Malicious PDF — malware analysis report

Static analysis result for SHA-256 9767803361ff07cd…

MALICIOUS

PDF

80.8 KB Created: 2021-05-01 22:40:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 6281044a7f6503bb4a264e1e86dc7f8c SHA-1: ced1574c7c2402dd55d6aceade452de6c44f92a9 SHA-256: 9767803361ff07cd4746742e293c0694d03957dbe128cba272e2095a62c879ae
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains, and is flagged by ML and ClamAV as malicious. The document body, though heavily obfuscated, appears to be a lure related to 'sinktop switch' installation, directing users to a suspicious URL. The presence of embedded JavaScript, though not directly analyzed here, is a common technique for exploiting PDF vulnerabilities or redirecting users.

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 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://xezojetit.ru/strik?utm_term=how+to+install+insinkerator+sinktop+switch PDF link annotation
    • http://cooldomen.space/868831164758203f.pdfIn PDF document text
    • http://ketaton.mywebcommunity.org/the_animal_that_therefore_i_am_bea_de_visser.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379234/normal_606022b3cf732.pdfIn PDF document text
    • http://electriccannoz.club/is_it_safe_to_put_crystals_in_candlesc4k7r.pdfIn PDF document text
    • http://sis-paypal.com/mb_da061_087l_motherboard_manual275ty.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471236/normal_60299ddb86add.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4492278/normal_6057ba8564f40.pdfIn PDF document text
    • http://profaudit32.ru/bezubaan_kabse_song_pagalworld6z1q1.pdfIn PDF document text
    • http://bixaxivajujojar.mypressonline.com/how_to_reply_professionally_to_a_thank_you_email.pdfIn PDF document text
    • http://lapiwudoxavov.scienceontheweb.net/environment_and_ecology_notes_for_aktu.pdfIn PDF document text
    • https://tivizaxif.weebly.com/uploads/1/3/1/3/131381605/kobukomijipojor.pdfIn PDF document text
    • https://dojibabebane.weebly.com/uploads/1/3/2/6/132682208/wemurozojoru_gadujojaku.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481671/normal_5fc56c8007c6a.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://uploads.strikinglycdn.com/files/1a80a6c9-6676-47fd-8967-29aa51d2cbc8/65919217367.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/62da2e1c-59ab-4ad9-bdbd-4ed26e7d43c1/vewasapesur.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6c42fdd9-cff6-4203-8f62-f56e36c660cc/pobaxotutigidamumarofafir.pdfIn PDF document text
    • https://b1c30c75-ab46-439a-884d-3836ae4b8a49.filesusr.com/ugd/2d1648_7607794313c6409cbd7da0b8af37d3c8.pdf?index=trueIn PDF document text
    • https://9de673a2-3b8e-40eb-bbf5-c0ad8e71a3da.filesusr.com/ugd/bd5c68_f841d345fcaa4145b507b74270f14927.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/3ed99669-edec-40d4-a412-14b4e996beb9/imagen_de_los_13_signos_del_teatro.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f194.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF194 4924 bytes
SHA-256: 4ca7e74e2ebe67390721bf177c36ea6c39104a99c762f89d5a52f1d8315dcfac
font_01_sfnt_off0001024a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1024A 10876 bytes
SHA-256: 30645429e5593c91c99c28aa0236f6333c6b782d8cc5f32163722093121619a6
font_02_sfnt_off0001278a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1278A 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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