Malicious PDF — malware analysis report

Static analysis result for SHA-256 0ba2210cf257692e…

MALICIOUS

PDF

73.8 KB Created: 2021-02-13 14:18:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: e2bb7d1d87fbf121e7a88d5df8823008 SHA-1: e0d9a293d4e65fb0af2e11b15d3daaa127fdce51 SHA-256: 0ba2210cf257692e61060e20f30605402e3269f173130e84816905128a0c5762
126 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The presence of numerous external URIs, many pointing to disposable hosting, suggests a link farm designed to redirect users to potentially malicious content. The document body, though heavily obfuscated, contains metadata related to its creation, but the primary threat appears to be the embedded 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://jottigo.ru/wix?keyword=ap+physics+1+equation+sheet+2020 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4486042/normal_60240665526c5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490377/normal_6027ada57e7c5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4371812/normal_5fcf30bff0362.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465564/normal_60012b46eff92.pdfIn PDF document text
    • https://cdn.sqhk.co/pupevadojas/C0qibia/kuzuxurorozuxijew.pdfIn PDF document text
    • http://setovewurepenu.22web.org/miwusu.pdfIn PDF document text
    • https://cdn.sqhk.co/jemowevu/ydzhih2/30290798983.pdfIn PDF document text
    • https://gilasagajeradek.weebly.com/uploads/1/3/4/6/134632792/7e1cb8c981071.pdfIn PDF document text
    • http://verezitabel.66ghz.com/celulares_android_baratos_telcel.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375703/normal_5fe75a7fccf53.pdfIn PDF document text
    • https://cdn.sqhk.co/zodenizekija/3nNO5D7/44261924394.pdfIn PDF document text
    • https://cdn.sqhk.co/kamavedes/jaNheie/61734377792.pdfIn PDF document text
    • https://cdn.sqhk.co/zifeduwa/iaRieji/exploration_place_coupons_wichita_ks.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/xakusineba/acrobat_reader_linux.pdfIn PDF document text
    • https://s3.amazonaws.com/farefasejikap/domegumij.pdfIn PDF document text
    • http://vefagukolile.epizy.com/animated_splash_screen_android_studio.pdfIn PDF document text
    • http://duvufewitopemaw.rf.gd/togoxirozama.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e4f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4F1 5436 bytes
SHA-256: ead6e3c4d3d405dc940f3a872fb783699528030cad49036c9dc9235c86e479eb
font_01_sfnt_off0000f785.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF785 10148 bytes
SHA-256: 565b538931101c33d5d1cbb13208830991e7f29554dbfc285724565311a2ef8f

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