Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5e052eacca400f1…

MALICIOUS

PDF

78.6 KB Created: 2021-09-19 18:55:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 29422ed18fb64f4f9532affb8af42399 SHA-1: 0367f453ef9501d7c816dc88cd3c993c0488e54b SHA-256: d5e052eacca400f13ddd8f850589b92430e02d8d5468868027ac964dc44f95dd
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URIs and is identified as a link farm on disposable hosting, suggesting it's designed to redirect users to potentially harmful sites. The presence of embedded URLs and the PDF structure itself point towards an attack pattern involving the exploitation of PDF vulnerabilities or social engineering to lead users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://medvor.ru/uplcv?utm_term=fnaf+1+free+roam+android PDF link annotation
    • http://classicalgardenfountains.com/uplds/file/89796718797.pdfIn PDF document text
    • http://sun-green.nl/ckfinder/userfiles/files/sogevumifovuniwufot.pdfIn PDF document text
    • https://drnanemilk.com/tctt/sites/aaa/file/gebis.pdfIn PDF document text
    • http://ardeche.proximeo.com/ckfinder/userfiles/files/51848779440.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1613cc6e76a662---zawadone.pdfIn PDF document text
    • https://xuantruongtech.com/images/ckeditor/files/zopinopute.pdfIn PDF document text
    • http://xn--b1amishc2fb.xn--p1ai/ckfinder/userfiles/files/42546729307.pdfIn PDF document text
    • http://regmac.net/userfiles/files/94574486129.pdfIn PDF document text
    • http://haphadoor.com/upload/files/forisevufuzedavag.pdfIn PDF document text
    • https://learnrkbin.jugalbandiresearch.com/ckfinder/userfiles/files/52537065542.pdfIn PDF document text
    • https://unitedfightalliance.com/ckfinder/userfiles/files/17702016910.pdfIn PDF document text
    • http://xn--m1age8bh.xn--p1ai/files/file/newuw.pdfIn PDF document text
    • https://atlas-consulting.ro/fckeditor/fisiere/file/zevinokavevuvivumosebuvis.pdfIn PDF document text
    • http://fred-robin.com/ckfinder/userfiles/files/78320923045.pdfIn PDF document text
    • http://recko.ru/ckfinder/userfiles/files/pajabeduxaxibotirononekes.pdfIn PDF document text
    • http://mawratanews.com/armedia/uploads/files/90213539996.pdfIn PDF document text
    • http://klm-co.ru/foto/ck/files/lirokevi.pdfIn PDF document text
    • https://www.douggoodkin.com/admin/ckfinder/userfiles/files/bomusuripowawumuxek.pdfIn PDF document text
    • http://qapoll.com/2015/vat/upload/files/vabasejufotezi.pdfIn PDF document text
    • https://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/cd1adc97cf3011413595c433f3135861/motefobijexevulofizan.pdfIn PDF document text
    • http://euroear.eu/ckfinder/userfiles/files/rebemuzugofav.pdfIn PDF document text
    • http://lonerangerfanclub.com/ckfinder/userfiles/files/1796419170.pdfIn PDF document text
    • https://phuquiland.com/upload/files/24374649827.pdfIn PDF document text
    • http://techcessgroups.com/userfiles/file/koxizuwabenokudiz.pdfIn PDF document text
    • http://getrade.net/uploadfiles/file/dubarisejawozevir.pdfIn PDF document text
    • https://cyklo-wellness-penzion-palice.cz/content/ramujo.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_off0000d1d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1D5 10232 bytes
SHA-256: 6e64342be68cc97e5f79256aa18bc443031ef65941d7164fde07194e783d087f
font_01_sfnt_off0000e8bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8BD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000100cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100CF 16880 bytes
SHA-256: 024b6b98e55518d589c9ac1653974f710c5a310143434db89c77369ec1a6b77b