Malicious PDF — malware analysis report

Static analysis result for SHA-256 0e98cc56108e4f35…

MALICIOUS

PDF

70.6 KB Created: 2021-09-25 14:11:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: db1077459f98113ba15bff29073dedde SHA-1: 0c4951ae289e9146f52366e4be565253c1a50120 SHA-256: 0e98cc56108e4f358870e21f3ebe7267a2eac596de66c43b9c90333c328e2bd0
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ML classifiers and ClamAV as malicious. It contains numerous external URLs, many of which appear to be part of a link farm designed to obscure the ultimate destination. The presence of 'utm_term' parameters suggests tracking or phishing-related activity. While no scripts were explicitly extracted, the PDF structure and heuristic firings indicate it's designed to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9837

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://archism.ru/uplcv?utm_term=downloading+text+messages+from+android PDF link annotation
    • http://ackerviewguesthouse.com/userfiles/file/22968581488.pdfIn PDF document text
    • https://bravo-hk.com/userfiles/file/49741159672.pdfIn PDF document text
    • https://fuze-pay.com/ckfinder/userfiles/files/buxadesotulevugawazomaxa.pdfIn PDF document text
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/0558068a2ba04cb109990d36c6c946a8/88510344961.pdfIn PDF document text
    • http://we-women.de/default/files/uploads/file/51978546158.pdfIn PDF document text
    • https://floresdeserrezuela.com/aym_image/files/wazawudofufi.pdfIn PDF document text
    • http://szjg.hu/images/file/pididatibowezubapo.pdfIn PDF document text
    • http://dbcasagayathottam.org/assets/uploads/cms_images/files/tijesejikugapuxaja.pdfIn PDF document text
    • http://naturpix.ch/cmsimages/file/wizudatofu.pdfIn PDF document text
    • http://mimpiindah168.com/contents/files/duwibe.pdfIn PDF document text
    • http://bunny888.com/ckfinder/userfiles/files/vuvakawubegidaliw.pdfIn PDF document text
    • http://angel-conference.org/upload_fck/file/2021-9-14/20210914011957769119.pdfIn PDF document text
    • http://corkpotters.com/images/53810026352.pdfIn PDF document text
    • http://kavernoklub.com/campannas/file/69632068154.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136839013172---kowogupidikorodi.pdfIn PDF document text
    • http://poketomecam.com/uploads/files/66612324302.pdfIn PDF document text
    • https://eijo.in/ckfinder/userfiles/files/tililuruxi.pdfIn PDF document text
    • https://arvikabc.com/images/uploadedimages/file/zerarowomupi.pdfIn PDF document text
    • https://paron-rebondir.com/uploads/files/muguzimipuxanolomod.pdfIn PDF document text
    • http://thomasgearon.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/mofozibeletamewexaja.pdfIn PDF document text
    • http://joyerialaplaza.com/ckfinder/userfiles/files/wuxolodezajupisor.pdfIn PDF document text
    • http://quatanggiabao.com/images/uploads/files/73190869082.pdfIn PDF document text
    • http://hunicorn.hu/userfiles/file/11662634584.pdfIn PDF document text
    • https://avistravel.ro/userfiles/file/74004685766.pdfIn PDF document text
    • http://tourhong.com/FileData/ckfinder/files/20210906_9B0C938B1BF33455.pdfIn PDF document text
    • https://euroquimicadistribucion.com/zabaleta/data/imagenes_contenidos/file/43666464258.pdfIn PDF document text
    • https://webdatedepot.com/userfiles/file/safipazogumikapudanoxoped.pdfIn PDF document text
    • 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_off0000b308.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB308 10888 bytes
SHA-256: 0a7a59dea97c3a7a5a8a673b00728859ba08012a4d94c11dbd7b0f9ceaf79d82
font_01_sfnt_off0000cc0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC0F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e421.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE421 15940 bytes
SHA-256: eac2ee08c7a6b5a6283f9acde7e8c2516f9a607a7de3d63e89953616d154c5e6