Malicious PDF — malware analysis report

Static analysis result for SHA-256 a442d436ff0469dd…

MALICIOUS

PDF

60.9 KB Created: 2021-10-01 09:01:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 1ee4c9029c88e299c23560bd2bdbe41b SHA-1: 18f7c07c227e59fdfbc6daff35a3b5e23871e444 SHA-256: a442d436ff0469dd486c909e7ad3df97c92dae6df7f8ca5eac42892e97f39b30
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to numerous external PDF files hosted on various domains. While no scripts were explicitly extracted, the presence of embedded URLs and the link farm nature strongly suggest an intent to redirect users to malicious content, likely for phishing or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8084

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://fabriziochessa.it/userfiles/file/71619542958.pdf In PDF document text
    • http://fujieshubao.com/zk/UploadFile/file/2021091323542873499.pdfIn PDF document text
    • http://thankschicken.com/uploads/files/bujakopikedaxerepudarem.pdfIn PDF document text
    • https://rgcsmt.org/ckfinder/userfiles/files/53030544661.pdfIn PDF document text
    • http://sksound.com/userfiles/file/23216258506.pdfIn PDF document text
    • http://nationalcoopadvisors.com/userfiles/files/modupuvagi.pdfIn PDF document text
    • http://cheniou.handysociality.com/upload/files/fuveregemif.pdfIn PDF document text
    • http://eperon-kochersberg.com/img_db/8403057272.pdfIn PDF document text
    • http://fine-cottage.ru/userfiles/files/jumisazumunodufatosupep.pdfIn PDF document text
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/7dcfc739eb7f850c39e854d927ffeff2/85134127914.pdfIn PDF document text
    • http://criollo-cocoa.com/userfiles/file/41208552498.pdfIn PDF document text
    • http://tomekorea.com/userData/board/file/pusuguxafi.pdfIn PDF document text
    • http://jjkxmy.com/upload/files/202109162156424752.pdfIn PDF document text
    • https://triangle-electronics.com/assets/userfiles/file/kaxasevitar.pdfIn PDF document text
    • https://www.ojchamber.com/ckfinder/userfiles/files/dujanobiwu.pdfIn PDF document text
    • http://cicm2015.mist.ac.bd/app/webroot/ckfinder/userfiles/files/regewotidagamojavabisow.pdfIn PDF document text
    • https://economiadecomunion.net/ckfinder/userfiles/files/xebamowapa.pdfIn PDF document text
    • https://lifetides.ca/cambridge/uploads/files/48898662022.pdfIn PDF document text
    • http://volkshilfe-ktn.at/images/content/files/lalifu.pdfIn PDF document text
    • http://shahnawazonline.com/uploads/files/tozisafozujigiwopijup.pdfIn PDF document text
    • https://haisanquangninh.org/data/dulieu/files/jaguloje.pdfIn PDF document text
    • https://www.abaco-engineering.it/wp-content/plugins/formcraft/file-upload/server/content/files/16154213ddbe6d---gomexemewawoxami.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=free+instagram+followers+and+likes+appPDF link annotation
    • 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_off0000b0a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0A9 17304 bytes
SHA-256: 09ba0b0155222b605c55a971ddc95c8d982a07d27c7568943deb759858eaac84
font_01_sfnt_off0000dcf8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCF8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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