Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4bdca465c31a22e…

MALICIOUS

PDF

77.4 KB Created: 2021-05-12 19:05:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 9fe30022486d21337fea1e9008a9b591 SHA-1: ada558fc1915cbb8d771decedaa7dcc161f6f92f SHA-256: a4bdca465c31a22e850b79968a9528f64f114a4d58e7bb8e540e678a5bd63a47
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 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://pelibifir.ru/strik?utm_term=lasko+16+oscillating+pedestal+fan+stopped+working PDF link annotation
    • http://pavajevubuj.iblogger.org/34849311324.pdfIn PDF document text
    • https://toxupuxuforiri.weebly.com/uploads/1/3/5/9/135966975/5e72a0834c12.pdfIn PDF document text
    • https://vizodifoberesin.weebly.com/uploads/1/3/4/9/134900429/ribafev-vobudufovumegak.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403819/normal_602f99b1eecdb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462708/normal_5fd9821e35bb5.pdfIn PDF document text
    • https://lagonola.weebly.com/uploads/1/3/4/8/134851586/6975067.pdfIn PDF document text
    • https://buveziketi.weebly.com/uploads/1/3/1/3/131398526/464857991f.pdfIn PDF document text
    • https://vamalogobiw.weebly.com/uploads/1/3/4/6/134696595/1417950.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4401983/normal_6039c514a80c8.pdfIn PDF document text
    • http://jetirirafu.iblogger.org/7012008539.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wefugugis.epizy.com/grounding_sheets_dangerous.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b14c361a-ffca-47f4-bb39-9b22f804157d/zubapikujoluw.pdfIn PDF document text
    • http://vuvuparitika.rf.gd/pdf_file_merger_software_download.pdfIn PDF document text
    • http://gedobesixo.epizy.com/48747355738.pdfIn PDF document text
    • http://dilegefofuz.rf.gd/keworufivunujozu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f77ae540-a7d4-4910-9e4a-e5f4f56e4df9/cyber_security_awareness_training_army.pdfIn PDF document text
    • http://nekabet.epizy.com/91007042289.pdfIn PDF document text
    • http://jilovin.epizy.com/sefin.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_off0000ef05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF05 5624 bytes
SHA-256: 0d20edb89cd8a6bab774ba79c04af3d940e4ac761938e55620a5b1a066987d45
font_01_sfnt_off0001025d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1025D 11172 bytes
SHA-256: 2ce56e40b48c8350b38aeb7f45aa58fc250287ded1b827f9431d07e0430af24a

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