Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6bde434e6a8d423…

MALICIOUS

PDF

74.3 KB Created: 2021-03-03 19:29:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: f9e8cc74fde0c9738e1c7020c348b40f SHA-1: d8c8b06f290c6b0db06759d42bcb75c429450495 SHA-256: d6bde434e6a8d423eb8c2ec6c1004ca120238b9187d769fba009e60ea88c3d69
126 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a machine learning model and ClamAV, as malicious. It contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm designed to redirect users to potentially harmful content. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic specifically indicates a non-clustered link farm on disposable hosting, reinforcing the malicious intent.

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 is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://maypoin.ru/wix?keyword=papa+pear+saga+mod+apk+unlimited+gold PDF link annotation
    • http://tifebozazam.iblogger.org/value_investing_coming_back.pdfIn PDF document text
    • http://jilet1.club/muxoribetipelobokotitij1t7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444114/normal_5fe8aaf99608f.pdfIn PDF document text
    • http://jivusibofonefud.mygamesonline.org/japanifo.pdfIn PDF document text
    • http://life-news.tech/what_does_management_skills_meanmsyae.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489993/normal_603391c2b6227.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369318/normal_5fe77bb869334.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4482623/normal_60043ca5490af.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407081/normal_600a677a2f1b8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4424985/normal_5fca6eafc7955.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://xugomoxuniwemo.rf.gd/the_young_elites_google_drive.pdfIn PDF document text
    • http://vobulag.rf.gd/repinenafovuboza.pdfIn PDF document text
    • https://s3.amazonaws.com/zakunafu/delta_h_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/purawuma/malaria_prophylaxis_guidelines_malaysia.pdfIn PDF document text
    • https://s3.amazonaws.com/laginekux/fimowefowok.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d829.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD829 5228 bytes
SHA-256: de4896cccc877aaf7e0efe40607a38a0659c9f35e54568d32e4180f47a0c517c
font_01_sfnt_off0000e9d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9D4 10536 bytes
SHA-256: 0a37675ca78dc097a72801afc144bd1858df73933ac0ebbe5af9a25380413050
font_02_sfnt_off00010ded.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DED 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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