Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d24c9cd8cb2bad0…

MALICIOUS

PDF

69.4 KB Created: 2021-05-01 23:31:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 4dd811d5b6dfd1482d599cebff1e89a2 SHA-1: e01abcc05d6a8c38a6542388e3c0b8f6439b33bb SHA-256: 5d24c9cd8cb2bad027bd74851371f0813ebf8168ec553e49fadccfa5e9f463e6
172 Risk Score

Malware Insights

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

The file is a PDF that contains numerous external links, characteristic of a link farm or phishing lure. The heuristic 'PDF_SEO_LINK_FARM' and the presence of multiple unknown reputation URLs strongly suggest malicious intent. The ClamAV detection and ML classifier output further support this, indicating the PDF is likely a phishing or trojan delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://leonvi.ru/strik?utm_term=mathematical+proofs+3rd+edition+solutions+manual+pdf PDF link annotation
    • http://texifudosino.mygamesonline.org/celebrity_definition.pdfIn PDF document text
    • http://lamanixumerad.mypressonline.com/49360632644.pdfIn PDF document text
    • http://sokixatov.mywebcommunity.org/langenscheidt_german_english_dictionary_download.pdfIn PDF document text
    • http://wirodapupoz.iblogger.org/saps_accident_report_form.pdfIn PDF document text
    • http://nofuvadigu.22web.org/fopotilosuku.pdfIn PDF document text
    • http://gixitetopes.scienceontheweb.net/kingdom_animalia_classification_chart.pdfIn PDF document text
    • http://rexidoguvigibux.22web.org/book_report_example_3rd_grade.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/rodakarugupoko/bhojpuri_gane_hd_video_song.pdfIn PDF document text
    • https://s3.amazonaws.com/gumagabu/99460040536.pdfIn PDF document text
    • https://s3.amazonaws.com/firigugixujotov/free_bootstrap_4_templates_2017.pdfIn PDF document text
    • https://s3.amazonaws.com/tazibabebamep/fixazawenofitaruvuvosutud.pdfIn PDF document text
    • http://fapiduvegimudi.epizy.com/payment_receipt_sample.pdfIn PDF document text
    • https://s3.amazonaws.com/megujobemegor/contaminacion_atmosferica_causas.pdfIn PDF document text
    • http://xabofaveretezu.rf.gd/cerita_rakyat_indonesia_dalam_bahasa_inggris.pdfIn PDF document text
    • https://s3.amazonaws.com/nunakixuma/63630528009.pdfIn PDF document text
    • http://solejow.myartsonline.com/bosch_automotive_handbook_7th_edition_free_download.pdfIn PDF document text
    • https://0e8f88b9-656e-4b05-9cd8-8bd477f85547.filesusr.com/ugd/95b9ea_25ca33e1989d4df4b3f444d55b91d5b4.pdf?index=trueIn PDF document text
    • http://gixiluvigatekij.atwebpages.com/killing_joke_eighties.pdfIn PDF document text
    • https://19f621d4-ab03-49b5-bf1d-c78de40104d4.filesusr.com/ugd/bc84a3_7d6b297c5e1c4b86bad919ca26a151c6.pdf?index=trueIn PDF document text
    • https://48bd7725-9370-4d18-884e-e75d7b70c9c4.filesusr.com/ugd/f241d9_4b522caa94fd48c588de9d5156e0c53d.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/bovenotojitowe/52766621102.pdfIn PDF document text
    • https://6131fb9f-3080-406c-a6ab-c4686b6a2f6f.filesusr.com/ugd/52be6f_96cedf1025624245b425362d53beadb2.pdf?index=trueIn PDF document text
    • http://zutugidod.onlinewebshop.net/how_do_i_become_a_certified_data_analyst.pdfIn PDF document text
    • https://s3.amazonaws.com/luramamelolem/garmin_edge_510_installation.pdfIn PDF document text
    • https://s3.amazonaws.com/tujeviwakirawu/bonin.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_off0000d137.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD137 5564 bytes
SHA-256: 994eb5d2584178d5787bd6c4cc616c44ba8d9c877f67d64bf8330864567f2e93
font_01_sfnt_off0000e402.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE402 10420 bytes
SHA-256: 9be88bbe5f6f9e2bf280172909ab065ad3b89c39b33c4d7e90a15ae36bbfa854

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