Malicious PDF — malware analysis report

Static analysis result for SHA-256 d83172e593f1a0a6…

MALICIOUS

PDF

81.1 KB Created: 2021-10-14 17:27:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 7d5869b63d7c5e507269eb13b9de6dfb SHA-1: da63712b11e48b07965761193be0aa03c25d3c53 SHA-256: d83172e593f1a0a620c400caeecdf516d975cb3e0feff52ededb9db6b2b06418
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to potentially malicious or unknown domains, suggesting a phishing or redirection scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for credential harvesting or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a phishing attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://pratham.one/file/jarasimikajekedalozo.pdf In PDF document text
    • http://bwc.lt/i/jopitozazorewubopiwofaxos.pdfIn PDF document text
    • https://hoatuoi360.vn/uploads/files/kiromiwibeniwebu.pdfIn PDF document text
    • http://hightopeducation.com/cms_uploaded/file/pekitenep.pdfIn PDF document text
    • http://blankheich.de/images/uploads/file/5683588496.pdfIn PDF document text
    • http://www.superior-inkjet.com/login/ckfinder/userfiles/files/91396653247.pdfIn PDF document text
    • https://doucetplasticsurgery.com/ckfinder/userfiles/files/gowavokezonusom.pdfIn PDF document text
    • http://www.casasemio.com.br/ckfinder/userfiles/files/petunokunata.pdfIn PDF document text
    • https://transdeliveris.lt/userfiles/file/14936632814.pdfIn PDF document text
    • http://sdes.in/uploads/munuzu.pdfIn PDF document text
    • http://sovaimm.it/userfiles/files/detugabovomewufasafimumo.pdfIn PDF document text
    • http://castudio.eu/userfiles/files/91512575038.pdfIn PDF document text
    • http://pkpneu.cz/userfiles/file/tinasamamikiwovav.pdfIn PDF document text
    • http://snbedu.com/uploadfile/file///2021100405110043.pdfIn PDF document text
    • https://morganmethod.tuesdaytrader.com/ci/userfiles/files/tobugisovigusotinib.pdfIn PDF document text
    • https://floraplant.gr/FCKeditor/userimages/file/sipenagivopisoso.pdfIn PDF document text
    • http://pomelieagency.com/userfiles/files/dulezoxipefudi.pdfIn PDF document text
    • https://nusantarabet4d2.com/contents/files/meloluwefamajumulot.pdfIn PDF document text
    • http://pospatrans.cz/UserFiles/File/radivokelowor.pdfIn PDF document text
    • http://olympicburger1988.com/uploads/files/34606625687.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Gsjc/~3/EqozwcbAC44/uplcv?utm_term=is+there+a+new+handmaid%27s+talePDF 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_off0000d912.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD912 10464 bytes
SHA-256: efadfed3c0a613a1d594ec247e4f9e01e7d99f8d10ad07e97f2842e5c2c3908f
font_01_sfnt_off0000f0b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0B7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000108c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108C9 17900 bytes
SHA-256: fd771b9bf0948321ab7c5844a393f0cd48a44183ed2fafe6c59a471bb716ab6b

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