Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d22ab9f489c0024…

MALICIOUS

PDF

72.0 KB Created: 2021-05-01 17:35:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: fbcd291b7f0b84f9fecf08e418b24ec3 SHA-1: 737988c79c4872cab139ea84a417760a76ffd59e SHA-256: 1d22ab9f489c00244911390703bf093448d97ca88954ac7b962caa41d4e65fa1
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, suggesting a link farm or phishing campaign. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic strongly indicate that the primary function is to redirect users to potentially harmful content. No scripts were extracted, but the PDF structure itself facilitates the redirection.

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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://xajibur.ru/strik?utm_term=safety+dance+lyrics+glee PDF link annotation
    • https://cdn.sqhk.co/buruvalufe/QhgZijJ/sutusodazagok.pdfIn PDF document text
    • https://cdn.sqhk.co/bukoxomule/eyicibo/31192258889.pdfIn PDF document text
    • https://cdn.sqhk.co/letaziseb/jhGgcuh/k12_online_school_reviews_yahoo.pdfIn PDF document text
    • https://cdn.sqhk.co/pinofizulag/grtgdCO/after_burner_climax_ps4.pdfIn PDF document text
    • https://kuvitarige.weebly.com/uploads/1/3/4/0/134095916/gegokidaw.pdfIn PDF document text
    • https://cdn.sqhk.co/gezefesete/1icjcsn/29705743662.pdfIn PDF document text
    • https://cdn.sqhk.co/demawanetufi/hejibgc/appendices_format_sample.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370533/normal_6064abef63025.pdfIn PDF document text
    • https://cdn.sqhk.co/batovafakupo/jgvTozR/atos_vr_hang_glider.pdfIn PDF document text
    • https://wovigapugup.weebly.com/uploads/1/3/2/7/132710676/a509518b.pdfIn PDF document text
    • https://fitokuzigijot.weebly.com/uploads/1/3/4/6/134681543/nijovoweliwe_vaxusewewesi_bazumawevulafar_wezowuw.pdfIn PDF document text
    • https://cdn.sqhk.co/gojaxaxiwa/jQx6Fgj/siluzumudusozupurotenu.pdfIn PDF document text
    • https://cdn.sqhk.co/mowukirew/GpKpagj/moxilalutukexagul.pdfIn PDF document text
    • https://cdn.sqhk.co/zifeduwa/6ygihd9/my_android_app.pdfIn PDF document text
    • https://cdn.sqhk.co/benibavagoge/gfpheji/hop_color_ball_3d_free.pdfIn PDF document text
    • https://cdn.sqhk.co/dasofuduveje/hgCgiGS/25382375194.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427284/normal_600f0eeca5db6.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_off0000dbd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBD4 5392 bytes
SHA-256: e7a83d6b8f30ee83dfd265718c80dbaaef2d24fa37dbdf2c47bab014be661fa5
font_01_sfnt_off0000ee46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE46 10296 bytes
SHA-256: efebdf7da3066ef79b6402651f62ba2007e2aedf86a754ad8f362ed8184ce31f

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