Malicious PDF — malware analysis report

Static analysis result for SHA-256 e193b8cd27b25a98…

MALICIOUS

PDF

71.6 KB Created: 2021-02-23 20:49:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 7ba1a074efab406a79514c68d072d59a SHA-1: 148250f8547c4f3075046cbf634728b4c339e6fa SHA-256: e193b8cd27b25a98e2ec2a51782c2c6e7c5f1922799c6c9a63bd51589f8ea2ce
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. The heuristic 'PDF_SEO_LINK_FARM' indicates the presence of numerous external links, with one prominent URL being https://leonvi.ru/123. This suggests the document is designed to redirect users to potentially malicious websites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://leonvi.ru/123?utm_term=m-audio+keystation+49+garageband PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4469827/normal_601ec15529e5f.pdfIn PDF document text
    • https://cdn.sqhk.co/jabosuve/hdyAidK/jifiruvuzi.pdfIn PDF document text
    • https://cdn.sqhk.co/tadeketoxab/dLNZiOw/era_of_celestials_mod_apk_android_1.pdfIn PDF document text
    • http://xazerakovewule.22web.org/3249543878.pdfIn PDF document text
    • https://disovipogazita.weebly.com/uploads/1/3/1/3/131398104/1784288.pdfIn PDF document text
    • https://cdn.sqhk.co/wosipuvetot/hiWwhih/xunogilununidofifufe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450730/normal_603534d007a54.pdfIn PDF document text
    • https://cdn.sqhk.co/pubodegosog/5DRiD77/asana_theme_documentation.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4500429/normal_5fc9ab091c6c8.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/xedewofuretujo/30421772010.pdfIn PDF document text
    • https://s3.amazonaws.com/vunizi/physiologie_de_l_appareil_gnital_fminin.pdfIn PDF document text
    • https://s3.amazonaws.com/viwoxuz/wufesikidegaw.pdfIn PDF document text
    • http://sivigowukom.epizy.com/bupidasotavokezerat.pdfIn PDF document text
    • https://s3.amazonaws.com/jenisozazewubo/gene_therapy_definition_yahoo_answers.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_off0000db51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB51 5548 bytes
SHA-256: 8c5e53b5ccebb812827f6baef25cae395e971f8e349caac9b4e647a9f9c11c35
font_01_sfnt_off0000ee64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE64 10428 bytes
SHA-256: 24fc7f69e9bd4450a45842dc99625a8b9a8bc9af794cbba20c6f96f064a9b8d7

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