Malicious PDF — malware analysis report

Static analysis result for SHA-256 457ff5cd438ec610…

MALICIOUS

PDF

75.4 KB Created: 2021-04-06 13:41:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 71d9cbab17491d9b9e1de312f1e99488 SHA-1: 864a7e6f4079a989ffc2fa6c0b62a2c9bf76e0ed SHA-256: 457ff5cd438ec61055a7fcc1f676501823a865b8a943c44a44b225d26500db3e
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 0.9992

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://xajibur.ru/strik?utm_term=are+beats+solo+pro+good+for+running PDF link annotation
    • http://jovekigapovokeb.22web.org/rixagirulokutubas.pdfIn PDF document text
    • http://solapp.xyz/64781973327braiu.pdfIn PDF document text
    • http://kovokowem.iblogger.org/exothermic_and_endothermic_reactions_worksheet_gcse.pdfIn PDF document text
    • http://helpcreditscore.info/wimazuvolubituwibupoptw296.pdfIn PDF document text
    • http://midakurapujif.mypressonline.com/pemigodijowelalikoxijeso.pdfIn PDF document text
    • http://kilabisito.iblogger.org/god_of_wonders_lyrics.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/a5034db5-4c8a-44b1-8940-ec60f5058707/how_to_perform_visual_field_test.pdfIn PDF document text
    • http://jaremov.rf.gd/nomitupikaguwef.pdfIn PDF document text
    • https://s3.amazonaws.com/poguvelefa/free_printable_sheet_music_music_box_dancer.pdfIn PDF document text
    • https://s3.amazonaws.com/wifukedot/free_3rd_grade_multiplication_and_division_worksheets.pdfIn PDF document text
    • http://soxarigur.myartsonline.com/level_1_reading_books_online_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/efa3ec08-ebfc-495e-9b66-6567a03c9a3c/vubizod.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e5628fb5-7afb-4c99-a929-c062a34a6834/fukiguxaboxefirana.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/74b09b94-81ba-4f87-b533-abbc06b44991/baixar_internet_explorer_9_download_gratis.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/62236639-9bd0-46ac-81b5-b9e6bc327e37/ratikonefen.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c9e6a8f7-d829-44f1-a3f3-a7747a763013/49605298451.pdfIn PDF document text
    • http://xifenarubomes.rf.gd/what_is_form_1040x_amended_tax_return.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2bf7f3f8-3767-4fe9-8432-e8435a936221/88476031497.pdfIn PDF document text
    • https://s3.amazonaws.com/bupijila/subordination_non-_disturbance_and_attornment_agreement_form.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/97c9b645-0c02-420a-b900-edeceea43c52/62161366942.pdfIn PDF document text
    • https://s3.amazonaws.com/sulasatevirexo/89505269205.pdfIn PDF document text
    • https://s3.amazonaws.com/bokelur/best_free_android_navigation_app_australia_2017.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4ddde258-654c-4a02-8837-e5d40d44c7be/36689504683.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_off0000e760.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE760 5336 bytes
SHA-256: 6b0d08a3fdd4788275e630975542b18bfe1c37ca4bc6a2f4a22686968085d816
font_01_sfnt_off0000f993.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF993 10864 bytes
SHA-256: 2eda68fc1cf34416fef761595a56eb9d8d5cb56cee59e5c819b26d0602884e74