Malicious PDF — malware analysis report

Static analysis result for SHA-256 e1687681ba4ef17b…

MALICIOUS

PDF

66.1 KB Created: 2021-09-12 18:53:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 9f89ea7b5a31d9daa6e79aa9898d99ee SHA-1: e708dc1255a693ac6000294cd2d8f0545d8b24ce SHA-256: e1687681ba4ef17b76125d7c2b5e13f72d4edb648aa4ebb8f049baddcd6f8b16
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs, with a high concentration of links on disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier further support its malicious nature, likely for phishing or malware distribution. No scripts were extracted from this sample, but the PDF structure itself is indicative of a malicious lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5479

Heuristics 4

  • 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
  • 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://3gr-group.com/ci/userfiles/files/rorovomexatewapirakot.pdf In PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136171d06f66---mojuwapowezujinot.pdfIn PDF document text
    • http://vako.vn/app/webroot/uploads/files/nepopapuwogax.pdfIn PDF document text
    • http://energosol.pl/images_cms/file/tepolexinizobe.pdfIn PDF document text
    • http://nowyhotelik.pl/userfiles/file/30369091994.pdfIn PDF document text
    • https://villamishkan.com/310renonew/front/images/files/65406205352.pdfIn PDF document text
    • https://retrofitoman.com/ckfinder/userfiles/files/xuvubo.pdfIn PDF document text
    • http://wsystem.sk/userfiles/files/50747144.pdfIn PDF document text
    • http://aprt1day.ru/file/vakujapemutoxizetopajoro.pdfIn PDF document text
    • http://www.thunderesp.com/ckfinder/ckfinder.htmlfiles/bikodepavon.pdfIn PDF document text
    • http://salonorganica.ru/upload/files/72344760863.pdfIn PDF document text
    • http://surveycook.com/upload/tmp/202109/file/96366307754.pdfIn PDF document text
    • https://anakmeong.com/contents/files/gidokisazikeje.pdfIn PDF document text
    • http://madurastones.com/userfiles/file/zizonepisexisuni.pdfIn PDF document text
    • https://kristaldicarlo.com/userfiles/file/kepijiga.pdfIn PDF document text
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1613c1a4733bc5---72315776034.pdfIn PDF document text
    • http://njbeihang.com/uploadfile/file///2021090223052320.pdfIn PDF document text
    • http://tverzhilservis.ru/foktver.ru/ckfinder/userfiles/files/zilipawatam.pdfIn PDF document text
    • https://nobelboya.com/userfiles/file/68992727068.pdfIn PDF document text
    • http://t-p-fortune.com/userfiles/file/75960339132.pdfIn PDF document text
    • https://milliondollardesiclub.com/upload_files/featured/files/wovikifow.pdfIn PDF document text
    • http://mobil-tech.com/files/tebiluwaxelanuvapezasaf.pdfIn PDF document text
    • https://skywaytravelandholidays.com/ckfinder/userfiles/files/25114504461.pdfIn PDF document text
    • http://go-pxl.com/uploads/files/tunolezuwavogemor.pdfIn PDF document text
    • http://caudafotografia.com/userfiles/files/54178295710.pdfIn PDF document text
    • http://tvkinter.com/file_media/file_image/file/debotodexozogovaruvelizir.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=watch+a+quiet+place+2+gomoviesPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e391.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE391 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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