Malicious PDF — malware analysis report

Static analysis result for SHA-256 ee3dd899b3f69382…

MALICIOUS

PDF

71.2 KB Created: 2021-09-25 06:16:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: b32633879a593eaf7452fc7bafc90249 SHA-1: ca457a86acf770e4208a148aab8404c81207802b SHA-256: ee3dd899b3f6938262396d13a01c5417de80f47c032af64b18b273cefcf57f28
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The ML classifier and ClamAV detection strongly indicate maliciousness. The PDF contains numerous external links, with one heuristic specifically identifying it as a link farm on disposable hosting, suggesting a phishing or redirection attempt. While no scripts were explicitly extracted, the presence of PDF-specific JavaScript execution capabilities (T1059.007) is common in such malicious documents, often used to facilitate the download of further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://biolabsrl.org/userfiles/files/27442702529.pdf In PDF document text
    • https://adminico.nl/userfiles/file/63728427186.pdfIn PDF document text
    • http://noticiascgnews.com.br/ckfinder/userfiles/files/60373644777.pdfIn PDF document text
    • https://giolog.biz/images/bulk_images/files/49377280261.pdfIn PDF document text
    • http://ageddfjtjgrade.pretty-match.com/upload/files/44235179520.pdfIn PDF document text
    • https://promobryansk.ru/userfiles/files/58690576975.pdfIn PDF document text
    • http://paykaaluminiya.ru/ckfinder/userfiles/files/72314324467.pdfIn PDF document text
    • http://sl-light.ru/design/img/upload/file/11455487262.pdfIn PDF document text
    • https://mldom.xyz/web/img/podborky/files/sibusunoj.pdfIn PDF document text
    • http://healhumanity.foundation/userfiles/file/vitokej.pdfIn PDF document text
    • https://garnet-medical.com/userfiles/files/66490171009.pdfIn PDF document text
    • http://duoctruongxuan.vn/userfiles/image/file/lupopuluse.pdfIn PDF document text
    • https://verticala.ro/images/userfiles/kivofogopoj.pdfIn PDF document text
    • http://5m-tti.com/uploads/image/files/31189269363.pdfIn PDF document text
    • http://keramann.ru/uploads/files/fotim.pdfIn PDF document text
    • http://gearcon-eng.com/file_media/file_image/file/66191883161.pdfIn PDF document text
    • https://adminico.nl/userfiles/file/pidubakol.pdfIn PDF document text
    • https://alexandrapanayotou.com/web/images/static/file/19295502951.pdfIn PDF document text
    • http://xn----7sbev0bhje.xn--p1ai/images/news/file/rozetarovirenigawun.pdfIn PDF document text
    • http://yuanjen.com/ckfinder/userfiles/files/dumasisefufumoduliniwan.pdfIn PDF document text
    • https://www.edm-medical.net/ckfinder/userfiles/files/31653634110.pdfIn PDF document text
    • http://pallenberg-busreisen.de/uploads/files/pizivavik.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=o+que+%C3%A9+um+telemovel+androidPDF link annotation
    • http://perfecturology.cafe24.com/upload/editor/imagefile/29397437329.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_off0000af9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF9F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c7b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7B6 10732 bytes
SHA-256: 5ffd984c9591aab246b622a9ce353dd6f497a29a3b32196fe001e4de61d5fe0a
font_02_sfnt_off0000dfcc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFCC 17980 bytes
SHA-256: 97fb8b9e9ac0436cea42fc0edbb38edede6f23c5449bbe1a349e4d673bfdc410

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