Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1f75da321a0f42e…

MALICIOUS

PDF

85.5 KB Created: 2021-09-12 20:46:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 8708540f41a5096ea0f2527f8b961692 SHA-1: d501aeb5c943a27e889f61a43d974c9eb3160540 SHA-256: f1f75da321a0f42e8a12a2a0e7c2535d3470ef5210f3b7ca112fa53db3a8adc5
174 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for delivering malicious content. Heuristics indicate a payment redirection lure, suggesting a phishing attempt to obtain financial details. The numerous external URLs, many on disposable hosting, further support this phishing and link-farming pattern. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Payment redirection / bank-detail change lure high SE_PAYMENT_REDIRECT_LURE
    Document describes new or changed bank, wire, ACH, IBAN, SWIFT, or routing instructions — a high-value business-email-compromise pattern
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://inwebjor.ru/uplcv?utm_term=how+to+get+into+a+private+account+without+following PDF link annotation
    • http://sreema.org/FCKeditor/file/91589736690.pdfIn PDF document text
    • http://crestviewshopping.abwingsmd.com/uploads/files/jikavexe.pdfIn PDF document text
    • http://www.recko.ru/ckfinder/userfiles/files/78638434219.pdfIn PDF document text
    • https://textosl.com/upload/editor/file/85233886311.pdfIn PDF document text
    • http://phamtrangia.site/upload/files/41635895161.pdfIn PDF document text
    • http://epmresearch.org/userfiles/files/vozedipufol.pdfIn PDF document text
    • http://bidmitt.com/img/files/file/42540583568.pdfIn PDF document text
    • http://wimborst-ceramics.nl/ckeditor/ckfinder/userfiles/files/45606843062.pdfIn PDF document text
    • http://art-lan.ru/uploads/assets/file/pesilukowasupa.pdfIn PDF document text
    • http://shinies.ru/img/lib/file/5844288776.pdfIn PDF document text
    • https://takarasushimn.com/userfiles/files/gosinetidusa.pdfIn PDF document text
    • http://wwstationery.com/files/file/90516236310.pdfIn PDF document text
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/028bssnjbm2ahb97nbabgiup3l/30175933847.pdfIn PDF document text
    • https://a-guskov.ru/uploads/files/16915536659.pdfIn PDF document text
    • http://biznesfishki.ru/files/userfiles/files/36880397435.pdfIn PDF document text
    • http://tufaghanafc.com/js/ckfinder/userfiles/files/59572751679.pdfIn PDF document text
    • http://gdgom.com/upload/file/210903022101477585dda6pyyjurgb.pdfIn PDF document text
    • http://encino.kopanramen.com/uploads/files/lowodofe.pdfIn PDF document text
    • http://360global.ca/userfiles/file/69385902406.pdfIn PDF document text
    • https://eagleegg5k.com/ckfinder/triplebuserfiles/file/samibedepidabo.pdfIn PDF document text
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/16130080eb8b4f---zelasipur.pdfIn PDF document text
    • http://novafish.it/userfiles/files/zivokoton.pdfIn PDF document text
    • https://forssh.com/userfiles/file/jujorojesag.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_off0000e845.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE845 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010057.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10057 18032 bytes
SHA-256: b96baab4572884744b39b068cb2fba3f72e06c01bc89c21a254b375ea5f2bd1f
font_02_sfnt_off00012f17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F17 10832 bytes
SHA-256: ec4764770dc4947218119b8329ddaece59238c6984a06cde520ede61c1c6add6