Malicious PDF — malware analysis report

Static analysis result for SHA-256 62454a1f4bdbb5b4…

MALICIOUS

PDF

75.3 KB Created: 2021-02-21 10:44:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: ff9f364a0f976e4421b3f422a9b7f933 SHA-1: 8c4a5ff20f60ee5cfd2529bfff101cd63cc17235 SHA-256: 62454a1f4bdbb5b4c90fd5408266adc348e3f255f4a0674bc0aa65a584b71bec
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which point to other PDF files, suggesting a link farm or SEO poisoning tactic. The primary URL, 'https://maypoin.ru/wb?keyword=pakistan%20studies%20books%20pdf%20free%20download', is designed to attract users searching for free study materials. The ClamAV detection and ML classifier strongly indicate malicious intent, likely to distribute further malware or phishing content through the linked PDFs.

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://maypoin.ru/wb?keyword=pakistan%20studies%20books%20pdf%20free%20download PDF link annotation
    • http://e-devletodeme.net/9905126782h4phg.pdfIn PDF document text
    • https://gorofegi.weebly.com/uploads/1/3/4/4/134462705/6562821.pdfIn PDF document text
    • http://pl50off.info/jaxalekosurm81ve.pdfIn PDF document text
    • http://mailedflkf.site/carry_on_luggage_weighty9ffn.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4411503/normal_5ffcd4620f00d.pdfIn PDF document text
    • http://0fruit.space/mugerobososipaqt.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4457311/normal_60062179cca4f.pdfIn PDF document text
    • https://polovetanofup.weebly.com/uploads/1/3/5/3/135330247/ripeferid.pdfIn PDF document text
    • http://doordash.link/sanoxanelojobobitamelej6fuo3.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
    • https://s3.amazonaws.com/daxemo/kewadikotol.pdfIn PDF document text
    • https://s3.amazonaws.com/dudurat/96863151009.pdfIn PDF document text
    • https://s3.amazonaws.com/pipaneku/19495134791.pdfIn PDF document text
    • http://zaritopewebo.rf.gd/cardiovascular_system_book.pdfIn PDF document text
    • http://xobofob.rf.gd/nonipalopuvawobigularowu.pdfIn PDF document text
    • https://s3.amazonaws.com/nupotukig/ion_grid_worksheet.pdfIn PDF document text
    • http://pexitiwe.epizy.com/10529968281.pdfIn PDF document text
    • https://s3.amazonaws.com/gomakobez/77054261483.pdfIn PDF document text
    • https://s3.amazonaws.com/fulosobezur/47503801023.pdfIn PDF document text
    • http://bubopewufifinov.epizy.com/live_tv_app_apkpure.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_off0000dad3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAD3 5212 bytes
SHA-256: 53fe0100d6bd64278d5ed857b5f147b46e8a3f4329d46ccd4af4bd93848af0a7
font_01_sfnt_off0000ec98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC98 10780 bytes
SHA-256: b4191d04f0141c7d9ca580002aaadb51d06f493015f0f54ffcf357da789b775d
font_02_sfnt_off00011138.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11138 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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