Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c0dcf846d4b8f71…

MALICIOUS

PDF

81.9 KB Created: 2021-09-10 13:14:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: efd757ea5e224ff84bb412c8a987d4fd SHA-1: ef4b9ce58bbc34f17581bf5d811bf7f8d5a0bede SHA-256: 6c0dcf846d4b8f710b85995b68406527084df024763dd01b7f9ca7771f910609
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to suspicious domains, and is flagged by heuristics as a link farm and by ML as malicious. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports a malicious intent. While no scripts were explicitly extracted, the structure and URL distribution suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://xn--p3t29jo1ed4o4xw.tw/upload/files/retudetufopipokukebamok.pdf In PDF document text
    • http://jingluo.net/uploadfiles/files/8960996674.pdfIn PDF document text
    • http://studioguatta.it/userfiles/files/20053323773.pdfIn PDF document text
    • https://linkevicius.com/upload/galery/file/zudusivadobebikes.pdfIn PDF document text
    • http://glttek.com/userfiles/file/zuritisedurupujitowumunab.pdfIn PDF document text
    • http://megamento.com/_UploadFile/Images/file/69927430403.pdfIn PDF document text
    • https://leuphuotcamap.com/uploads/image/files/57035613103.pdfIn PDF document text
    • http://kasargod.net/uploads/file/torapu.pdfIn PDF document text
    • http://186086.com/upload/files/94876232018.pdfIn PDF document text
    • http://lawyermo.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/9782217860.pdfIn PDF document text
    • https://postelezmasivu-ostrava.cz/ckfinder/userfiles/files/benasasajuzafegilipi.pdfIn PDF document text
    • https://2ruoteexpo.it/ckfinder/userfiles/files/pomeleg.pdfIn PDF document text
    • http://brenderup.ro/mm/file/71110621107.pdfIn PDF document text
    • https://pelicanfinancialnetwork.com/ckfinder/userfiles/files/8723874373.pdfIn PDF document text
    • http://olech-rzeszow.pl/userfiles/file/piruwuxezazozev.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134296aefcf1---21515121703.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f62b3c1b87---77068482312.pdfIn PDF document text
    • https://repetitorebi.ge/userfiles/files/ranivol.pdfIn PDF document text
    • http://vouchertiket.com/airplane/ckeditor/uploads/files/bejiluxapuxosufejaroxosip.pdfIn PDF document text
    • http://inbiosa.eu/static/cfiles/files/589213415.pdfIn PDF document text
    • http://centrons.com/uploaded/file/344535236613b1dc58029a.pdfIn PDF document text
    • http://photo-ostrov.com/ckfinder/userfiles/files/jovuzazadelutozorowuz.pdfIn PDF document text
    • http://massageindex.nl/images/uploads/lowov.pdfIn PDF document text
    • http://luxmeterthai.com/ckfinder/userfiles/files/39396171310.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=best+upcoming+android+games+2021PDF 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_off0000db6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB6A 11260 bytes
SHA-256: ac7c42c79ef6f853ae42260a83cb25c89d8e671fcec54504c64754ab2dd1c7dd
font_01_sfnt_off0000f5bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5BB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010dcd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DCD 17284 bytes
SHA-256: 9f545311217708fd7d359fe3b2e748857bb084d3f3fca776e9488d8d87a735f7