malware analysis report

Static analysis result for SHA-256 824c40471c9a9de8…

MALICIOUS

PDF

77.0 KB Created: 2021-03-16 23:05:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: fbb560b8a0fcb0e0479d447a256f3537 SHA-1: aef76a76ed77aa32b5059b036a2c7aea75dad066 SHA-256: 824c40471c9a9de8a97b19d232afa33490cfb3c0216116539cac47986b899ffe
194 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The presence of a large number of external links, including a link farm on disposable hosting, suggests a tactic to distribute malicious content or phish users. The document body, though heavily obfuscated, contains metadata related to PDF generation, but no direct instructions or lures are discernible. The primary attack vector appears to be directing users to external malicious sites via embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 7

  • 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.
  • 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://seumenha.ru/award?keyword=rotational+symmetry+worksheet+pdf PDF link annotation
    • http://wejowadizabudex.mypressonline.com/52525711343.pdfIn PDF document text
    • https://cdn.sqhk.co/livatunozasu/9vaRlHn/zazito.pdfIn PDF document text
    • http://mibemuxagegija.mywebcommunity.org/the_mortal_instruments_series_by_cassandra_clare.pdfIn PDF document text
    • https://cdn.sqhk.co/perikowep/ichdijc/business_board_game_rules_in_tamil.pdfIn PDF document text
    • http://figupatofewox.iblogger.org/bhagwan_dada_film_songs.pdfIn PDF document text
    • http://xexejevun.medianewsonline.com/bazuvenubi.pdfIn PDF document text
    • http://zotoxilob.getenjoyment.net/kepimogafiwogaruf.pdfIn PDF document text
    • https://cdn.sqhk.co/sesijisova/eQjjhjw/mijegiwijadujibe.pdfIn PDF document text
    • http://garanibukumom.scienceontheweb.net/jarasorem.pdfIn PDF document text
    • http://xizugef.medianewsonline.com/verij.pdfIn PDF document text
    • http://velavedi.iblogger.org/69694547377.pdfIn PDF document text
    • https://cdn.sqhk.co/sidamebo/hccjihh/commuter_rail_cars_for_sale.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://d4e73f68-9870-4c81-be0c-0a6dd7607cd2.filesusr.com/ugd/6f53d7_9d8cf0bbf5a04fdabe3ef99bf8edbcf6.pdf?index=trueIn PDF document text
    • http://vexolofifete.atwebpages.com/napowax.pdfIn PDF document text
    • https://e0f910ba-f4aa-4d6b-87f6-24d78cda99ab.filesusr.com/ugd/cc15ef_c89cff7e6a284751bbdfb61b2e754a16.pdf?index=trueIn PDF document text
    • https://a001dc82-f31e-4944-9b76-0a8e602b6855.filesusr.com/ugd/e4ee87_98aff4b537df4e919d2d692b42390725.pdf?index=trueIn PDF document text
    • http://pekafujojef.onlinewebshop.net/can_a_building_collapse_from_earthquake.pdfIn PDF document text
    • http://daxafedijumexir.rf.gd/jenizojimebiwixar.pdfIn PDF document text
    • https://b23183eb-b2e5-455e-bc25-91fac1efd10f.filesusr.com/ugd/cc14e4_f36b87985e2f482984f64d4a0301342b.pdf?index=trueIn PDF document text
    • http://bigamutalunu.atwebpages.com/3055695438.pdfIn PDF document text
    • https://24218389-b518-4ca3-8548-65eaf758daa4.filesusr.com/ugd/c836c3_13198db002a54ee9a5dd92519e10841e.pdf?index=trueIn PDF document text
    • https://a32e93c2-1aa3-4149-af29-aa5d163ab988.filesusr.com/ugd/40336e_3e7f4c93507843629bd4133d4d44f3af.pdf?index=trueIn PDF document text
    • http://duvuxosejoxogu.rf.gd/agua_de_beber_partitura.pdfIn PDF document text
    • https://ccd4a2e6-63e2-4dcb-a02e-1ae1253dabcc.filesusr.com/ugd/059ff1_58e5b4a58c9c4243933b31e11a0ec110.pdf?index=trueIn PDF document text
    • https://e06e8306-d71e-4c92-aa1b-e8c52eeb44cb.filesusr.com/ugd/bc4951_b03a91865e9a4b958e32b1448aadb079.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_off0000edc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDC6 5548 bytes
SHA-256: 08de156ffc7f578545be7072eed78539356c9d9060a73178f6e597a01b84e36a
font_01_sfnt_off00010093.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10093 11056 bytes
SHA-256: af1ebdb11a8acae6c2d7ce19160c4f3eec4a390804b0bf4fea027bf825e38462

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