Malicious PDF — malware analysis report

Static analysis result for SHA-256 19f3aad8739a8be8…

MALICIOUS

PDF

83.7 KB Created: 2021-09-20 05:59:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 757df7a3b915d5796fb47044b375aa4d SHA-1: 591e2fb628055281d786a5e69b369686002105b5 SHA-256: 19f3aad8739a8be89f9fe48dfd533863e04c56367ab44b728f2fa4f5c40870a8
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as a malicious PDF by ClamAV and an ML classifier. It contains numerous embedded URLs, with one heuristic specifically identifying it as a link farm on disposable hosting. The PDF_URI heuristic points to a URL that appears to be a lure for a 'harry potter character compendium PDF', suggesting a social engineering pretext. The presence of multiple unknown URLs indicates a potential for redirection to phishing sites or malware downloaders.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 https://revive.fashion/upload/files/jukukeguxe.pdf In PDF document text
    • http://www.taxivanclass.com/uploads/ckfinder/files/nezuluwovar.pdfIn PDF document text
    • http://hajnysport.cz/FCK_userfiles/file/17888506382.pdfIn PDF document text
    • http://lncxjzxxw.com/upload_fck/file/2021-9-9/20210909175504270218.pdfIn PDF document text
    • http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613a2505c9fda---53825654042.pdfIn PDF document text
    • http://ahlhy.com/uploads/file/070516341191.pdfIn PDF document text
    • http://actlogistic.vn/upload/editor/files/wipik.pdfIn PDF document text
    • http://www.diplomat2014.ru/ckfinder/userfiles/files/tifawetowitoponusarigi.pdfIn PDF document text
    • http://xn--12cbg9dihj7egda2g6a7dceb1d2cp4nvgf4f.com/datas/files/61704116218.pdfIn PDF document text
    • https://ketex.com/trcgp/ckfinder/userfiles/files/basalib.pdfIn PDF document text
    • https://drisraadentalcenter.com/userfiles/file/34273549908.pdfIn PDF document text
    • https://groupekineconcept.com/userfiles/file/pubiga.pdfIn PDF document text
    • http://hiro-seiko.com/upload/files/87751413729.pdfIn PDF document text
    • https://art-gallery.mn/uploads/files/83672862307.pdfIn PDF document text
    • http://gaestehaus-am-erlkoenig.de/img/editor/file/48844498469.pdfIn PDF document text
    • http://asja-doll.ru/userfiles/file/24836542791.pdfIn PDF document text
    • https://jackinthegymtpe.com/uploads/files/202109050445423747.pdfIn PDF document text
    • http://www.mamafoundation.cz/ckfinder/userfiles/files/xudixog.pdfIn PDF document text
    • http://kabaretyimpresariat.pl/Upload/file/7604962174.pdfIn PDF document text
    • https://leonardscopysystems.com/home/leonards/public_html/ckfinder/userfiles/files/lufekiro.pdfIn PDF document text
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613175ff33114---sofanabawixatowoner.pdfIn PDF document text
    • http://roberlo.cz/www/files/file/vorigu.pdfIn PDF document text
    • http://portableandcool.com/files/files/nalarizibebapovela.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=harry+potter+character+compendium+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_off0000e104.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE104 10876 bytes
SHA-256: ef01eaa8adf9966fd388d38e1fd6288f51402015bda35882c4a9096f8d755746
font_01_sfnt_off0000f9ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9EC 18188 bytes
SHA-256: 196fb7852df17ff808895407e1f28b5e25a12d6a65dcc205ead7477a5d75f004
font_02_sfnt_off00012912.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12912 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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