Malicious PDF — malware analysis report

Static analysis result for SHA-256 c43df06d693567ef…

MALICIOUS

PDF

69.5 KB Created: 2021-02-19 20:53:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 7d2adab43118ac4d392127e39a0168a7 SHA-1: 41e54b2d2710d28b63c50fa29a1ddb3573348cb9 SHA-256: c43df06d693567efb1a1813b9add3e86c1124a88e9ceb7920b7b842666029fa2
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains numerous external links, a technique often used in SEO link farms to artificially boost search engine rankings. One prominent URL, 'https://bologen.ru/123?utm_term=djing+for+dummies+3rd+edition+pdf+free+download', suggests a lure for a free book download. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution, despite the absence of executable scripts.

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://bologen.ru/123?utm_term=djing+for+dummies+3rd+edition+pdf+free+download PDF link annotation
    • https://cdn.sqhk.co/datimemovuko/3TmmLgw/dewuvuwijetilawebo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4382949/normal_5fe424ba1840e.pdfIn PDF document text
    • https://dapapakutuluj.weebly.com/uploads/1/3/1/3/131384169/4818637.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421787/normal_5ff4c7bb00879.pdfIn PDF document text
    • https://cdn.sqhk.co/zexupibo/njiMEia/love_stories_books_in_english.pdfIn PDF document text
    • https://cdn.sqhk.co/segenoliz/6ghqic3/daxigotugexuvug.pdfIn PDF document text
    • https://vosilidasum.weebly.com/uploads/1/3/2/7/132740263/sukazafufebimon.pdfIn PDF document text
    • https://cdn.sqhk.co/virurewev/ahfbijZ/rexenejipenefosuxetufow.pdfIn PDF document text
    • https://cdn.sqhk.co/webuzifinuno/4Pjfsjb/america_de_mi_corazon_coco.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4365536/normal_5fdcd20dbb452.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4407724/normal_5fefc11333334.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415530/normal_5fdc384acd5a5.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/nijudow/41780158967.pdfIn PDF document text
    • https://s3.amazonaws.com/veraxawewib/uncompensated_care_cost_report.pdfIn PDF document text
    • https://s3.amazonaws.com/rafiralexezol/vomazorojepaganepipeb.pdfIn PDF document text
    • https://s3.amazonaws.com/jupoti/aerospace_industry_report_2017.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_off0000d054.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD054 5692 bytes
SHA-256: 85076ee7bde35ea45e55bf3a1a63401749da5d6a30b7f57590ea289966b39b03
font_01_sfnt_off0000e3c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3C4 10808 bytes
SHA-256: 16e9a44cad954c9dd27b7beb03ba8bfec6ff0faa4da98cd33951fbf922c80a52

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