Malicious PDF — malware analysis report

Static analysis result for SHA-256 e444f7d6055c5762…

MALICIOUS

PDF

75.6 KB Created: 2021-03-28 08:55:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 36ef104ccc18c053761283e336210efb SHA-1: dea9c17a0476ffed480a316357645ad0f3dd9247 SHA-256: e444f7d6055c5762313859eea60268710cdd3906794dc0ec1d1638155ec1a960
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 0.9996

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://mezovuduw.ru/strik?utm_term=advanced+dungeons+and+dragons+character+generator PDF link annotation
    • http://azakalaza3.xyz/29971164452hxh8f.pdfIn PDF document text
    • http://lirebuwoke.mygamesonline.org/how_to_cook_potatoes_in_my_power_pressure_cooker_xl.pdfIn PDF document text
    • http://lnstagram-helping.live/windows_7_home_premium_oa_download_izihie.pdfIn PDF document text
    • http://helpcenterbusiness.xyz/651209100798rpqt.pdfIn PDF document text
    • http://zathkatow.xyz/26902995041sxl3x.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/tejuvonixag/building_muscle_101.pdfIn PDF document text
    • https://s3.amazonaws.com/bomupi/bootstrap_4_modal_reset_form_on_close.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/04ac22f3-c09b-4f2f-8e35-5b1abb5976c4/what_is_the_best_app_for_constellations.pdfIn PDF document text
    • http://fuvuxejuv.myartsonline.com/13957281161.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c954dd6e-15fd-4f12-8f64-094a6480fdda/starbucks_cold_brew_cups_bulk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ca72f929-1f81-4d94-b017-70de57aca432/best_gravitys_rainbow_quotes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e619a398-d0be-42e6-b694-782fa90d4c19/grammar_textbook_class_6.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c1857378-cfac-4583-865a-7272721b48a9/heart_of_darkness_movie_vietnam.pdfIn PDF document text
    • https://s3.amazonaws.com/xipavir/10th_cbse_board_exam_2019_date_sheet.pdfIn PDF document text
    • https://s3.amazonaws.com/magapeguwabe/58130391323.pdfIn PDF document text
    • https://s3.amazonaws.com/sesafefanulokam/waves_maxxaudio_pro_software.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3d7f52e3-92bd-470d-8981-aa97416cd982/lct_208cc_engine_specs.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9d824417-ef41-4ea3-a4b2-2ce5235cd473/tv_input_button_not_working_on_fios_remote.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d211284b-e5a4-4336-8b57-ed87b3aafa9d/tufagalutotuva.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aa3f6dde-7476-4eb2-b42b-cf3acde57408/30257785417.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3d938b24-1372-47e7-b1b0-5b13ad7133af/zifukenegipagumudegiki.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_off0000e830.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE830 5220 bytes
SHA-256: d91c5e21e144d4280b3eb05ec4a64942caea365b2e0add4a027cc2badb83174c
font_01_sfnt_off0000f9f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9F3 11308 bytes
SHA-256: ac024d5c223a5d57f1e9d99399a63a35be7734574cf7342288021b5af8c546bb