Malicious PDF — malware analysis report

Static analysis result for SHA-256 029327ba6a50de99…

MALICIOUS

PDF

68.8 KB Created: 2021-10-05 13:47:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 3c21bc2abd994d4e1e234b23e592b4f6 SHA-1: dd6f6cc21455a8773ff60fc47997afdaf2b5a281 SHA-256: 029327ba6a50de99e0d712fd9e60855d9e641c47090df09cc856f14902553dfb
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm on disposable hosting, with numerous embedded URLs pointing to various PDF files. The document body is heavily obfuscated, preventing analysis of its specific content, but the overall structure and URL distribution suggest a phishing or scam campaign aiming to redirect users to potentially harmful content.

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://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145b74870caa---rapabiduxofijepokase.pdf In PDF document text
    • https://cristalparkhotel.com/ckfinder/userfiles/files/95161047917.pdfIn PDF document text
    • http://dongduong.net/Images_upload/files/59988155834.pdfIn PDF document text
    • https://razredna-nastava.net/files/mizepoxedeneti.pdfIn PDF document text
    • http://cissi.it/userfiles/files/84125254191.pdfIn PDF document text
    • https://al-farh-iq.com/upload/userfiles/file/lawexebelatuzopow.pdfIn PDF document text
    • http://serdceprirody.ru/userfiles/file/zuxubomojazofufozolisufuj.pdfIn PDF document text
    • http://bukvoznaika.ru/ckfinder/userfiles/files/gojixewolifagufusavixe.pdfIn PDF document text
    • http://mmckno2010.zkosuchdol.info/files/936488127.pdfIn PDF document text
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/9ora9gmc2njkdui52kok3jmkkt/ganasawikafifizafujijazu.pdfIn PDF document text
    • http://barudan.hk/UploadFile/file/20210915200842153.pdfIn PDF document text
    • http://xn--3e0b556bhrbowi6undva.com/ckupload/files/25077692550.pdfIn PDF document text
    • http://canhtoanland.com/upload/files/43794582330.pdfIn PDF document text
    • https://vibingvibes.com/userfiles/files/26067670054.pdfIn PDF document text
    • http://anhuizpyy.com/upload_fck/file/2021-9-15/20210915221627944286.pdfIn PDF document text
    • https://rtvpuls.com/ckfinder/userfiles/files/zakolexip.pdfIn PDF document text
    • http://cheapstandard.com/uploads/files/71487748189.pdfIn PDF document text
    • http://ticaproduce.com/ckfinder/userfiles/files/vafiv.pdfIn PDF document text
    • http://easyliveconstruction.com/ci/userfiles/files/93250787505.pdfIn PDF document text
    • https://generalaudit.pl/eurostyl/photos/file/38339491132.pdfIn PDF document text
    • http://kirakuramen.com/uploads/files/58484756486.pdfIn PDF document text
    • http://www.domplit2006.ru/ckfinder/userfiles/files/zovukuluk.pdfIn PDF document text
    • http://csc0731.com/userfiles/file/20211003021523_69x0gj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=agriculture+text+book+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_off0000b116.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB116 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c928.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC928 14572 bytes
SHA-256: fc8abc29b720a292a17d444e2e8804d97860dd40368bd983f9c5bb6ab20b050a
font_02_sfnt_off0000ed40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED40 10776 bytes
SHA-256: 6c510ff410276c744f5c84fed5300a30a51f79e320bfdaa15ccfae5df98ef3d8