Malicious PDF — malware analysis report

Static analysis result for SHA-256 993bfce6c4755379…

MALICIOUS

PDF

72.6 KB Created: 2021-10-10 03:31:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 925fe2e1fba3df85149cb00c6e8c2d09 SHA-1: 6e9a37fef158840e5181e62056f9ef18fc2f0904 SHA-256: 993bfce6c4755379c5379dcca836702f8b42955551cb3d2ad38e45d122fd7ecb
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the presence of numerous unknown URLs suggest the document is designed to redirect users to potentially harmful sites. While no scripts were directly extracted, the PDF structure and embedded URLs point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9827

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://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/f43bbe8bbac6042a3a950c69ac5e5186/49728923325.pdf In PDF document text
    • http://heldermusic.nl/ckfinder/userfiles/files/luwolokatalipe.pdfIn PDF document text
    • http://rockpapersun.com/upload_mce_image/file/56194822736.pdfIn PDF document text
    • http://mishelik.ru/userfiles/file/katowijajupeserakoma.pdfIn PDF document text
    • http://kechengchem.com/upload/files/12709685399.pdfIn PDF document text
    • https://chineseclothingonline.com/File/dogusewimotepanajabozula.pdfIn PDF document text
    • http://ucg-eg.com/userfiles/file/58615710291.pdfIn PDF document text
    • http://dgkno.cn/upload/82567155163.pdfIn PDF document text
    • http://lt101shop.com/userfiles/files/66741682039.pdfIn PDF document text
    • http://w-f-l.de/user_img/file/34822227535.pdfIn PDF document text
    • https://gamepinleri.com/calisma2/files/uploads/70488557672.pdfIn PDF document text
    • http://c2ctrading.org/cms_upload/files/xivujiwiwewifula.pdfIn PDF document text
    • https://harmony-lazienka.pl/Upload/file/webolamir.pdfIn PDF document text
    • https://matricula.arendic.cl/files/modefojapazi.pdfIn PDF document text
    • http://premiercontractinginc.com/files/file/sigubobuletinalawikutemiw.pdfIn PDF document text
    • http://proclima-membranes.ru/userfiles/file/6834414139.pdfIn PDF document text
    • http://schokofontaenen.de/idata/detetodanibikokejobavam.pdfIn PDF document text
    • https://joepromenshealth.com/wp-content/plugins/super-forms/uploads/php/files/0186d4239f16a038bc249e92512b2525/52403668604.pdfIn PDF document text
    • https://studybrilliant.online/app/webroot/img/userfiles/file/60847602512.pdfIn PDF document text
    • http://www.petercar0937494634.com/upload/img/files/30200197071.pdfIn PDF document text
    • http://fskyok.com/uploadfile/files/37338507171.pdfIn PDF document text
    • http://agenturamotivace.cz/uploadfiles/file/vapasexerenenabobar.pdfIn PDF document text
    • http://channelletterguide.com/ckfinder/userfiles/files/sosisezu.pdfIn PDF document text
    • http://dynamicyunnan.com/ckfinder/userfiles/files/vofexugusuneg.pdfIn PDF document text
    • https://jaukiaplinka.lt/ckfinder/userfiles/files/89032948612.pdfIn PDF document text
    • http://melvin.cz/data/niximotubifujubirorozomop.pdfIn PDF document text
    • https://mai-avto.ru/upload_files/file/96793077437.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=tapped+out+old+items+hackPDF 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_off0000b9c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB9C2 16464 bytes
SHA-256: d5dc12aaa89fca7c04226f5a97afc89dcbdb9f0e3a01e2a882e694bea52912c9
font_01_sfnt_off0000e41d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE41D 10728 bytes
SHA-256: 1139657af5002ea2049621b1aa22eaf7f239bf4354f9713a16ded27d790ce6c2
font_02_sfnt_off0000fcc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCC6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1