Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ea914733c6cc1ce…

MALICIOUS

PDF

79.8 KB Created: 2021-10-05 09:43:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 3c2f97d6fdf3acc881ece4025e66f7e9 SHA-1: 209c6fe50da64e0a5d0d26ad14bd111a4427a2ed SHA-256: 7ea914733c6cc1cef4929a9964d3a1d5bdfe9980edc08b4b1bc04c61cf4b28f2
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, with one specifically identified as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://allytemp.ru/uplcv?utm_term=how+to+reduce+pdf+size+for+free PDF link annotation
    • http://dostrojar.sk/UserFiles/file/20422524341.pdfIn PDF document text
    • http://kant21.com/userData/board/file/20873623835.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16145ce8e46e64---fusibagixutaj.pdfIn PDF document text
    • https://geniodelweb.com/file/49643778888.pdfIn PDF document text
    • https://pre-www.bridge-academy.com/uploaded/ckeditor/files/kininasabegijezosededo.pdfIn PDF document text
    • http://www.astmalek.cz/obrazky/file/59393909062.pdfIn PDF document text
    • https://www.pension-chevaux-haras-gabereau.fr/ckfinder/userfiles/files/vozofu.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/nenowavijoguguborukesipa.pdfIn PDF document text
    • http://eau-msu.ru/ckfinder/userfiles/files/88879871523.pdfIn PDF document text
    • https://observatoire-omic.org/documents/file/30672211848.pdfIn PDF document text
    • http://geometracosentino.com/userfiles/files/83452137794.pdfIn PDF document text
    • http://hbisan.com/userfiles/file/91880994285.pdfIn PDF document text
    • http://sushiosushi.com/uploads/files/19204005717.pdfIn PDF document text
    • https://altstudio.be/app/webroot/uploads/file/suzala.pdfIn PDF document text
    • http://www.jasolasia.com/image/upload/File/naraxegixumewisikitebeva.pdfIn PDF document text
    • http://paulgraphics.paulsfashion.in/files/gutor.pdfIn PDF document text
    • https://radiosmile.hu/upload/file/63531439908.pdfIn PDF document text
    • http://korean-school.hu/hangul/userfiles/file/51551373968.pdfIn PDF document text
    • https://4of100churchstreet.com/assets/media/files/zoranu.pdfIn PDF document text
    • http://healhumanity.foundation/userfiles/file/54042737792.pdfIn PDF document text
    • http://santeh.md/img/files/musefuzagamate.pdfIn PDF document text
    • http://xn--h1acbpobggs.xn--p1ai/data/files/17152410510.pdfIn PDF document text
    • http://hitecds.com/userfiles/file/84080397114.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_off0000d0d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0D5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e8e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8E7 18672 bytes
SHA-256: 1ba477b94c5f1b4a588b091eaf3caa1120bcf59bf057759dd910f2986b352da1
font_02_sfnt_off000119bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119BB 10540 bytes
SHA-256: 8653f437fc8b7886dc18f6e1692a1622b0b83a5808046b69bf6d259ac1103f57

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