Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b0454e56bafad9e…

MALICIOUS

PDF

72.2 KB Created: 2021-09-25 16:35:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: c55fbf32c5012e4b952a0840417ba71f SHA-1: e91e9ffe6a72c18e92219408ddf3c0d61da28d13 SHA-256: 8b0454e56bafad9e1cbef64919261127cc28a91974d8b51ef948534095f367ba
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm with numerous external URIs, many hosted on potentially disposable domains. Although no scripts were explicitly extracted, the PDF structure and the presence of many unknown URLs suggest it is designed to redirect users to malicious sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614d13f8a5a81---6510757454.pdf In PDF document text
    • http://kadet-ck.cz/pic/file/jinojiwixevuvolixa.pdfIn PDF document text
    • http://csc-0898.com/userfiles/file/20210906210921_p8ahgt.pdfIn PDF document text
    • http://hig-hegmann.de/userfiles/file/karud.pdfIn PDF document text
    • http://leebyunghun.kr/new/upload/board/files/30154983648.pdfIn PDF document text
    • http://gespk.com/userfiles/file/patuvawomuzepugo.pdfIn PDF document text
    • http://latiendasegura.com/contable_prueba/userfiles/file/nowowikagumatevelugojotav.pdfIn PDF document text
    • https://guclupin.com/calisma2/files/uploads/78077753804.pdfIn PDF document text
    • http://victoryelectricalsupply.com/ckfinder/userfiles/files/28663445906.pdfIn PDF document text
    • http://intertravel.hu/_user/file/57849880115.pdfIn PDF document text
    • http://chongqinghaohong.com/upload/files/54818600546.pdfIn PDF document text
    • http://wingmanresearch.com/userfiles/files/36226112723.pdfIn PDF document text
    • http://cariboohose.com/userfiles/file/98239171474.pdfIn PDF document text
    • http://dj-venci.com/uploads/pages/files/sifalenetiwek.pdfIn PDF document text
    • http://ggmtc.net/userfiles/files/34616611895.pdfIn PDF document text
    • http://kfoodntea.com/dataroom/file/56850801007.pdfIn PDF document text
    • http://madmojo.com/fckupload/file/7121992469.pdfIn PDF document text
    • http://chinamakina.com/userfiles/file/xarogakeziralopogef.pdfIn PDF document text
    • http://hftyby.com/upload_fck/file/2021-9-11/20210911154450108697.pdfIn PDF document text
    • https://ddtoyz.com/ckfinder/userfiles/files/butuwilek.pdfIn PDF document text
    • http://keralabiblesociety.com/fck_uploads/file/menomiwoba.pdfIn PDF document text
    • https://ecableapp.com/FCKeditor/FCKimgUpload/file/bofamogunizal.pdfIn PDF document text
    • https://motodubai.com/uploaded_images/files/tefefuguvaxorato.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=play+store+window+10PDF 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_off0000b5c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5C0 10616 bytes
SHA-256: bd45ef53beba5b8515c85dd9abcac1ed5554de55c486edd8d4c8fb6f9ec3dd29
font_01_sfnt_off0000ce45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE45 17416 bytes
SHA-256: 1c4e5425ef08bf034a386ba71969df76c965fbbc91f78871a4cf556809448384
font_02_sfnt_off0000fb71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB71 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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