Malicious PDF — malware analysis report

Static analysis result for SHA-256 2edc818478c65040…

MALICIOUS

PDF

67.7 KB Created: 2021-01-22 17:45:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 43f48701446e0e503f5128bccb251f92 SHA-1: e27fcabb1123ae51d1965d0d2d83c6264fa3c71f SHA-256: 2edc818478c65040db9f9e158f33bfeafc0a79888ea8e5e1bf495c44572c7781
126 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics indicate it functions as a link farm, directing users to multiple external URLs, one of which is associated with a phishing lure related to 'wild spirit tires'. The document body, though heavily obfuscated, contains references to 'wkhtmltopdf' and 'encyclopedia_britannica_replica_set.pdf', suggesting a deceptive pretext for redirecting users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://trafffi.ru/123?utm_term=wild+spirit+tires+275%252F65r18 PDF link annotation
    • https://cdn.sqhk.co/fuwufupi/hggxhfk/1768_encyclopedia_britannica_replica_set.pdfIn PDF document text
    • https://kefenatab.weebly.com/uploads/1/3/4/8/134854159/megidiko.pdfIn PDF document text
    • http://gugatem.22web.org/ignou_b._ed_entrance_exam_form_2018.pdfIn PDF document text
    • https://cdn.sqhk.co/jigavozef/qylje0S/flight_simulator_2020_planes_with_autopilot.pdfIn PDF document text
    • https://cdn.sqhk.co/bomemenun/S0jhkgg/44386401133.pdfIn PDF document text
    • https://site-1177369.mozfiles.com/files/1177369/escape_room_the_apartment_game_walkthrough_level_2.pdfIn PDF document text
    • http://menazubuta.iblogger.org/issue_escalation_process_template.pdfIn PDF document text
    • http://kufemotobenin.66ghz.com/battle_of_dazar_alor_heroic_raid_guide.pdfIn PDF document text
    • https://site-1245026.mozfiles.com/files/1245026/baby_kiss_hd_photos.pdfIn PDF document text
    • https://jimivisimobud.weebly.com/uploads/1/3/4/9/134901817/vijiziwem-kabuzejubonokum.pdfIn PDF document text
    • https://site-1180945.mozfiles.com/files/1180945/57913539194.pdfIn PDF document text
    • https://site-1176572.mozfiles.com/files/1176572/jr_tokaido_shinkansen_ticket_price.pdfIn PDF document text
    • https://site-1174886.mozfiles.com/files/1174886/98642330423.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wujukigow.rf.gd/dispositivos_de_almacenamiento_secundario.pdfIn PDF document text
    • http://vekujekodabudu.epizy.com/39527636509.pdfIn PDF document text
    • http://mumupaju.epizy.com/cuneiform_foot_anatomy.pdfIn PDF document text
    • https://s3.amazonaws.com/mejobu/acrobat_reader_9_for_windows_10.pdfIn PDF document text
    • https://s3.amazonaws.com/tinivukedeta/pimokunokirape.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_off0000ca0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA0A 5528 bytes
SHA-256: 3302ba1224d3af9d1a8e709e7be6fa5364576aac91d401efae5455c92c301c05
font_01_sfnt_off0000dd08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD08 10892 bytes
SHA-256: 85561b2f2d2fa8964ad977f6dc817a6dda055480af4be05fa569038c705fb736

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