Malicious PDF — malware analysis report

Static analysis result for SHA-256 41f667489fc54c69…

MALICIOUS

PDF

74.4 KB Created: 2021-03-20 16:45:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 8c6ac049346e17791ac64b4dbef7b9e7 SHA-1: dcfaf6f898b02f40f7723b61e61d2d41dea7866a SHA-256: 41f667489fc54c690f88f9eb89426b35119d7e7bf2d79d3825d8beb90de82430
244 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file is identified as malicious by multiple heuristics and a machine learning classifier, indicating it's a phishing or trojan attempt. It contains numerous links to external websites, many of which are hosted on disposable domains and redirect to malicious infrastructure, such as the URL https://dafemum.ru/wix?keyword=kryon+2020+july. The document body, though heavily obfuscated, suggests a lure related to 'Kryon 2020 July'. No scripts were extracted, but the PDF structure itself facilitates redirection to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://dafemum.ru/wix?keyword=kryon+2020+july In PDF document text
    • http://sozaxesugoj.mywebcommunity.org/59778373606.pdfIn PDF document text
    • http://ridovise.sportsontheweb.net/positive_psychology_and_recovery_movement.pdfIn PDF document text
    • http://jarowulizose.sportsontheweb.net/causes_of_procrastination_among_students.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://af18ad75-7652-4b25-b9e0-8da5fded0af1.filesusr.com/ugd/529385_40d2afe3f89e43d597924966b82c11a5.pdf?index=trueIn PDF document text
    • https://770ad53b-b55e-4e58-b1eb-3709f41304f7.filesusr.com/ugd/98e298_b2981a5129904bfe9c1fcab1a0de313d.pdf?index=trueIn PDF document text
    • http://mebijatow.rf.gd/fusukazupezidupupob.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3be40441-ae40-4a98-9461-1c42a56578e4/how_much_does_acura_b13_service_cost.pdfIn PDF document text
    • https://5e73d190-47a4-4ead-99bf-7e9069f06a16.filesusr.com/ugd/55cc32_d7ca7745e32f477ea9d47481be177367.pdf?index=trueIn PDF document text
    • http://vexabimumemig.atwebpages.com/15510658397.pdfIn PDF document text
    • https://a7176590-a44a-43b4-8b25-1171fb6190ac.filesusr.com/ugd/e6ccb8_a92ae5a640d649639b4d44680d2fd6c7.pdf?index=trueIn PDF document text
    • http://zulonojaminipe.rf.gd/future_value_annuity_table.pdfIn PDF document text
    • https://3745348a-78a0-42d7-8ff4-af2b45bf5faf.filesusr.com/ugd/02631b_4a829dba65a3460898d909654272bd6f.pdf?index=trueIn PDF document text
    • https://7043ee2c-bc2d-4d46-b82c-b0075177c1aa.filesusr.com/ugd/f862b5_ec85a8ae6d53475694bb356cca06b3ef.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/7f29f189-4afd-41bb-a717-9637173bbdad/47846146996.pdfIn PDF document text
    • http://rilerulijomowam.rf.gd/change_bitmap_image_to.pdfIn PDF document text
    • http://moxapowi.myartsonline.com/tipos_de_planeacion_estrategica_tactica_y_operativa_ejemplos.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/13b05343-96fb-4415-ba1e-4e9505eb2590/kwikset_909_smartcode_deadbolt_manual.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_off0000e72f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE72F 4712 bytes
SHA-256: 4decb2cfa5eee3e4a00044ccfeaa094a21a75f69fca6c84547e4ede2f5eb0f84
font_01_sfnt_off0000f75c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF75C 11164 bytes
SHA-256: 517901f79eed047eb7fc576c0d20cd4b029dc443a26442ac0e341e8ac898ef56

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