Malicious PDF — malware analysis report

Static analysis result for SHA-256 47d15ebb97459b7c…

MALICIOUS

PDF

86.9 KB Created: 2021-09-18 20:09:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 2d2bc3b28aa609e8bb40a57a9c293f05 SHA-1: d6855714b206bb29b7405d809a52b142fef6e9cb SHA-256: 47d15ebb97459b7cfa81c269c36c32051b76cef13f4d17cafe1eb9a739de0c68
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to a link farm hosted on disposable domains, a common tactic for phishing or distributing further malware. ClamAV and ML classifiers strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and URL patterns suggest it's designed to redirect users to malicious content, likely leveraging embedded JavaScript for obfuscation or redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://alcoquimicos.com/ckfinder/userfiles/files/guzakulimepujikimubase.pdf In PDF document text
    • https://khachsan295doson.vn/namthuan/images/news/files/nexevidosimuxu.pdfIn PDF document text
    • https://perfecthospital.org/ckfinder/userfiles/files/6239590554.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/1614167f1ebc75---kaluwakufepidekut.pdfIn PDF document text
    • http://jakpaisanestate.com/images/upload/files/pituvobativibaf.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/f0683b15lq2rds2p0hd6bsrl92/kobatomusazelubadopesotof.pdfIn PDF document text
    • https://foodsafebox.com/ckfinder/userfiles/files/jokirefazilofamug.pdfIn PDF document text
    • http://studioboscono.it/userfiles/files/tezezaxafebavudobikif.pdfIn PDF document text
    • http://marcth.pl/media/fck/file/2558631333.pdfIn PDF document text
    • https://mahae.hu/files/files/mepaxinabetejabojilu.pdfIn PDF document text
    • http://aallergy.netlovestories.com/upload/files/mixelidowafi.pdfIn PDF document text
    • http://thessalonikiflights.com/files/files/92999045454.pdfIn PDF document text
    • https://chungcungoaigiao.vnpec.xyz/uploads/files/56235641087.pdfIn PDF document text
    • http://full814.com/upload/files/wimipiwomagefeliwim.pdfIn PDF document text
    • https://pvesc.vn/uploaded/file/97818011847.pdfIn PDF document text
    • http://zhodnoceni-penez.cz/is/images/FCKeditor/File/foxiduxo.pdfIn PDF document text
    • http://zensushialiso.com/uploads/files/18137299239.pdfIn PDF document text
    • https://aimhc.com/userfiles/file/35288181197.pdfIn PDF document text
    • http://emannsltd.com/userfiles/83430013594.pdfIn PDF document text
    • http://opgzvh.hr/upload/file/78287124546.pdfIn PDF document text
    • http://iviltra.lt/images/files/razidezaverilolevonezu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=bubble+bobble+android+gamePDF 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_off0000f212.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF212 10616 bytes
SHA-256: 2ef0d1b2aa11aaf7ab301d3f7ae1783b165a478cf017018317225890dd3a8c5d
font_01_sfnt_off00010a00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A00 17056 bytes
SHA-256: de6f856d53e67c6e9c2cbbaccb9e7927d7eab432b0c2df8b91c5b8ea937ee2bc
font_02_sfnt_off00013670.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13670 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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