Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f341fbf8062a7a9…

MALICIOUS

PDF

86.4 KB Created: 2021-04-08 19:09:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 804e17cad6adddfb2ee94b0877b4daf1 SHA-1: 1a435e165c6b62008b0db49fc3d5c95bffdd6ef6 SHA-256: 1f341fbf8062a7a90ad0102438320af85a9b694e2cc90508bffefa48e0f3bc97
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 0.9995

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://druttle.ru/strik?utm_term=best+selling+books+for+entrepreneurs PDF link annotation
    • https://segunimumise.weebly.com/uploads/1/3/1/0/131070895/wupovigexow-kezuximopibi-rokevinifelena-xijupilapefex.pdfIn PDF document text
    • http://dapurixid.sportsontheweb.net/mordiendo_manzanas_y_besando_sapos_completo_gratis.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366375/normal_6015fc9f8a589.pdfIn PDF document text
    • https://tefegepivovopuf.weebly.com/uploads/1/3/5/3/135311357/65bf0.pdfIn PDF document text
    • http://nenodipemuxok.mypressonline.com/lohengrin_bridal_chorus.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4382412/normal_5fcd95d4e81de.pdfIn PDF document text
    • http://berozabekep.sportsontheweb.net/story_elements_lesson_plan.pdfIn PDF document text
    • https://cdn.sqhk.co/wovegase/jg9hfha/finisugeze.pdfIn PDF document text
    • http://dunodipike.sportsontheweb.net/48535872762.pdfIn PDF document text
    • https://cdn.sqhk.co/sapamine/jXKYhar/hack_game_strike_galaxy_attack.pdfIn PDF document text
    • https://cdn.sqhk.co/kerodamajop/w70Tgha/lotixuvitekofojujago.pdfIn PDF document text
    • https://cdn.sqhk.co/gojogefe/Aijji2S/boxoziwek.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/1dd21b30-bd24-4730-aafb-d1aba323db5d/2009_maserati_quattroporte_0-60.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a5e06500-1a79-43ac-ad1d-a93063eac193/blender_beginner_tutorial_-_part_2.pdfIn PDF document text
    • https://s3.amazonaws.com/wapabefizosumi/emergency_preparedness_plan_template_for_nursing_homes.pdfIn PDF document text
    • http://davinawoguzag.atwebpages.com/jatiponizodijutofek.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ad61683b-7185-4eef-82dd-29a91fa5f67b/92512949709.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8c1552f0-bca4-46c9-ad8d-538fdc96c80f/mazudejakizategabidazum.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/50dabf18-d704-4d93-8558-c9cd378cec7a/6170032501.pdfIn PDF document text
    • https://s3.amazonaws.com/muvemasoxaji/hume_an_enquiry_concerning_human_understanding.pdfIn PDF document text
    • https://s3.amazonaws.com/zoxewudunigus/85397593733.pdfIn PDF document text
    • https://s3.amazonaws.com/wifiduxezo/sql_server_2008_sp2_standard_edition.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000107ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107CE 4992 bytes
SHA-256: 16a610ca226d31b6fbd806f3c8bdf5964876e5a7cc2ff4bcf3f8caeed44bfe58
font_01_sfnt_off000118d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118D7 10856 bytes
SHA-256: 1fd81f2c97051412a144d3162756b4ca8e34347c3440f6ec30e491bb9456f2f1
font_02_sfnt_off00013dd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DD3 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c