Malicious PDF — malware analysis report

Static analysis result for SHA-256 037001409a566ffe…

MALICIOUS

PDF

75.3 KB Created: 2021-09-18 07:04:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 949a2bf0e28b073b80060ba6b65250bd SHA-1: 2f6ab9e45970f845e5fbf91ed29860ed8eaaf813 SHA-256: 037001409a566ffe895601745f818feabe54eb48fa78c4dc2d38d1aaf11a8f68
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many of which are hosted on disposable domains and utilize UTM parameters, indicating a phishing or spam campaign. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards an attack pattern involving redirection to malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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=mp3+song+download+apk PDF link annotation
    • https://thefertilizerproductionline.com/d/files/tapaputowenufu.pdfIn PDF document text
    • http://jagdrevier.hu/upload/images/file/nezujevibig.pdfIn PDF document text
    • http://solar-makernavi.com/ckfinder/userfiles/files/4908806582.pdfIn PDF document text
    • http://self119.net/upload/userfiles/2021/09/files/210918093451.pdfIn PDF document text
    • https://dukupahit.com/contents/files/sewizujivedojesulagobas.pdfIn PDF document text
    • https://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/782bb37937d507cbeefb54b0d2e65936/posawinusonilutif.pdfIn PDF document text
    • http://mlsconsulting.net/cms/files/File/forefes.pdfIn PDF document text
    • http://getsolarny.com/userfiles/file/wibop.pdfIn PDF document text
    • https://cristalparkhotel.com.ve/ckfinder/userfiles/files/55155312825.pdfIn PDF document text
    • http://tyextractor.com/d/files/begonosevanusemeditafo.pdfIn PDF document text
    • http://siciny.eu/userfiles/file/25916165394.pdfIn PDF document text
    • http://ediljolli.com/userfiles/files/64787647892.pdfIn PDF document text
    • http://pwr-tech.ru/userfiles/file/28306668510.pdfIn PDF document text
    • https://jazykovytabor.topenglish.sk/app/webroot/gallery/files/70145485611.pdfIn PDF document text
    • http://pmrs.ps/userfiles/file/76907665197.pdfIn PDF document text
    • http://www.tahi.hu/ckfinder/userfiles/files/gininivekobaruzuda.pdfIn PDF document text
    • http://sunrui-ti.com/d/files/gadizosudoz.pdfIn PDF document text
    • http://karat-dobremiasto.pl/userfiles/file/15218016418.pdfIn PDF document text
    • https://alcoquimicos.com/ckfinder/userfiles/files/69784748942.pdfIn PDF document text
    • http://pomocnaukowa.net/Upload/file/visisidepukefuvoranuzemob.pdfIn PDF document text
    • http://760_709737661.mildmedia-dev.eu/uploads/userfiles/files/21746275835.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_off0000c1cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1CF 17836 bytes
SHA-256: 492e9d3b358b624b00d813c1864658501acbcf5335034523dc3ea5304c75ac72
font_01_sfnt_off0000efd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFD6 10488 bytes
SHA-256: 54007ab62543b23f0bcf0fb91839bdee3502e6aa9b11f010cafea875e999c007
font_02_sfnt_off000107ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107AE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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