Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f8d9e8e6d129dec…

MALICIOUS

PDF

69.0 KB Created: 2021-09-25 12:44:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 8b728bdbdf296109f15f9ef955014b58 SHA-1: 8b52293a4f7f3efe99372d290bb7e1e591df8dee SHA-256: 1f8d9e8e6d129dec9bc3c0abb75a37165235ae25f076cd415de825a1cadd2c46
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which are part of a link farm on disposable hosting, indicating a likely attempt to redirect users to malicious sites. The presence of external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly suggest a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://pixomot.ru/uplcv?utm_term=fortnite+best+superhero+skin PDF link annotation
    • https://natyabio.com/uploadfiles/80565859434.pdfIn PDF document text
    • http://asu78.ru/userfiles/file/58618308157.pdfIn PDF document text
    • https://panama4d.com/contents/files/74286923664.pdfIn PDF document text
    • http://vantaidongsaigon.com/uploads/files/20816040070.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/gujazapopodav.pdfIn PDF document text
    • https://processwork.archerhuang.com/ConImg/files/92288853725.pdfIn PDF document text
    • http://presupuestos.pavysan-bigmat.es/ckfinder/userfiles/files/44212036687.pdfIn PDF document text
    • https://inprovitperu.com/ckfinder/userfiles/files/likasijeb.pdfIn PDF document text
    • http://thebrownbag.vn/upload/files/fubumamakovikotutotojix.pdfIn PDF document text
    • http://yanarfabrics.com/firma/files/52848695857.pdfIn PDF document text
    • https://millersexpress.com/userfiles/file/84159584469.pdfIn PDF document text
    • https://igk-lilienthal.de/downloads/94989432680.pdfIn PDF document text
    • http://brandorbit.in/userfiles/file/77954414395.pdfIn PDF document text
    • http://marcth.pl/media/fck/file/romozizadebugagekubi.pdfIn PDF document text
    • https://lockerova.eu/admin/upload/documents/maravapokibedokalorepo.pdfIn PDF document text
    • http://ymmicro.com/files/files/raxivapemulij.pdfIn PDF document text
    • http://fuku-zou.com/userfiles/file/xenezusodozujedubu.pdfIn PDF document text
    • https://8foro.exceltur.org/exceltur_nuevo/ckfinder/userfiles/files/jiwuvomedapixexegenunog.pdfIn PDF document text
    • http://taxfreepoint.com/file/fesimufipozelemugar.pdfIn PDF document text
    • http://cn-daomeng.com/upload/userfiles/files/9cdfa3e813232d621c51e3443df39b8f.pdfIn PDF document text
    • https://viveironativodevicosa.com.br/ckfinder/userfiles/files/58148060274.pdfIn PDF document text
    • https://pharma-tools.pl/galeria/file/delevagipiteduzimuvato.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ae58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE58 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c66a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC66A 16212 bytes
SHA-256: bf3efd01b54ee53d121f348d04452ab1d5aafb8186943233e9756c64befe9982
font_02_sfnt_off0000ef48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF48 10448 bytes
SHA-256: dded2dcd9856b0dd93ff659e51cb30a8bfafa03be3e2a090ef281904ee927210

Open this report in the interactive analyzer, or submit your own file for analysis.