Malicious PDF — malware analysis report

Static analysis result for SHA-256 721d3b4d2f5e6f3a…

MALICIOUS

PDF

54.5 KB Created: 2021-10-06 22:56:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 1b672d2258d01a38ac405c010d1f47d7 SHA-1: e37bc0a6fe1ca40f00145f100d34e52059672e25 SHA-256: 721d3b4d2f5e6f3af857ec7ab5ca61986c41ffe0f985fb1cb75606b2d370a540
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to suspicious domains and are flagged as part of a link farm. ClamAV detection as 'Pdf.Phishing.Trojan' and ML classification further indicate malicious intent. The document body is heavily obfuscated, but the presence of external URIs and the link farm heuristic suggest the primary goal is to redirect the user to malicious content, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5904

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 https://apotekatia.ba/fajlovi/logigokun.pdf In PDF document text
    • http://incomingmakedonia.com/files/files/konanosuxelemakatoz.pdfIn PDF document text
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/704ph2ooccfsopb6e5mg42vr3l/70571272556.pdfIn PDF document text
    • http://xn--oy2b9bv81anouola.com/upload/file/202109251616237916.pdfIn PDF document text
    • http://taiwangallant.com/uploads/files/202109250944435940.pdfIn PDF document text
    • http://architetturaurbanistica.it/userfiles/files/54033564039.pdfIn PDF document text
    • https://ofcourselc.com/admin/uploadsfile/dexitowekudaz.pdfIn PDF document text
    • https://tybistanbul.org/resimler/files/49520670051.pdfIn PDF document text
    • http://deforma.it/userfiles/files/82338981500.pdfIn PDF document text
    • http://alumcity.ru/userfiles/file/jelibogikuxadejoseg.pdfIn PDF document text
    • http://antropolog.ru/userfiles/file/47873525308.pdfIn PDF document text
    • http://mrukseo.pl/userfiles/file/laxebejimizanefole.pdfIn PDF document text
    • http://patanamachine.com/imgUpload/files/64473663267.pdfIn PDF document text
    • http://yasaitogo.com/uploads/files/dapuwe.pdfIn PDF document text
    • http://webcertain.net/contentupload/fckeditorUploads/organization_/file/71697133749.pdfIn PDF document text
    • http://gmicropilotes.com/uploads/files/vusibitokofifuseweno.pdfIn PDF document text
    • https://mgs-on-track.com/app/webroot/userfiles/file/65418320766.pdfIn PDF document text
    • https://promaxsuspension.com/csmimage/file/lamipixuvumevijopotijon.pdfIn PDF document text
    • http://hk-sai.com/ckfinder/userfiles/files/96050980595.pdfIn PDF document text
    • http://balone.net/_upload/file///gapanefagezufezadu.pdfIn PDF document text
    • http://pnmanagementsolutions.in/uploads/5396940875.pdfIn PDF document text
    • http://harnettcountyhba.com/userfiles/file/mezegedisivinil.pdfIn PDF document text
    • http://mazraeir.com/images/upload/files/15643263729.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=importance+of+verbal+communication+between+teachers+and+learnersPDF link annotation