Malicious PDF — malware analysis report

Static analysis result for SHA-256 519179743966fe21…

MALICIOUS

PDF

77.0 KB Created: 2021-09-19 20:28:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: a876d9296b11407f38a8e385d3624131 SHA-1: 3389c167972c4b484f66d23f6cabb56ae900c885 SHA-256: 519179743966fe211950291bb19a3f7987937567e9c673657d0d852ff5e8c894
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to disposable domains, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these links. Although no scripts were explicitly extracted, the PDF structure and heuristic firings point towards a malicious document, potentially leveraging embedded JavaScript for malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

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://pistant.ru/uplcv?utm_term=jessica+hynes+doctor+who PDF link annotation
    • http://zgic.ru/!upload/files/93807829332.pdfIn PDF document text
    • http://noithatphathuy.com/Images_upload/files/junobarubazufenix.pdfIn PDF document text
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136a7c3f2460---83572320028.pdfIn PDF document text
    • http://pivotal-technologies.com/userfiles/file/takelewakedurimuzogili.pdfIn PDF document text
    • http://abwcrainhwy.com/uploads/files/tulubatizu.pdfIn PDF document text
    • https://sgicorp.com/userfiles/files/fetatidekakemosa.pdfIn PDF document text
    • https://linardi.ru/files/file/6679004295.pdfIn PDF document text
    • http://xn--b1akwe.xn--p1ai/userfiles/file/47228805412.pdfIn PDF document text
    • http://homesunshinepharma.com/upload/files/98806758552.pdfIn PDF document text
    • http://minhledtran.com/luutru/files/9472477999.pdfIn PDF document text
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/80a1a6854c9a0ff864a9b959c7f3758b/90342652600.pdfIn PDF document text
    • http://fillaracingacademy.cz/ckfinder/userfiles/files/xitanux.pdfIn PDF document text
    • http://americansemitruckparts.com/d/files/82137022797.pdfIn PDF document text
    • https://ww150003.linebot.net/upfile/files/20210903011335.pdfIn PDF document text
    • http://thailaundry.com/imgUpload/files/tarepezazizebef.pdfIn PDF document text
    • https://zagi.hr/files/vuserovopufovevenivitavi.pdfIn PDF document text
    • https://onsale.social-push.cc/data/fckeditor/files/46540769454.pdfIn PDF document text
    • https://fivetc.net/uploads/files/35627796123.pdfIn PDF document text
    • http://0225674989.kad.tw/kads/ckfinder/userfiles/files/zumowevawewovapare.pdfIn PDF document text
    • http://harringtonassociateslaw.com/Test/JabzMedicalBillingService/userfiles/file/kuvuxarosekidoje.pdfIn PDF document text
    • http://opusincertum.it/userfiles/files/89267145884.pdfIn PDF document text
    • https://decoveinvestment.com/userfiles/file/95607826393.pdfIn PDF document text
    • http://metrominicabs.com/survey/userfiles/files/xelolanuziseboka.pdfIn PDF document text
    • http://hacsbathtarntaran.org/~/userfiles/file/gonuwifosi.pdfIn PDF document text
    • http://stuarteisbrucklaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/87803487010.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_off0000c75d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC75D 17864 bytes
SHA-256: ef8e64c32b6b875cd9483dc44a63ca0a0b15e3578767293c18d9d7be44e7fb8d
font_01_sfnt_off0000f646.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF646 10612 bytes
SHA-256: cfff60319e906ee5e8ef39b04fd283c79a2b7588634ce152a9f998ad5e2eb66b
font_02_sfnt_off00010e9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E9F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1