Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9217143b5d73563…

MALICIOUS

PDF

75.4 KB Created: 2021-03-18 19:40:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: d9bc398fe131745e6229c9bb76771283 SHA-1: eac4899ffbf27821719819ee1ef993eaae96d5be SHA-256: d9217143b5d735631d17bb756e567007d0c1770fc9c43cac179a68cb329ea8b9
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable domains, indicating a link farm designed to redirect users to potentially harmful sites. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, suggesting the document is a link farm on disposable hosting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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 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://maypoin.ru/123?utm_term=finding+slope%2523+1+graphing+method+worksheet PDF link annotation
    • https://dowamodugepaxa.weebly.com/uploads/1/3/0/7/130739159/9246462.pdfIn PDF document text
    • http://nemugub.mywebcommunity.org/data_structures_and_algorithms_in_python_solutions.pdfIn PDF document text
    • http://kazimibi.getenjoyment.net/basic_electrical_engineering_syllabus.pdfIn PDF document text
    • http://xirijapip.mypressonline.com/pdf_page_splitter_ubuntu.pdfIn PDF document text
    • https://radisowe.weebly.com/uploads/1/3/4/3/134366404/kabevolanu_gadep.pdfIn PDF document text
    • https://pozategon.weebly.com/uploads/1/3/2/6/132695347/f9e6a6ef.pdfIn PDF document text
    • https://koduxiwarutuj.weebly.com/uploads/1/3/2/7/132740502/donagi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/a62ceea6-f3c6-4e34-b329-7c6d7f1a5269/sebuzinadinufamuvubiputox.pdfIn PDF document text
    • https://s3.amazonaws.com/tobaziw/weekly_attendance_sheet_template_excel.pdfIn PDF document text
    • https://s3.amazonaws.com/tokudapele/27625548715.pdfIn PDF document text
    • http://filosoko.onlinewebshop.net/87413263284.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ff9e333d-5391-4406-9445-84761d289e3b/is_the_word_mortal_sin_in_the_bible.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8ab5a2fb-b4bb-4da2-b1cf-4501c0c2004b/32261586251.pdfIn PDF document text
    • https://s3.amazonaws.com/rupatojuko/gijebuxudefujatinorana.pdfIn PDF document text
    • http://kojenixerog.myartsonline.com/how_to_use_total_gym_ab_crunch.pdfIn PDF document text
    • https://s3.amazonaws.com/vavapekadoliti/bullet_force_game_free_for_android.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bc5aa8b9-93a7-4c9b-9dd0-0b0cc29199b6/sirebisetopulemexi.pdfIn PDF document text
    • https://s3.amazonaws.com/vibuvomomuv/99635462273.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d857f281-d436-4f2a-a778-9f4b2b0746b7/how_to_unlock_zte_mf90_airtel_4g_hotspot.pdfIn PDF document text
    • https://s3.amazonaws.com/jivuxo/what_is_another_word_for_groups.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_off0000ea41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA41 4776 bytes
SHA-256: 8fd8a1b8f10afb001afc7ce938c99744ae1ea27148b7a79d79a861c1a53116d6
font_01_sfnt_off0000fa9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA9D 10808 bytes
SHA-256: 0d8e6282f74da67843b556c762745a091eb0b4a26bd20283ed77e87737c17b6d