Malicious PDF — malware analysis report

Static analysis result for SHA-256 26e712b31cc02675…

MALICIOUS

PDF

85.9 KB Created: 2021-06-08 05:42:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 6b1601a925ea8a953b89941e35a8fc33 SHA-1: cee484bd96e820b6e9f5df1ea6e337bf986138c1 SHA-256: 26e712b31cc0267503140804c4b5fc7a38f5811bcb87c117aa55b067ad7852f1
186 Risk Score

Malware Insights

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

This PDF sample was flagged by multiple heuristics as a link farm, containing numerous external URLs pointing to other PDFs. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for SEO manipulation or phishing. While no scripts were explicitly extracted, the PDF structure itself facilitates the redirection to potentially harmful external content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://fokemale.ru/123?utm_term=bandura+social+cognitive+theory+of+personality+pdf PDF link annotation
    • https://veraroligesabo.weebly.com/uploads/1/3/4/3/134377370/7ce3cf630ca83c.pdfIn PDF document text
    • https://sujepofuk.weebly.com/uploads/1/3/0/7/130775011/b9e168dea.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4482230/normal_5fe427ff3f824.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365613/normal_605f952383506.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/313370c1-ae9a-4679-b5e3-1cc9de3a7bdb/mosekabupopubijed.pdfIn PDF document text
    • http://tubekikewabi.pbworks.com/f/bitujut.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/22bc2c1c-a193-4a1f-abec-92feab8b7a77/maroo_of_the_winter_caves.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ffdd1aad-1f29-4f5f-adb7-ebde3fa73f91/bushnell_yardage_pro_1000_user_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8f9b033d-402c-4746-a7bd-ff323910b965/98709052058.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f127bfed-5bcd-47bb-95fe-483493e4d07f/norwegian_getaway_deck_plan_5.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/46b9c61f-a159-45fa-8efd-0fe5656c3a8e/xutodigotexeradexosimep.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/38cddf46-9bd4-40e7-bccf-6ef0f3166c3e/discipline_priest_pvp_stat_priority.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8394aef7-fa81-44f1-829a-7a87bd53cca9/titixogigemelabozib.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/15538a48-1ee5-424c-8f3a-9125a53bf861/textbook_of_anatomy_and_physiology_for_nurses_ashalatha.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/80f65bb3-0e1b-46bc-94f2-5c6d9a196275/65252191464.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ec2e9302-ec72-4c6b-86ef-96eb71a3e1d5/1166750675.pdfIn PDF document text
    • http://pajinap.pbworks.com/f/soul_knight_secrets.pdfIn PDF document text
    • http://favixose.pbworks.com/f/12589973914.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9ee72581-64a8-461b-a954-4f85685244ab/thor_son_of_asgard_video_game_download.pdfIn PDF document text
    • http://lagawiwefe.pbworks.com/f/kitaj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/beb1641b-66fc-45df-bc40-1a90c0c88a52/how_to_reset_garmin_approach_s60.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cb916f27-9687-4887-aff0-1bbb9dbed8d9/que_son_las_mezclas_heterogeneas_para_nios.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_off00010f9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F9A 5628 bytes
SHA-256: 7d600a360bf3eaf8a6b8472db54376287db30ef08873c389ca3e10dd651c1272
font_01_sfnt_off000122d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122D0 11000 bytes
SHA-256: 0cc2803507a88102ad771babafef717fe734568376b37ba7c2ec03b3504717d9