Malicious PDF — malware analysis report

Static analysis result for SHA-256 821e0418fb77ea23…

MALICIOUS

PDF

76.8 KB Created: 2021-03-16 02:25:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: b7c992b674702761942f445509cf4f2a SHA-1: 4fab42e703474dfae7924e424e1c8e91351a9578 SHA-256: 821e0418fb77ea23ffaa4b2d71508aa6bf7fb14c0a4cf4ba8c2364c16787d9ff
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://jumiwimov.ru/wix?keyword=partes+internas+de+una+computadora+y+su+definicion PDF link annotation
    • https://gukudobubutagen.weebly.com/uploads/1/3/5/3/135306914/vegisonosenopugop.pdfIn PDF document text
    • https://vidimepimexuja.weebly.com/uploads/1/3/4/6/134626803/6667553.pdfIn PDF document text
    • https://muvusawit.weebly.com/uploads/1/3/5/3/135392745/denadekowawut_bubemofobexil_xafarorirotu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405459/normal_600df744d4071.pdfIn PDF document text
    • https://simofegike.weebly.com/uploads/1/3/1/6/131636923/58a4b.pdfIn PDF document text
    • https://litizabege.weebly.com/uploads/1/3/4/7/134713043/jaragizoxosopadin.pdfIn PDF document text
    • http://melowew.scienceontheweb.net/catholic_encyclopedia_volume_4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4467017/normal_5fee14b9e4df5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464070/normal_604e17748906a.pdfIn PDF document text
    • https://nulebuset.weebly.com/uploads/1/3/1/4/131411431/zutijewozigerubivuwe.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/nefomojuwet/photography_101_nikon_d3500.pdfIn PDF document text
    • https://s3.amazonaws.com/dufekifaral/sisowekemuxetotivew.pdfIn PDF document text
    • https://s3.amazonaws.com/doxifuba/toro_724_oe_snowblower_price.pdfIn PDF document text
    • https://s3.amazonaws.com/faduxodiwo/g._f._a._m_full_form.pdfIn PDF document text
    • https://s3.amazonaws.com/bepukuba/como_descargar_whatsapp_web_en_android.pdfIn PDF document text
    • http://tipokeviti.atwebpages.com/tobuzaziliza.pdfIn PDF document text
    • https://s3.amazonaws.com/bokelur/bad_boy_images_hd_wallpaper.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_off0000ec66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC66 5372 bytes
SHA-256: 390af6598edc3d58adb9e67608809297f23fc922010b4f7aa6d0602bb0620f71
font_01_sfnt_off0000fea7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEA7 11500 bytes
SHA-256: faae94eae5623b812961549c3f457f7eb31c66e03abb5712b2ce5bdf19d83fe8

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