Malicious PDF — malware analysis report

Static analysis result for SHA-256 75a5623a4ab183c0…

MALICIOUS

PDF

84.8 KB Created: 2021-02-20 23:44:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: 9d33773e3e40c027ecaf51bda68b143e SHA-1: ced84f8f163397201c8c4a04382cc1c55bed6405 SHA-256: 75a5623a4ab183c0f9d7c4ff4724d2e85edd69cabbf4261201859b03fd443f49
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains embedded URLs that redirect to suspicious domains, including one that appears to be a link farm designed for SEO manipulation. The document body, though partially corrupted, suggests a lure related to a 'Biddeford heated throw blanket manual', likely to trick users into clicking the malicious links.

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://seumenha.ru/strik?utm_term=biddeford+heated+throw+blanket+manual PDF link annotation
    • http://magnitoli-2ekran.site/kikabani49nta.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373999/normal_5fd5fe5a7035d.pdfIn PDF document text
    • http://gufutaca5.xyz/60935505412yc1ih.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4527859/normal_600f53050011e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474456/normal_600bd3fcb192d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366400/normal_602615138af5e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4425009/normal_5fefdf07204b7.pdfIn PDF document text
    • http://brumbum6.xyz/alfreds_piano_book_1_alpine_melodyvb3sw.pdfIn PDF document text
    • http://juilopkiretlo.ru/global_startup_ecosystem_ranking_2019_top3acc8.pdfIn PDF document text
    • http://kasyanbeauty.com/student_name_card_templatec2spk.pdfIn PDF document text
    • http://maewallace.com/the_healing_secrets_of_the_ages98pgo.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://s3.amazonaws.com/forupokisip/xikenazemobofimi.pdfIn PDF document text
    • http://xezabesazigida.epizy.com/google_chrome_extensions_from_web_store.pdfIn PDF document text
    • https://s3.amazonaws.com/lonozote/7914311245.pdfIn PDF document text
    • https://s3.amazonaws.com/wenobagupexekap/49925273282.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_off0000ff33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF33 5196 bytes
SHA-256: 4fc9a2fa49884ad2554f0f9bb719cbd83a117d22977ce01cdda24c94a84ee86a
font_01_sfnt_off000110ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110BA 11472 bytes
SHA-256: 1a0466e45e5fc4d2010bfe6d880d140e81186f2a7ac0409ca4415567f296b8c0
font_02_sfnt_off000137ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137AC 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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