Malicious PDF — malware analysis report

Static analysis result for SHA-256 c660bc035af65f8e…

MALICIOUS

PDF

74.0 KB Created: 2021-05-14 05:53:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 63367aabbd8f2b900529a5380ea3f9d7 SHA-1: f690f88cb4fa5e2b13db749fe7edb0f88333e620 SHA-256: c660bc035af65f8e844687ef77d64e0ff0574cafc3983044b314439d580c16a8
126 Risk Score

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to disposable domains and link farms, suggesting a phishing or malware distribution scheme. The presence of external URIs and link farm heuristics strongly suggests the document's purpose is to redirect users to malicious sites.

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/strik?utm_term=2nd+grade+geometry+worksheets+free+printable PDF link annotation
    • http://xazapefunel.getenjoyment.net/genanadusetunopamipabomo.pdfIn PDF document text
    • http://storezone.info/mokoluzim12i0y.pdfIn PDF document text
    • http://xelamoxadavas.mywebcommunity.org/sigojenibazoguranidif.pdfIn PDF document text
    • http://usmileofficial.site/the_fiery_heart_bloodlinesq6fu5.pdfIn PDF document text
    • https://falopizesolirod.weebly.com/uploads/1/3/1/3/131379111/ed994bb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485942/normal_5fcebecb3fe00.pdfIn PDF document text
    • https://fovevirikat.weebly.com/uploads/1/3/0/7/130775443/ratiruxunaziwogaros.pdfIn PDF document text
    • https://cdn.sqhk.co/gixedomawa/igcgj9a/easy_christmas_table_decorations_pinterest.pdfIn PDF document text
    • http://compte-cmbretagne.best/how_many_calories_are_in_a_matcha_green_tea_frappuccinop88uz.pdfIn PDF document text
    • http://devivitonewe.sportsontheweb.net/jejupek.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467318/normal_60527a8f1fd2f.pdfIn PDF document text
    • https://cdn.sqhk.co/vuwibagula/Ojg3VLH/9947522437.pdfIn PDF document text
    • https://fulojexerewo.weebly.com/uploads/1/3/5/3/135345176/2918327.pdfIn PDF document text
    • http://usblighter24.site/biwiburamuxitazodomugewaz19xnt.pdfIn PDF document text
    • https://cdn.sqhk.co/mepofazobi/DWgi6hh/26750353900.pdfIn PDF document text
    • https://lejumapufa.weebly.com/uploads/1/3/4/6/134688193/padaxaximepex_guropusi_siralipol_puved.pdfIn PDF document text
    • https://bexusisase.weebly.com/uploads/1/3/4/5/134596812/d4afcac2288.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480414/normal_6033321081112.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4477863/normal_5ff8bf6b0c3ce.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000e141.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE141 5892 bytes
SHA-256: b47405a66bd639119949373a87e396f475a532cbb12ad619ef9fad4d627c350b
font_01_sfnt_off0000f53c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF53C 10944 bytes
SHA-256: 3827e8e726c21cba0f1fb93718b19897664a7ca9cc4beb0cc3fdee8d955c8b9d

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