Malicious PDF — malware analysis report

Static analysis result for SHA-256 3845fbeb109e3b9b…

MALICIOUS

PDF

73.0 KB Created: 2021-03-03 09:54:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 72d022a027cf7639c723fbb94e99ada3 SHA-1: da19bfbe885e4aab6d035c0a61ddddbaf6bd17ca SHA-256: 3845fbeb109e3b9b1f19f22e9463cd6db48eb0c5fa8dd533b425b48c3d3da177
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains and exhibiting link farm characteristics, strongly suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection confirm its malicious nature. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of malicious intent, likely to lure users to malicious sites.

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://soxebez.ru/strik?utm_term=machinery%2527s+handbook+31st+edition+pdf PDF link annotation
    • http://zefedupawomodos.22web.org/dasulawisuzobosunobatoge.pdfIn PDF document text
    • http://bamefidev.mygamesonline.org/2015651769.pdfIn PDF document text
    • https://guwagigiruf.weebly.com/uploads/1/3/5/3/135303004/8847260.pdfIn PDF document text
    • http://pisobadepujo.22web.org/tofuredo.pdfIn PDF document text
    • http://boviriso.22web.org/interview_guide_in_research.pdfIn PDF document text
    • https://towipikegogu.weebly.com/uploads/1/3/4/6/134690187/5782887.pdfIn PDF document text
    • https://kikoxelila.weebly.com/uploads/1/3/4/3/134335894/fokufukosibowe.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kebojupevanivi.rf.gd/52910663215.pdfIn PDF document text
    • http://vixuzuvubus.rf.gd/rixovikiwazalogonubigak.pdfIn PDF document text
    • http://nisetekotixob.myartsonline.com/84239233996.pdfIn PDF document text
    • http://zapofekeba.rf.gd/l_theme_violin_sheet_music.pdfIn PDF document text
    • https://s3.amazonaws.com/mexesazaxasa/54412618070.pdfIn PDF document text
    • https://s3.amazonaws.com/tokatefozude/4643620830.pdfIn PDF document text
    • https://s3.amazonaws.com/zugutixe/block_restricted_calls_app_android.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_off0000dd87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD87 5772 bytes
SHA-256: c31d41927b58363e4b6f8c70906a9a0aad23684c129783a3795d4f47fe3e9c5c
font_01_sfnt_off0000f145.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF145 10904 bytes
SHA-256: 9a8bdf0b513a01e8573d5cb3d9594589259b7bfeef477427870af7253bf9f3a0

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