Malicious PDF — malware analysis report

Static analysis result for SHA-256 6cdd9f983fd580bd…

MALICIOUS

PDF

83.4 KB Created: 2021-09-05 17:18:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 2777ae527aeb864b0045a6bcd8e6bd17 SHA-1: 2d0df5d627e5674ba6e49d59ab76f47d9332d970 SHA-256: 6cdd9f983fd580bdfd33b16f21237b92b2e761fca0846ab0c283931d1d2cc035
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, with a significant number pointing to disposable or unknown hosting, indicative of a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. While no scripts were explicitly extracted, the PDF structure and URL patterns align with common techniques for redirecting users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://contemporaryteas.in/admin/uploads/file/vagigukidatipadivozate.pdf In PDF document text
    • http://minerva-collection.net/files/files/23339223111.pdfIn PDF document text
    • http://tevukasveza.lt/ckfinder/userfiles/files/gisezujosewi.pdfIn PDF document text
    • http://okmarin.ru/userfiles/file/xariguxenubax.pdfIn PDF document text
    • http://jessie.vn/images/ckeditor/files/33600254924.pdfIn PDF document text
    • http://lagrupacio.cat/file/76446081446.pdfIn PDF document text
    • http://faradtvandor.hu/picture/userfiles/file/fimarijakesineguja.pdfIn PDF document text
    • https://radekslodkiewicz.pl/files/file/waselemo.pdfIn PDF document text
    • https://laps.pl/userfiles/file/83991081022.pdfIn PDF document text
    • http://homeopathyhongkong.cn/files/41807106271.pdfIn PDF document text
    • https://plasy.com/uploads/file/62587075713.pdfIn PDF document text
    • https://metnar.pl/web/uploads/files/85391549070.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e24d3409d1---92408226416.pdfIn PDF document text
    • http://prttour.ca/FileData/ckfinder/files/20210610_02EB5068F6115EBB.pdfIn PDF document text
    • http://hsi-international.com/ckfinder/userfiles/files/72161783732.pdfIn PDF document text
    • http://alacarte-design.de/userfiles/file/98025865880.pdfIn PDF document text
    • https://2acontractor.it/images/file/sidoki.pdfIn PDF document text
    • http://mistral-paints.cz/userfiles/files/35460836562.pdfIn PDF document text
    • http://jinistudy.com/_UploadFile/Images/file/muzofizexumaferoveduj.pdfIn PDF document text
    • https://pluviaterra.mx/wp-content/plugins/super-forms/uploads/php/files/a8dba2608cd0af14ec74619a9f81be7a/96419235328.pdfIn PDF document text
    • http://thesecurityguardunion.ca/userfiles/files/kupokokudulimizo.pdfIn PDF document text
    • http://degeninhotel.ru/admin/ckfinder/userfiles/files/ganalezalefapopedud.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=apprendre+l%27espagnol+assimil+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_off0000dcd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCD4 10756 bytes
SHA-256: 1c26d494b4bdf190e012d36cedcc79586787e9cf7fca345ac6d5eefbe34f3e53
font_01_sfnt_off0000f552.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF552 19356 bytes
SHA-256: df93e159c5f5fefa89cb2c9dd31ce1710d6ba30202cc4a781b5716c465d6c0df
font_02_sfnt_off00012606.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12606 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1