Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8dad8a25b854921…

MALICIOUS

PDF

92.7 KB Created: 2021-09-15 21:29:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: aef5db7ab7b373957427227392dbc21a SHA-1: 23f7fef42a64aa76e137a6bb8e71c13f242aab06 SHA-256: e8dad8a25b854921d5b8ad43aaf6632c45e065129b637e96e4c65c157c1fd337
126 Risk Score

Malware Insights

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

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many of which point to potentially disposable hosting, suggesting a link farm or phishing lure. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically flags this behavior. While no scripts were explicitly extracted, the nature of the embedded URLs and the overall detection suggest the PDF is intended to redirect users to malicious sites, likely as part of a phishing campaign or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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://keyday.ru/files/files/32543685993.pdf In PDF document text
    • https://oncallanatomist.org/ckfinder/userfiles/files/38430321979.pdfIn PDF document text
    • http://marinda.ru/pics/images/file/77012984907.pdfIn PDF document text
    • https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/a123019b7b5302030350c3ad91c78a80/57824149351.pdfIn PDF document text
    • https://clubelsendero.com/img_pag/file/67508363610.pdfIn PDF document text
    • https://vongtaytramhuong.vn/upload/files/26280864849.pdfIn PDF document text
    • https://baglab.pl/galeria/file/nejaro.pdfIn PDF document text
    • http://jadeite.ru/images/file/38923083618.pdfIn PDF document text
    • https://terlickodds.cz/www/www/fckphotos/file/85151448737.pdfIn PDF document text
    • https://ratoempat.com/contents/files/ziwerejorukemomexu.pdfIn PDF document text
    • https://jlgardner.org/home/jlg/public_html/ckfinder/userfiles/files/mixulaj.pdfIn PDF document text
    • http://demkapi.com/resimler/files/tatuvotonog.pdfIn PDF document text
    • http://bojovesporty.cz/userfiles/file/7813649702.pdfIn PDF document text
    • http://drivescuolaguida.it/userfiles/files/9547877160.pdfIn PDF document text
    • https://tahuacoop.com/cms_gpadmin2015/sgi_userfiles/userfiles/files/18425473184.pdfIn PDF document text
    • https://rlmahtani.com/userfiles/files/zurabitatomiki.pdfIn PDF document text
    • http://awfiowv.love-mrt.com/upload/files/38098662923.pdfIn PDF document text
    • http://jjsgreatescape.com/uploaded_files/userfiles/files/14463092291.pdfIn PDF document text
    • https://contabil-fiscal.ro/mm/file/kiligeremilulitow.pdfIn PDF document text
    • https://universitecentrale.net/uploads/FCK_files/file/70351851741.pdfIn PDF document text
    • https://bluza-shop.ru/content/File/gotajerazipukusul.pdfIn PDF document text
    • https://cnc-ar.ro/files/file/64174741728.pdfIn PDF document text
    • http://vimbark.sk/editor_uploads/files/fezukak.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=bible+healing+study+course+pdfPDF link annotation
    • 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_off000103de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103DE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011bf0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BF0 18380 bytes
SHA-256: da59e3bc09f7ae39cd27ce96456527f4309c49743f9394838aebff4353305b92
font_02_sfnt_off00014b40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B40 11304 bytes
SHA-256: 8832725560c38aec6f3e64d66c10ce2bfdb6ec96541ca37e19034ba1f849921d

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