Malicious PDF — malware analysis report

Static analysis result for SHA-256 2e72f14da24086cd…

MALICIOUS

PDF

82.0 KB Created: 2021-04-01 08:49:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: fe3c02d04a5ba033a2c54745b5b4529a SHA-1: b65900b1b2bf38a869000a61af97962eabe95264 SHA-256: 2e72f14da24086cd2e45a17987de89e05724cc71297284407c06b5b5ad6e2257
146 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses a callback-phone (TOAD) lure. 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 0.9998

Heuristics 6

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://jacksth.ru/strik?utm_term=how+to+answer+interview+questions+for+customer+service+position PDF link annotation
    • http://giviwopifa.22web.org/how_to_use_splat_10_wash_hair_dye.pdfIn PDF document text
    • http://leledup.mypressonline.com/how_long_does_honda_car_service_take.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481067/normal_5fd32912ac3bd.pdfIn PDF document text
    • http://on-arenas.com/88486762752wb7wb.pdfIn PDF document text
    • http://tokexal.medianewsonline.com/kogibiguzenos.pdfIn PDF document text
    • http://novonet.online/tunufewenifanerojexeluzodko.pdfIn PDF document text
    • http://veruvipavopa.getenjoyment.net/is_there_an_online_version_of_ms_project.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457305/normal_6039a3b3bf1a3.pdfIn PDF document text
    • http://rukaranu.22web.org/12559762839.pdfIn PDF document text
    • http://tryne.xyz/editable_name_handwriting_worksheets1v93m.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420432/normal_60147eb592a39.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://d56a38bf-d62e-453c-9b5b-5b2fe88aea46.filesusr.com/ugd/359e64_635b0a7c8f9944e2a381b15033151eab.pdf?index=trueIn PDF document text
    • http://vobewegogiz.rf.gd/beat_saber_custom_songs_list.pdfIn PDF document text
    • http://maridilalo.rf.gd/el_astronauta_de_palenque.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5397362f-0037-43ea-85be-c364a389a4b7/27894969367.pdfIn PDF document text
    • http://wajalapivibobi.epizy.com/zowotinuv.pdfIn PDF document text
    • http://jatoxat.atwebpages.com/acupuncture_points_book.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/89b9523e-c097-4eee-a3b0-81eadaec79de/samsad_bengali_to_english_dictionary_free_download_for_pc.pdfIn PDF document text
    • https://f499a9ea-5579-4d3c-a180-ba191067f9b7.filesusr.com/ugd/34ec99_84136ff211de49438e176d3e121549e4.pdf?index=trueIn 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_off0000f25e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF25E 5248 bytes
SHA-256: 78b55bbec0724a7a625f800b0ca181bcda9503486051e0e982ea3ee16c0d2968
font_01_sfnt_off0001043d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1043D 11720 bytes
SHA-256: 0d0f2a6f376571fefa5f3d5ff72cd21f4d930eb69e1631616b26134a552622ea
font_02_sfnt_off00012c0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C0E 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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