Malicious PDF — malware analysis report

Static analysis result for SHA-256 e6f2f8cfeb49d3e7…

MALICIOUS

PDF

76.9 KB Created: 2021-09-19 02:11:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 56c193a1d2be104321cf62776c8045bf SHA-1: 0ec9c3bb4c695ec23b82ea471b7a8a3c40ed129b SHA-256: e6f2f8cfeb49d3e7edf1d353613e3f9ed6e84e6fb5e77ac3fec6634c49a3d754
182 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript and multiple links to external resources, many of which are algorithmically generated and hosted on disposable domains. The ClamAV detection and ML classifier strongly indicate malicious intent, likely to trick users into downloading a secondary payload via the provided links. The presence of a 'download button' heuristic further supports this phishing or malware delivery vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://factorysales.com/userfiles/files/5886367764.pdf In PDF document text
    • https://appvid.eus/userfiles/files/pojufimuvipumum.pdfIn PDF document text
    • https://evrenmentese.com/upload/ckfinder/files/pajofinazula.pdfIn PDF document text
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/16144f52461545---25599136301.pdfIn PDF document text
    • https://szaniterplaza.hu/ckfinder/userfiles/files/12568623450.pdfIn PDF document text
    • https://bunyaminerdemir.com/resimler/files/73281109633.pdfIn PDF document text
    • http://rentbucharest.net/images/userfiles/22185096180.pdfIn PDF document text
    • http://alrehabourhome.com/userfiles/files/mozojaguravabuliveb.pdfIn PDF document text
    • https://2ruoteexpo.it/ckfinder/userfiles/files/61625162273.pdfIn PDF document text
    • http://packagingandfoodmachinary.com/userfiles/file/dobekedojovagol.pdfIn PDF document text
    • https://clinicscrm.com/img/files/96742586981.pdfIn PDF document text
    • http://studioagronomoserragiotto.eu/userfiles/files/nagaju.pdfIn PDF document text
    • http://hoangnamjsc.com/upload/files/sesujifegivipadomisedobaz.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/86e7f9dfe3fe77ad7d79593af38937cc/51211897715.pdfIn PDF document text
    • http://forma8.kz/ckfinder/userfiles/files/47916357100.pdfIn PDF document text
    • https://portecitadelle.portecitadelle.ca/ckfinder/userfiles/files/63556779994.pdfIn PDF document text
    • https://ambulatorioveterinariosismondi.eu/file/buzotobufu.pdfIn PDF document text
    • https://iskoruma.com/upload/ckfinder/files/82273323362.pdfIn PDF document text
    • http://rovitek.com/userfiles/file/1285471660.pdfIn PDF document text
    • http://koyomisushi.com/uploads/files/41653364884.pdfIn PDF document text
    • https://hizlipin.com/calisma2/files/uploads/romutalot.pdfIn PDF document text
    • http://donkaew-furniture.com/ckfinder/userfiles/files/98405084654.pdfIn PDF document text
    • http://matras-devison.com/upload/file/fifesedevimuviwuzedipido.pdfIn PDF document text
    • http://eschool365.in/js/admin/uploadfiles/file/38873105475.pdfIn PDF document text
    • http://budgettranslation.hu/sites/default/files/file/17497448516.pdfIn PDF document text
    • http://fueandhair.com/userfiles/files/17998096639.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=if+i+reset+my+android+phone+what+will+happenPDF 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_off0000c9a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9A1 10912 bytes
SHA-256: 86932f43aae6f04eb285da9563e1c3e163949b973b7ad6bd8d18ae00f5b09546
font_01_sfnt_off0000e2c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2C3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fad5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAD5 16464 bytes
SHA-256: 7c27f393c99c76ad25b2cb5c0ae42c633ceadf62d69716308f66328d67b505e8

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