Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f5531ae5f9396df…

MALICIOUS

PDF

70.7 KB Created: 2021-09-18 06:11:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: d055f1b7dc87d25c333555f388823a5d SHA-1: 37f82f1dba379b5aa66a26ba86f09b4876fd4862 SHA-256: 6f5531ae5f9396df887dc8a5599bf983918b90aa717f3b2cd77353f2169fdebf
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample is a PDF document containing embedded JavaScript, which is a common technique for exploiting vulnerabilities or redirecting users. The heuristic firings indicate the presence of external URIs and a link farm, suggesting a phishing or malware distribution attempt. The embedded JavaScript likely executes to redirect the user to one of the listed URLs, potentially to download a second-stage payload or phish for credentials.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.2573

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.
  • 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
  • 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://huntic.ru/uplcv?utm_term=immortal+legend+idle+rpg PDF link annotation
    • http://tysons-cafe.com/uploads/files/demubamokufawozoga.pdfIn PDF document text
    • https://vinatech.com/userfiles/file/48702391439.pdfIn PDF document text
    • http://bindashnews.com/userfiles/file/lekefofidob.pdfIn PDF document text
    • http://cartopack.com/Images/file/98396942747.pdfIn PDF document text
    • https://arslanemlak.com/E/file/In PDF document text
    • http://musthighschool.mn/ckfinder/userfiles/files/63010375023.pdfIn PDF document text
    • http://www.leads-bd.org/app/webroot/js/ckfinder/userfiles/files/81184092273.pdfIn PDF document text
    • http://hglobaltour.com/FileData/ckfinder/files/20210912_CECDDB820CEA6E95.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141cb5ad0040---66858266527.pdfIn PDF document text
    • http://parilka.by/var/upload/file/1600859715.pdfIn PDF document text
    • http://orenprom.com/img/account/file/48731662221.pdfIn PDF document text
    • http://nuestratierrapremios.com/campannas/file/ririgenuzedodajuvux.pdfIn PDF document text
    • http://geyikkimya.com/userfiles/upload/file/30472326425.pdfIn PDF document text
    • https://koratspring.com/upload/file/fijefonisigil.pdfIn PDF document text
    • http://dominant.name/userfiles/file/pemejebuzozabajodo.pdfIn PDF document text
    • https://latgalesamatnieki.lv/files/file/62320472444.pdfIn PDF document text
    • http://baltic-rt.ru/ckfinder/userfiles/files/jojugovagoxe.pdfIn PDF document text
    • http://mishor-uvk.com/uploads/files/zuvidupujadikugagotiveji.pdfIn PDF document text
    • http://angelescare.com/userfiles/file/90333276136.pdfIn PDF document text
    • http://ketnoikienthuc.com/upload/files/zifalidevifepusixevef.pdfIn PDF document text
    • https://butagallery.com/userfiles/files/nepipovazezesikigorofugot.pdfIn PDF document text
    • http://tunecharts.com/userfiles/file/45969552917.pdfIn PDF document text
    • http://lingeriedediva.com/UploadFile/file/2021090512465673499.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d59b995e61---26726420105.pdfIn PDF document text
    • http://donateagift.eu/userfiles/file/29854831480.pdfIn PDF document text
    • http://drcleancenter.com/uploads/files/202109051100362496.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000db63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB63 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f37a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF37A 10516 bytes
SHA-256: 88c1e6638d9e4c289c9683d076339bf56b118c3f9fe6234be0cee3b90dc3a541

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