Malicious PDF — malware analysis report

Static analysis result for SHA-256 6cdf3bfdf3a229ba…

MALICIOUS

PDF

92.8 KB Created: 2021-09-11 12:49:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 86c74be28a22d467728fdbf3f04a2559 SHA-1: b1354d6e6b9726f8687dba30f0139022f1186ecf SHA-256: 6cdf3bfdf3a229ba23458597a5f250388dc4a9b807deb056a71fce0728adb77a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The ML classifier and ClamAV detection strongly indicate this PDF is malicious. It contains numerous embedded URLs, many pointing to potentially suspicious domains, and one heuristic specifically flags it as a link farm on disposable hosting. While no scripts were extracted, the presence of external URIs suggests the PDF is intended to redirect users to malicious sites, likely as part of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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 http://retailcop.ca/files/67543015606.pdf In PDF document text
    • https://hbphoto.ca/resimler/files/durapitojuzegilibisi.pdfIn PDF document text
    • http://kxqcgs.net/filespath/files/20210901123131.pdfIn PDF document text
    • https://preciseenergygroup.com/media/91178601840.pdfIn PDF document text
    • https://sealand-pptc.com/userfiles/file/nadulabokujagotolufukoz.pdfIn PDF document text
    • http://kozszemle.hu/uploads/files/49776894693.pdfIn PDF document text
    • http://knipia.com/userfiles/file/61232627374.pdfIn PDF document text
    • https://derya.afmiletisimajansi.info/resimler/files/fenipujebali.pdfIn PDF document text
    • http://intranet.uts.edu.co/portal/app/ckfinder/userfiles/files/nuvufe.pdfIn PDF document text
    • http://ylpcl.com/ckfinder/userfiles/files/pibuxisidakejoruwazizeg.pdfIn PDF document text
    • http://uitvaartverzorgingsindex.nl/images/uploads/88315892411.pdfIn PDF document text
    • http://dichvumucin.com/upload/ckupload/files/ziwusafiseg.pdfIn PDF document text
    • http://albertopizzetti.it/userfiles/files/1003084194.pdfIn PDF document text
    • https://299-45.com/CKEdit/upload/files/dajaser.pdfIn PDF document text
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/90e8be931cb066aec881b084405482f1/87254148055.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c4e5a8d4e6---tanawaluxag.pdfIn PDF document text
    • http://jobsandhi.com/uploaded_files/userfiles/files/tirevof.pdfIn PDF document text
    • http://uzks.hr/upload/datoteke/52301542155.pdfIn PDF document text
    • https://jin-hung.com/userfiles/file/vupipexoga.pdfIn PDF document text
    • https://shriramsteels.in/public/ckfinder/userfiles/files/guvumibexuxo.pdfIn PDF document text
    • https://znalac.com/userfiles/file/wosekideramefogafepu.pdfIn PDF document text
    • https://bwawarszawa.pl/upload/file/pibejodegujewebaxota.pdfIn PDF document text
    • https://benmoonpharma.com/userfiles/file/tagudibozedubasilanatuxup.pdfIn PDF document text
    • https://atlas-consulting.ro/fckeditor/fisiere/file/zevinokavevuvivumosebuvis.pdfIn PDF document text
    • https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/dfef6cf2691289e9903d16baa074c9ff/82969389683.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=where+we+can+download+movies+for+freePDF 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_off0001075e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1075E 17424 bytes
SHA-256: 30d624453150714287483c19d9317b5c7855001f10d8c05d85186e0ed898af6a
font_01_sfnt_off00013467.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13467 10788 bytes
SHA-256: d719dd8ccbeed215397284838ea071381ac236c913519b7658147a708266dbb6
font_02_sfnt_off00014d1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14D1A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1