Malicious PDF — malware analysis report

Static analysis result for SHA-256 6efc370aa5fa9399…

MALICIOUS

PDF

79.1 KB Created: 2021-05-25 02:49:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 35b484dcdaa53f75038158c049d22425 SHA-1: 54ce9982c14076d65c6c68964ccc635f0e629e99 SHA-256: 6efc370aa5fa9399fdbf35365e04fc8f3a0888dca21071cb22e364caa2bcdcaf
156 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. 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 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 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.
  • 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://seumenha.ru/strik?utm_term=articulos+definidos+e+indefinidos+en+ingles+ejercicios+para+ni%25C3%25B1os PDF link annotation
    • https://bixugukov.weebly.com/uploads/1/3/2/6/132680808/841627a2196bb.pdfIn PDF document text
    • https://namonivet.weebly.com/uploads/1/3/4/4/134493383/kalumuwavixil.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/dfc3f56b-38ae-4cca-abba-7147bf2ad575/xl_big_green_egg_corner_table_plans.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/99e7c288-ddcc-4cd6-97eb-83f34146679a/the_consolation_of_philosophy_victor_watts.pdfIn PDF document text
    • https://s3.amazonaws.com/rufonali/el_pequeo_vampiro_en_peligro_descargar.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b89b33b5-e8d2-4251-ac2c-941aeb8bc715/the_power_of_love_-_frankie_goes_to_hollywood_song_meaning.pdfIn PDF document text
    • https://s3.amazonaws.com/vetamedisoz/even_and_odd_trigonometric_functions_worksheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f7976d85-224f-402b-b083-aa049c422b5e/99487840910.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cf27767f-9cfe-4124-9a0f-d5a6413dfba0/95288337760.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/58c4cb51-b82c-48f6-bb32-847b60ef5fed/maiden_voyage_meaning_synonym.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/531294cc-4ca5-4787-a5db-0fff9e451570/47554385457.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a7c1f089-eb3a-45cc-a659-ad140dd2da11/how_to_turn_on_heater_in_house_honeywell.pdfIn PDF document text
    • https://s3.amazonaws.com/jutenojamega/cutting_edge_upper_intermediate_book.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7d7e16d9-1371-4b64-82f9-3fb26c1b2d3e/98081703588.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/49d7b1ed-c6ef-441c-b91d-986e6723e5a9/dell_laptop_e6410_keyboard_not_working.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a58d688c-a7ef-4deb-9fbd-85e0826f66c4/vimilevunije.pdfIn PDF document text
    • https://s3.amazonaws.com/nefomojuwet/85989717873.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/be967420-f885-4e4f-b2e2-a5bba6c5883d/practice_sat_essay.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bd9c43a0-92be-4bd3-944d-afdf9dd146bc/4692297639.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_off0000f108.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF108 5600 bytes
SHA-256: 016fb5f152e8684bdbd45cd6a14036cbb3c7332444d36b4ea2583a0c596f77d3
font_01_sfnt_off000103e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103E6 12160 bytes
SHA-256: 3fe8485e076cbe48c57925693e98595bcbc6194ca31060cfe91274c82be16216

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