Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb00eef61c81a0cf…

MALICIOUS

PDF

80.9 KB Created: 2021-03-13 21:17:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: fc5b7df97da0a2c53fffed816d560de0 SHA-1: a9d4d1bbfa66f6e43a1780b4b029eaa5c1c11f54 SHA-256: fb00eef61c81a0cfe342f488d36a35715390d09d57bd8bbae0ee042244e73445
186 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. It contains a large number of external links, many pointing to disposable domains, suggesting a link farm or SEO spam operation. The primary external URL, https://druttle.ru/strik?utm_term=relion+confirm+blood+glucose+meter+instructions, is likely part of this scheme to drive traffic. No scripts were extracted, but the PDF structure and heuristics strongly suggest it's designed to redirect users to malicious or spam content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://druttle.ru/strik?utm_term=relion+confirm+blood+glucose+meter+instructions PDF link annotation
    • http://peregukejipesa.iblogger.org/33569163598.pdfIn PDF document text
    • https://cdn.sqhk.co/nasubivapu/g8ViMun/komiwatax.pdfIn PDF document text
    • https://cdn.sqhk.co/tubadaluzafu/qTgfheP/home_network_switch_vs_router.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/b1750483-dd0b-4320-967f-ecc0e3995188/canon_ae1_vs_ae_1_program.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/19013a21-5f65-4f52-964a-871379f6f35b/70257698337.pdfIn PDF document text
    • http://wuxodevidupibe.epizy.com/metal_gear_solid_2_substance_gog.pdfIn PDF document text
    • https://f733e552-90a1-4d1f-83ca-a6b36afcf31c.filesusr.com/ugd/38bf1f_3043e76e2f35473bb357ac79072df3bf.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/lakadutof/pdf_markup_software_windows_10.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/058f3171-3ce0-4d82-8977-f2da5eb66c48/47687037375.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/54c48d40-bfdd-4e61-9871-527f8d78fe1d/easy_way_to_make_homemade_wine_from_grapes.pdfIn PDF document text
    • https://ff743420-c5e2-4527-a456-70ddb2a1abd8.filesusr.com/ugd/5178f2_a07a30facc7245e8967dc4720415f27b.pdf?index=trueIn PDF document text
    • https://a121017b-3fb3-450c-9156-48dd71a9bf80.filesusr.com/ugd/07625c_a0ba27dbb3f64c9788e56ac47a8fbe9b.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xofalepelala/38092523260.pdfIn PDF document text
    • https://70fbc5f3-53e4-4072-9ff7-a5862d19847b.filesusr.com/ugd/bb3bf9_c205b87b57444af5ab907c38b95dddef.pdf?index=trueIn PDF document text
    • https://34e223d5-b18a-4f89-96b3-7c58aa965d90.filesusr.com/ugd/440e29_b17f66d1beac4126add9d93a7af4c910.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/webipejonavuv/modern_chess_brilliancies.pdfIn PDF document text
    • http://getitusedoniriv.epizy.com/hp_elitebook_8540w_repair_manual.pdfIn PDF document text
    • https://45180a89-8b92-4d54-a4c6-cdf0ad6af3c7.filesusr.com/ugd/2b98a3_43dced4c949144729c7f45a9f134e346.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jafujasiwetid/list_of_important_days_in_world.pdfIn PDF document text
    • http://bifikaximeme.epizy.com/what_are_magic_eraser_sheets_made_of.pdfIn PDF document text
    • https://ce322291-b3da-4cc2-ae0f-523e25daec44.filesusr.com/ugd/4530da_c21c762f9bcf452bbbe0eb47f42fb94f.pdf?index=trueIn PDF document text
    • https://33fe1336-4051-433c-b691-b763732126dd.filesusr.com/ugd/6c8f37_4d994cbae7d34288ac8e98724135545b.pdf?index=trueIn PDF document text
    • https://8eefcaf3-52f5-4123-8be5-b1f0aaeea45e.filesusr.com/ugd/1d3654_3ca2e52e6beb464aa1da60fc945bb491.pdf?index=trueIn PDF document text
    • http://rejosunugewojif.epizy.com/66963336085.pdfIn PDF document text
    • https://46a1ac71-481d-4a85-b709-d40f3a189542.filesusr.com/ugd/143c98_1adb0f0dc9c1483ca2e90378763ed377.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fea2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEA2 5276 bytes
SHA-256: da4533a01827af838c186d4aba593eccb0f8a0c113f72b69ed6439e727251861
font_01_sfnt_off00011086.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11086 10844 bytes
SHA-256: 10d05cd84dfc037b353ad1be4e06dc2447e467f0715dc17bc7f0ea46e9321922

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