Malicious PDF — malware analysis report

Static analysis result for SHA-256 7753cf01b8ffdaa4…

MALICIOUS

PDF

71.9 KB Created: 2021-09-16 17:18:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b48fdcc58fd8173ddd22a3ddb9fc036d SHA-1: dbf8544c7457af707a007dbcbf0940080cf53d40 SHA-256: 7753cf01b8ffdaa4aba9f609b35dba5c951612bf743a9c91d7f7819cdd2affef
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by multiple heuristics, including a critical ClamAV detection for Pdf.Phishing.Trojan and an ML classifier indicating maliciousness. The PDF contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm or phishing lure. The presence of embedded JavaScript, though not directly analyzed here, is a common technique for exploiting PDF vulnerabilities or redirecting users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://safetyhanoi.com/userfiles/file/pepebonepefiwudawenodune.pdf In PDF document text
    • https://hr-serdahel.hu/images/file/48316143012.pdfIn PDF document text
    • http://meskerjager.nl/media/files/tobovomatepekurawo.pdfIn PDF document text
    • http://evopizza.lt/ckfinder/userfiles/files/36308228570.pdfIn PDF document text
    • http://2ds-creations.fr/userfiles/file/40587604242.pdfIn PDF document text
    • https://oilbasaro.com/web/images/ckfinder/files/20210915145528.pdfIn PDF document text
    • https://cometsecurity.in/admin/userfiles/file/89004841648.pdfIn PDF document text
    • http://www.ondebiz.com/userfiles/file/26964224176.pdfIn PDF document text
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/1613f0f7c4b66a---74541339494.pdfIn PDF document text
    • http://mimarkamilozkartal.com/userfiles/files/wugujegu.pdfIn PDF document text
    • https://www.lindopoint.it/wp-content/plugins/super-forms/uploads/php/files/320dfa38d2a356b0c5a40e224555bf1a/zejalitevejizori.pdfIn PDF document text
    • http://tv-kitchen.ru/files/files/24816225093.pdfIn PDF document text
    • https://mitrasuksesku.com/userfiles/file/40055129161.pdfIn PDF document text
    • http://traslochimontalto.it/userfiles/files/38281230898.pdfIn PDF document text
    • http://vektor28.ru/userfiles/file/fawasasijepikob.pdfIn PDF document text
    • http://giadinhmedia.com/uploads/files/3758292513.pdfIn PDF document text
    • http://vietnam-intraco.com/webroot/img/files/wonivekujesuwopikiz.pdfIn PDF document text
    • https://miraclechuppahs.com/userfiles/file/tafilolenedidajep.pdfIn PDF document text
    • https://ismet.com.br/ckfinder/userfiles/files/lakoxefifedonowaniwo.pdfIn PDF document text
    • http://baovecongtruong.com/upload/files/kuraxekaxobizogobeju.pdfIn PDF document text
    • http://auburn-companies.com/userfiles/files/kusuwupevekamomukoteduta.pdfIn PDF document text
    • https://sunridgecorp.com/uploads/files/202109160920126273.pdfIn PDF document text
    • https://duragloss.pl/userfiles/file/botubosobin.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=icon+android+materialPDF 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_off0000b8dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB8DD 16460 bytes
SHA-256: 75538e63356b83595ba39b7db04babcb4286d3cb3f2e9081f0def81d9431f20c
font_01_sfnt_off0000e35e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE35E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fb75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB75 10316 bytes
SHA-256: 5e0e2fb622b38efb3509fe624cfb726bb9a27e45b013af9b003bf76df6351642