Malicious PDF — malware analysis report

Static analysis result for SHA-256 452769418fd17b77…

MALICIOUS

PDF

80.0 KB Created: 2021-03-27 23:17:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: d556f06323a267e8ae22f10ab5d263da SHA-1: 272b7389bb02e71d3c2954dc70a1f96eb50a060b SHA-256: 452769418fd17b775e302fb9fc116e439a6b8ad1aed727a34b09eb127856ee84
184 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, and it contains links to known malicious redirector infrastructure. The document body, though heavily obfuscated, appears to reference a 'complete sift study guide pdf free', suggesting a lure. The presence of embedded URLs pointing to disposable hosting and redirectors indicates an attempt to direct users to malicious sites, likely for phishing or malware delivery.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/strik?utm_term=the+complete+sift+study+guide+pdf+free In PDF document text
    • http://posurazatux.mypressonline.com/li_in_file_b_ngc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443802/normal_60157cf312e0f.pdfIn PDF document text
    • http://mazisim.mywebcommunity.org/bactrias_anaerbias.pdfIn PDF document text
    • http://gudutisiluzew.mypressonline.com/3086935697.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379374/normal_600938967dda3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4424951/normal_5fe51c65afbec.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386828/normal_6014f55d59e09.pdfIn PDF document text
    • http://wewogokuwidu.mywebcommunity.org/6431113615.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4378379/normal_5fe46ad781dd9.pdfIn PDF document text
    • http://ramidavukul.medianewsonline.com/beginners_english_lesson_plan.pdfIn PDF document text
    • http://popisazono.getenjoyment.net/15007395659.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/xapidajovaji/88583691648.pdfIn PDF document text
    • https://0f0532cb-4478-41f9-91a1-cf277c4732ec.filesusr.com/ugd/8acad3_ead9ab641fac45f0aa20bba0a956e6f3.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wegemebufojafak/abba_dancing_queen_sheet_music.pdfIn PDF document text
    • https://e20d271a-53e3-41f9-9180-d6cd5f9fd148.filesusr.com/ugd/6cfc61_ba11f43f29884a5796fe67746b327881.pdf?index=trueIn PDF document text
    • https://6f81cef9-66a2-447d-9e1d-4c0427ef15c5.filesusr.com/ugd/4d935e_8cb2b1efd096402baf773bdab34ec91b.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/kitakilesa/ufc_fight_night_158_predictions_bleacher_report.pdfIn PDF document text
    • https://9f53eded-325d-4e02-8430-7c09bd872488.filesusr.com/ugd/e04405_d01ccb75758c47b59d56a0847dc9fd54.pdf?index=trueIn PDF document text
    • https://7c3dd69e-6649-485e-b385-36acc2971cd6.filesusr.com/ugd/cf9ff1_bfcb5d77b18041b082d90022f4e705ed.pdf?index=trueIn PDF document text
    • https://bf23b77b-49a9-4bef-a898-a03cfb94aefa.filesusr.com/ugd/134172_cba13c367d9f4a46905e6efcc6051e84.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_off0000f87c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF87C 5408 bytes
SHA-256: c0b5f8a1fbb31b0402ad38731a64d8d403c065afbecbf9672e56742d749eeeac
font_01_sfnt_off00010aca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ACA 12008 bytes
SHA-256: d706e8cc83537a40af68a2946e4445856b0ed1cd979e632bf6fd101315e2c2db

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