Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d637bb05dbeff75…

MALICIOUS

PDF

177.4 KB Created: 2021-04-04 21:29:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: b7da62dbd30fe4aee64e41bfa7512f9b SHA-1: e7dbea2820e0085033109117df67d95184de4a1a SHA-256: 7d637bb05dbeff75ade212476baba6d38c16b7291e700780714f37f8dea32cf8
166 Risk Score

Malware Insights

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

The PDF contains multiple heuristics indicating malicious intent, including suspicious links and ML classification. The document body, though heavily obfuscated, suggests a lure related to 'arrangement of teeth pdf'. The primary malicious activity observed is the redirection to suspicious domains hosting further malicious content, likely a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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
  • Image-heavy PDF with invisible link to suspicious domain high PDF_SUSPICIOUS_LINK_LURE
    PDF is a small image-heavy lure with invisible link annotations that send the user to a suspicious high-risk-domain URI. This matches credential-phishing carriers where the visible document is only a prompt and the real collection flow happens on the linked website.
  • 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://vilenefex.ru/123?utm_term=arrangement+of+teeth+pdf PDF link annotation
    • http://managerprogram.live/35499776752gjd9g.pdfIn PDF document text
    • http://pubgucbayim.com/los_4_personajes_mas_importantes_de_la_independencia_de_estados_unidoswemjw.pdfIn PDF document text
    • http://kukushka.space/vegudimuxogipajhyy3t.pdfIn PDF document text
    • http://helplnstagramcontact6088756.com/funubutatugoziwoxo974j2.pdfIn PDF document text
    • https://lomofoxagut.weebly.com/uploads/1/3/4/5/134524577/jotapeserixed.pdfIn PDF document text
    • https://susejovidexoxi.weebly.com/uploads/1/3/0/7/130775922/fibuwijopubew.pdfIn PDF document text
    • https://vidajubobulixi.weebly.com/uploads/1/3/4/6/134650234/8328976.pdfIn PDF document text
    • http://honbiz.pro/h_o_w_full_formzmep7.pdfIn PDF document text
    • http://normal-id.com/math_worksheets_for_grade_2_addition71ygb.pdfIn PDF document text
    • http://presente-top.store/stihl_weed_eater_string_replacementxxd3s.pdfIn PDF document text
    • http://expressvpn.store/ditufakuwugivofasokafuda9c07p.pdfIn PDF document text
    • https://basitonivi.weebly.com/uploads/1/3/4/5/134584834/pilenetizikura_mumozivupakuk_rofebolopi.pdfIn PDF document text
    • http://opt05.ru/triple_bottom_line_reporting_examplesi3q5o.pdfIn PDF document text
    • https://niritopep.weebly.com/uploads/1/3/4/6/134634222/tetevora-xakiranewewem-sibukowatipurol.pdfIn PDF document text
    • http://letxxnx.org/gamemaker_studio_2_platformer_tutorial_dndrybkh.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/zobuwubedak/maytag_6_000_btu_window_air_conditioner_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/24f94e05-dbfc-40e0-a47f-b66348ab227a/zelda_ocarina_of_time_walkthrough_n64.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2a7ff1dc-4068-4296-8b25-3e0b594c17c7/pillars_of_eternity_ps4_beginners_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/tidigudetefumof/fabanasi.pdfIn PDF document text
    • https://09ec9d85-9312-4337-94d0-b84080e05f2e.filesusr.com/ugd/ac0094_1f75e5cc4dd7447c83a2e89b06345e3a.pdf?index=trueIn PDF document text
    • https://6f0a4cb5-9dca-4919-8d1f-05cba15fa13e.filesusr.com/ugd/d55797_22009ddf4ca94d30b5bde9f041d4beef.pdf?index=trueIn PDF document text
    • https://7be326e9-a1fd-4761-a84c-83c904220737.filesusr.com/ugd/37e945_299c44ed829548888660dc3e28412bf8.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wupiwupiwot/how_to_cook_a_turkey_with_a_convection_oven.pdfIn PDF document text
    • https://b1706aec-e9b1-4c6c-9a93-f14ef4a1c402.filesusr.com/ugd/3b47cb_e6c34bde01174d21987d8c250f62aaa2.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/aa53508a-198e-489a-b62a-2d653f6f3276/2991003017.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4ee72c27-bbc7-4f88-bd54-5f82dea87e03/toro_weed_wacker_fuel_line_replacement.pdfIn PDF document text
    • https://s3.amazonaws.com/vinejivunitego/78987211224.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_002_off0000ff85.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xFF85 120780 bytes
SHA-256: 7b38c93f0802976a8109280aebf9098dbcf978d461ce0c2be3080391d47f080a
font_01_sfnt_off00026600.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x26600 5236 bytes
SHA-256: 9beaef2fa4a7c178af50d6fb1579aac63945eafa55e5e4c4db9d905ddb04b6e2
font_02_sfnt_off000277aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x277AA 11456 bytes
SHA-256: 2b42ecc9a0c92d5703709f143b68123d931a5d23ece51ff2668092f581a4def8
font_03_sfnt_off00029f0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x29F0A 16264 bytes
SHA-256: b5457af9b5e012ef97043a658d71e169861154de8a6f4bb9c1462e34426c9a19