Malicious PDF — malware analysis report

Static analysis result for SHA-256 efa114a41beab569…

MALICIOUS

PDF

63.7 KB Created: 2021-09-08 13:50:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a1b519ed6a504d88191f8d1f0e0714ff SHA-1: 258424402dadbda095883d70370a03eb682b7626 SHA-256: efa114a41beab569069f7adc731c55991bf5c6a28be6a9b6e0e14528f80369e8
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to disposable domains and are part of a link farm, suggesting a phishing or malware distribution attempt. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically flags this behavior, indicating a lure to download further content. The ClamAV detection as 'Pdf.Phishing.Trojan' strongly supports a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7025

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://siltherm.com/ckfinder/userfiles/files/tekiv.pdf
    • https://sealand-pptc.com/userfiles/file/45228676144.pdf
    • https://ratoempat.com/contents/files/sopileputid.pdf
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/161323c144e75b---99230960434.pdf
    • http://xahscw.com/userfiles/file/wexakurusatewazor.pdf
    • http://matsonconstruction.net/userfiles/file/66783992463.pdf
    • http://clainvest.pl/userfiles/file/8552274369.pdf
    • http://artetendasud.it/userfiles/files/16882886446.pdf
    • https://asfus.net/virgsurv/userfiles/file/27955122881.pdf
    • http://planbmedia.hu/files/pudofebelali.pdf
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613246f45b155---43165280142.pdf
    • http://amblesidewindermere.ca/fckuploads/images/file/64893445724.pdf
    • http://e-junghan.com/userData/board/file/89696787358.pdf
    • https://quizai.com/uploads/files/vilifabisu.pdf
    • https://bccphil.paramedix.biz/uploadfiles/file/towefonaxebasojusubaju.pdf
    • https://peterdegendt.be/file/vaxuxinowulobima.pdf
    • http://year-c.com/upload_fck/file/2021-9-3/20210903113237746164.pdf
    • http://kameleonhastanc.hu/files/file/jadulilixupowexig.pdf
    • http://assytekservizi.com/userfiles/files/lomobu.pdf
    • http://uhy-th.com/image/upload/files/fagenaxaluf.pdf
    • http://www.vandiestbrandstoffen.be/uploads/files/fufer.pdf
    • https://innovativallatgyogyszer.hu/fileok/file/xarugi.pdf
    • https://podereilmontaleo.it/writable/public/userfiles/file/36850238939.pdf
    • http://bayanairag.com/uploads/userfiles/files/gulejokaxumidurovuxopepi.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=reduce+pdf+size+setup+download
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d0aa.bin
3859dfa5ccb2ac5ea82cedf4694336fb6b9f6ad24a6a18607489cfeb57da7d73
pdf-font-stream PDF embedded font (sfnt) at offset 0xD0AA 17240 bytes