Malicious PDF — malware analysis report

Static analysis result for SHA-256 1aa9eb07e871dabd…

MALICIOUS

PDF

85.2 KB Created: 2021-03-26 05:32:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 25148f1b2a7615536a3d5fd44ce85ad9 SHA-1: 13b2b3b5f7e3244f6ee2e94372e5b41ba5babde0 SHA-256: 1aa9eb07e871dabd86754f51389120af6eda2ef40820cca340e0fe77851d3d3f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9967

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://vilenefex.ru/123?utm_term=great+answers+to+the+toughest+interview+questions PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4413578/normal_602d2caf326f0.pdfIn PDF document text
    • http://fexabudobix.getenjoyment.net/audiometria_verbal.pdfIn PDF document text
    • http://zazuvivilug.iblogger.org/verizon_affidavit_form_asurion.pdfIn PDF document text
    • https://pusiruse.weebly.com/uploads/1/3/4/7/134717846/8519466.pdfIn PDF document text
    • http://zavifuvalo.22web.org/series_and_parallel_circuits_problems_worksheet.pdfIn PDF document text
    • https://wulapoledonuker.weebly.com/uploads/1/3/2/6/132695240/boxenaxadi-ninaweloz.pdfIn PDF document text
    • http://jalogeteka.iblogger.org/futura_bold_font_free.pdfIn PDF document text
    • http://luxasireku.sportsontheweb.net/types_of_aircrafts.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4453108/normal_6003b8e8d4afd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4377100/normal_5fce78641a6c2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418013/normal_605b05ee51b4a.pdfIn PDF document text
    • http://mewebewenuzotez.iblogger.org/adblock_plus_for_android_apps.pdfIn PDF document text
    • https://dewubixire.weebly.com/uploads/1/3/1/3/131398231/1460879.pdfIn PDF document text
    • http://woxuruko.medianewsonline.com/46431595861.pdfIn PDF document text
    • http://xokodiraki.22web.org/the_highwayman_poem_setting.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vewemisesafi.epizy.com/instep_sync_bike_trailer_parts.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e33cfcf6-84d1-4758-8dff-4c8a8e233b4d/polycom_soundstation_2w_analog_wireless_conference_phone.pdfIn PDF document text
    • http://kegigija.atwebpages.com/callese_y_venda_gratis.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5a0b8c52-c5fe-4e4c-915e-54222b05585a/torcon_for_tennessee_today.pdfIn PDF document text
    • http://jadivepijuga.myartsonline.com/3538397941.pdfIn PDF document text
    • http://selifesupenikiv.epizy.com/afk_arena_soren_guide.pdfIn PDF document text
    • http://depezure.epizy.com/wepufutupawosuj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f0b56a37-b20b-497c-b48e-595f309b4032/16718482817.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/533c7031-b336-4776-89ad-1717909de459/titategebebekamez.pdfIn PDF document text
    • http://kalotiwinilobiw.epizy.com/adidas_platform_black.pdfIn PDF document text
    • http://nenadizalotoj.epizy.com/seteronedexifaroxagokazi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/934bf8ce-2d52-4971-951f-92581fa8367c/singer_simple_sewing_machine.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_off00010f54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F54 5224 bytes
SHA-256: 99df3050227688815e144ca2545ad6161490115c8a84a6d29c17e21262373651
font_01_sfnt_off0001212b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1212B 10464 bytes
SHA-256: 50dbfda8a6bb7ccae46d9ead959b18120689d2808449b1844e9a5eeb6d530936