Malicious PDF — malware analysis report

Static analysis result for SHA-256 ced692c91cd8296f…

MALICIOUS

PDF

84.3 KB Created: 2021-10-11 18:43:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: b5c0c3d5d1904a5f38290cbb7e2aee08 SHA-1: 52708db4d17592a1fca46fe336823b9e91c0895c SHA-256: ced692c91cd8296fcbe7e1dbc0ef1eb029750935906996739d380aa31f71b98c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as a malicious PDF by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many pointing to suspicious domains, and a heuristic identified it as a link farm on disposable hosting. While no scripts were explicitly extracted, the presence of external URIs and the overall structure suggest it's designed to redirect users to potentially harmful content, aligning with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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 http://firewaterdamagedfw.com/test/fckeditor/uploadfiles/file/wovorisaditerepeno.pdf In PDF document text
    • http://cs-golfclub.com/ckupload/files/84495931884.pdfIn PDF document text
    • http://mishelik.ru/userfiles/file/59963901262.pdfIn PDF document text
    • http://zulaikhatextile.com/userfiles/files/37620889980.pdfIn PDF document text
    • https://yuanfuconstruction.com/ckfinder/upload/files/rizitodobozonimakofutisol.pdfIn PDF document text
    • https://tasivn.com/upload/ck/files/bupedikujawu.pdfIn PDF document text
    • http://taemyung.com/data/upload/file/84861598330.pdfIn PDF document text
    • http://teleinwestor.pl/userfiles/file/40114336368.pdfIn PDF document text
    • https://sesconbs.org.br/ckfinder/userfiles/files/88688642555.pdfIn PDF document text
    • https://exhibitproplus.net/mentorfinancial/page_images/file/wixotinokilosid.pdfIn PDF document text
    • http://huthamcauquanggiap.com/upload/files/29635402543.pdfIn PDF document text
    • http://safetruck.gr/images/file/mapuwarowufufalo.pdfIn PDF document text
    • https://trakyasoftavukatwebsitesi.demowebsiteleri.com/upload/files/5551008259.pdfIn PDF document text
    • https://editions-tlp.fr/ckfinder/userfiles/files/fivaxox.pdfIn PDF document text
    • http://klientskazona.radeton.sk/ckfinder/userfiles/files/manalimefa.pdfIn PDF document text
    • http://webinaris.org/ckfinder/userfiles/publics/files/vobuj.pdfIn PDF document text
    • http://sandsflooring.co.uk/ckfinder/userfiles/files/96248242509.pdfIn PDF document text
    • http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/f72dba918ca337c8259ef54836802ea4/57964393320.pdfIn PDF document text
    • http://15881588.com/ckupload/files/87591001651.pdfIn PDF document text
    • http://limoride.net/gallery/file/rusox.pdfIn PDF document text
    • http://dalnoboy.org/data/filestorage/upload/files/62715360689.pdfIn PDF document text
    • https://www.medicalbi.com/ckfinder/userfiles/files/kutisar.pdfIn PDF document text
    • https://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/60d7e43e66deccca820d2f9315ff9be9/4285636663.pdfIn PDF document text
    • http://lumieretvie.com/userfiles/file/77906491051.pdfIn PDF document text
    • https://acp-luxusingatlanok.hu/ckfinder/userfiles/files/tuxesakevekegum.pdfIn PDF document text
    • http://dailymaydemtien.com/userfiles/files/xopavupetukademilemuteru.pdfIn PDF document text
    • http://feedproxy.google.com/~r/MbOu/~3/RC0zOYPQW8A/uplcv?utm_term=love+hate+quotes+in+englishPDF 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_off0000e1d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1D3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f9ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9EA 10556 bytes
SHA-256: 606dfc2a41ea70a7e53dd32cca8728f9a74c2af7b06156689e1f477b0c620448
font_02_sfnt_off000111a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111A8 19656 bytes
SHA-256: da310b9c1333c00783097203bc10fe7825ea09c8c4f1f17f50cbf1d0bae54437