Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4465ebde0c25385…

MALICIOUS

PDF

68.4 KB Created: 2021-02-20 12:41:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: b210ba5bf6153307bbc83cff1f71494d SHA-1: 1d63dca46298964af80082fdca6b4861669819a1 SHA-256: b4465ebde0c25385f0fb53b72be793694c31a332c24b8916b62dedb32e8b9359
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 0.9998

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://druttle.ru/wix?keyword=chapter+7+politics+in+the+gilded+age+worksheet+answers PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4378390/normal_5fee8ce77841e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370089/normal_5ff5a8e61187b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374522/normal_5fd736b83bbde.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408481/normal_6023c628c0104.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454988/normal_5fe600cbd9dc3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454182/normal_602c7a3191eea.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4529977/normal_60128e7396d01.pdfIn PDF document text
    • https://bovejivisesuja.weebly.com/uploads/1/3/1/3/131384116/62f5d8a2c91ca.pdfIn PDF document text
    • http://godevibusaxinoj.22web.org/avant_browser_for_windows_7.pdfIn PDF document text
    • https://tagopebarezixog.weebly.com/uploads/1/3/1/6/131607889/5858224.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/tobobowu/bemoboku.pdfIn PDF document text
    • https://s3.amazonaws.com/mavixu/duration_of_anticoagulation_for_dvt_guidelines.pdfIn PDF document text
    • http://zaninenuj.rf.gd/cookie_sheet_pan_dessert_recipes.pdfIn PDF document text
    • https://s3.amazonaws.com/xuzed/adaptation_in_desert_animals_information.pdfIn PDF document text
    • https://s3.amazonaws.com/rimepusox/android_app_templates_free_xml.pdfIn PDF document text
    • http://vanuragevexofe.rf.gd/hello_brother_songs_free_telugu.pdfIn PDF document text
    • https://s3.amazonaws.com/gedimuta/drawing_line_graph_worksheets.pdfIn PDF document text
    • https://s3.amazonaws.com/zevutebulaworel/bittorrent_free_for_windows_7.pdfIn PDF document text
    • https://s3.amazonaws.com/nowokil/pakifipajon.pdfIn PDF document text
    • https://s3.amazonaws.com/mokamoba/39829577385.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_off0000ce82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE82 5476 bytes
SHA-256: 88bc670829c99d1fdf8178881665e1169d8c827a0c0f9487106b62248e1d20c5
font_01_sfnt_off0000e12e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE12E 10144 bytes
SHA-256: 52e8b12a13f10ee0b3477abe042f99da15336e99f2892c7a31cfd85b803d0d66

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