Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c94482313ea5bc2…

MALICIOUS

PDF

85.4 KB Created: 2021-09-09 14:36:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 5db3d5e7e8d24835c224a568c86f0792 SHA-1: 56b49b6a78a47bb2fb5d12b85ea86e48ec3356f9 SHA-256: 1c94482313ea5bc29008cdb7f18bc637712277ca84ab81a5a2be120e4fbe8a6b
126 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which point to suspicious domains and are structured to appear as downloadable files, suggesting a phishing or malware distribution lure. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this by identifying a pattern of link farming on disposable hosting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://baxsporthorses.nl/userfiles/file/23456621990.pdf In PDF document text
    • http://viorina-deko.com/images/file/69081393844.pdfIn PDF document text
    • http://my-hustle.net/FCKeditor/editor/filemanager/connectors/php/connector.php?Command=FileUpload&Type=File&CurrentFolder=%2Ffile/94259634818.pdfIn PDF document text
    • http://dienlanhhuubinh.com/upload/files/kugavetusudijodokosezuju.pdfIn PDF document text
    • http://ghinelliarchitettura.it/userfiles/files/45409348643.pdfIn PDF document text
    • http://toyotarent.tw/FileData/ckfinder/files/20210902_4299083DAD484297.pdfIn PDF document text
    • http://xibuhuanyu.com/filespath/files/20210903143153.pdfIn PDF document text
    • http://xn--80age2amlc.xn--80adxhks/pics/images/file/fofakab.pdfIn PDF document text
    • http://srcchaika.ru/files/uploads/files/68604245656.pdfIn PDF document text
    • http://dongsimkindergarten.com/upload/files/vutigifaxilila.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161398fc4e6651---budupozimuganotalupubera.pdfIn PDF document text
    • http://wirheiraten.de/images/file/2724934666.pdfIn PDF document text
    • https://shoppingplanet.cityplanet.ro/ckfinder/userfiles/files/4357707815.pdfIn PDF document text
    • http://matras-devison.com/upload/file/vogijofusakomarisoso.pdfIn PDF document text
    • http://fujieshubao.com/zk/UploadFile/file/2021090820250673499.pdfIn PDF document text
    • http://lokalsport.no/userfiles/file/73288247936.pdfIn PDF document text
    • https://olterus.info/contents/files/xixokimegovu.pdfIn PDF document text
    • https://www.lsv-wittlage.de/ckfinder/userfiles/files/kewesi.pdfIn PDF document text
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/2b69f6cfe605f0116f0082211857c0ea/noduxezaneporevifepexoja.pdfIn PDF document text
    • https://edu-mate.kr/_UploadFile/Images/file/lezusimeba.pdfIn PDF document text
    • http://starma.pl/files/file/dukifanudupebi.pdfIn PDF document text
    • http://healthywithhart.com/res/file/karudedi.pdfIn PDF document text
    • http://sun-dr.com/uploads/files/202109061750469904.pdfIn PDF document text
    • https://kermoulin.com/userfiles/file/18214583978.pdfIn PDF document text
    • https://franchisefarm.franchiseharbor.com/files/files/78382343736.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=how+to+change+app+that+opens+pdf+androidPDF 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_off0000eaaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAAA 17180 bytes
SHA-256: d96d62d8fe1a11a9e4112e01ea0aec375e06941fb23f401c546757ffed700253
font_01_sfnt_off000116fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116FA 10932 bytes
SHA-256: e14a65b99b3cf0e8d6cf0cede77f80730d791066f3d54f2d2be62d1ae06bcb7c
font_02_sfnt_off0001301a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1301A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1