Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f707ec459ecf8bb…

MALICIOUS

PDF

84.2 KB Created: 2021-09-23 08:43:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 530d777ffc750d29d545deb3cc0f769c SHA-1: d38099f3a9bb0ff4d5bc0fc8d637c1e256012bc8 SHA-256: 1f707ec459ecf8bb386f904d57109e7a0e4a68f6140b38b359db6a3e549ed11f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to disposable hosting, indicating a link farm designed to redirect users. ClamAV and ML classifiers identified this PDF as malicious, specifically as a phishing or trojan variant. The presence of external URIs and the link farm heuristic strongly suggest an attempt to redirect users to malicious sites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://krisoc.ru/uplcv?utm_term=world+famous+battleground+game PDF link annotation
    • https://karatenarrewarren.com.au/ckfinder/userfiles/files/nuselozama.pdfIn PDF document text
    • http://isisthailand.org/file_media/file_image/file/94720643555.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614601f00fe44---lapex.pdfIn PDF document text
    • http://christopherspubandgrille.com/userfiles/files/bejugewikofipafawasi.pdfIn PDF document text
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/e5c658aa71b7ef076b0eec7423f78870/kutiziwuwovabozopew.pdfIn PDF document text
    • https://gibidesign.com/fckfiles/file/tefiv.pdfIn PDF document text
    • http://goldenteriyaki.com/uploads/files/kazuvapukadaxuj.pdfIn PDF document text
    • https://dondepodemosir.com/userfiles/file/32867063192.pdfIn PDF document text
    • https://pvcmikser.com/upload/files/50505509873.pdfIn PDF document text
    • https://jbdclothiers.net/emailer/userfiles/file/30588790828.pdfIn PDF document text
    • https://giolog.biz/images/bulk_images/files/vubavuwirodiwer.pdfIn PDF document text
    • http://sjar-tech.com/uploadfile/file///2021092000484584.pdfIn PDF document text
    • http://clubselectionvoyages.net/images/file/wotufezakadeguxevegapofaj.pdfIn PDF document text
    • http://wadsoda.com/UserFiles/File/33659388066.pdfIn PDF document text
    • http://immobilier-valence-agen.com/userfiles/file/marukobukubagebe.pdfIn PDF document text
    • http://chemonova.com/FCKeditor/file/domuroxumoveganuvifolevus.pdfIn PDF document text
    • https://ladangmimpi2.com/contents/files/86233754745.pdfIn PDF document text
    • https://topclassgreenery.nl/images/file/xejixodepiguwiruru.pdfIn PDF document text
    • http://divorcefinance.nl/uploads/file/dorufikixegata.pdfIn PDF document text
    • https://ans5680.preneed91.com/upload/files/75991016211.pdfIn PDF document text
    • http://ideviceplus.nl/app/webroot/files/userfiles/files/zonafovozez.pdfIn PDF document text
    • http://burragebrothers.org/demo/jolie/beta/userfiles/files/nezipupe.pdfIn PDF document text
    • http://dh-life.com/ckfinder/userfiles/files/35924058337.pdfIn PDF document text
    • http://kimkhimientrung.com/uploads/image/files/74276031013.pdfIn PDF document text
    • http://7seapharmtech.com/Uploadfiles/files/79734154657.pdfIn PDF document text
    • https://eksiliotomotiv.com/upload/ckfinder/files/futadodige.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_off0000e406.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE406 17592 bytes
SHA-256: c2c3fb53d69f5467dc79b61e4f6813fae00817513a2557e6cd4e9947fa71cf99
font_01_sfnt_off000111b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111B6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000129cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129CD 10836 bytes
SHA-256: 50935b057a6f913e8231a5bf9fc790db1f58c31bfc0d9ae21277318041a6f26f