Malicious PDF — malware analysis report

Static analysis result for SHA-256 2ead2ac0a4889c0c…

MALICIOUS

PDF

81.4 KB Created: 2021-03-18 13:46:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c63e4b0905de914eb349bad5e1e46bb3 SHA-1: 175853a87df564b6a64b677a944cd04d6c337fd9 SHA-256: 2ead2ac0a4889c0c81228d26d96ad71f172901c7f6a0e152d23c9aa57b09f401
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to PDF files hosted on file-sharing services, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the presence of numerous external URLs and the PDF_SEO_LINK_FARM heuristic suggest the document is designed to redirect users to potentially malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://lozipotod.ru/123?utm_term=letter+format+in+english+for+leave
    • https://vasetovomakoti.weebly.com/uploads/1/3/2/7/132741031/gogiwugufudifizasez.pdf
    • https://kuwobudub.weebly.com/uploads/1/3/4/5/134587752/mitejiduvinozifo.pdf
    • https://wesoxuzepa.weebly.com/uploads/1/3/4/3/134372623/3dcdc4e299952c1.pdf
    • https://fitulepam.weebly.com/uploads/1/3/0/8/130874207/6619719.pdf
    • http://vajukadezazi.getenjoyment.net/jane_eyre_bildungsroman.pdf
    • https://cdn.sqhk.co/difixoruze/hgh85ge/basketball_3_point_line_australia.pdf
    • http://wulixiv.sportsontheweb.net/31959530508.pdf
    • https://cdn.sqhk.co/rolileduvof/idgi6ih/adidas_nmd_r1_white_and_orange.pdf
    • http://dovulup.iblogger.org/53996473943.pdf
    • http://jujasoje.iblogger.org/2958381525.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://sufitinefa.epizy.com/how_to_reset_unifi_ap_to_factory_default.pdf
    • https://e0ff2378-281a-4ea3-95ae-419c526fdc99.filesusr.com/ugd/0baf77_69cd51098f4e43e69e280d6b0b47a9ff.pdf?index=true
    • http://sixeres.epizy.com/wakag.pdf
    • http://wunilos.epizy.com/factoring_polynomials_examples.pdf
    • http://gakilasefit.myartsonline.com/40712653068.pdf
    • http://robabaxagolelez.rf.gd/bosch_washer_dryer_wvg30461gb_manual.pdf
    • http://dekagozavamog.epizy.com/59501670394.pdf
    • http://pidusagi.atwebpages.com/catalogo_novo_hinode_2020.pdf
    • http://moxododokojuke.epizy.com/wifevoxisi.pdf
    • http://digutir.rf.gd/before_sunrise_1995_free_movie.pdf
    • https://f2fffe36-c7b4-4b88-9608-518dc6c14750.filesusr.com/ugd/950b2a_cb75ad717d2e44e192b794b2ff9acb48.pdf?index=true
    • https://3633ae4e-9acc-45df-885e-1bfa1481cb44.filesusr.com/ugd/e73054_2ea01b569dea4a81809a15888d275247.pdf?index=true
    • http://pewulalabes.epizy.com/bus_architecture_of_8085_microprocessor.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000101ff.bin
725f4f6052ebc8225c013b19e9889e33c27475a04907aae8e8eef759649a6eec		 pdf-font-stream PDF embedded font (sfnt) at offset 0x101FF 5180 bytes
font_01_sfnt_off00011381.bin
53e80b3e53bf1bc439b97598ae4a63379e0fbbc6ed7d043a9b2626c16e3fb650		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11381 10648 bytes

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