Malicious PDF — malware analysis report

Static analysis result for SHA-256 af5eccd0be6abbde…

MALICIOUS

PDF

63.2 KB Created: 2021-09-24 02:12:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: e4f6fa0e96d7a5d69707e095e76d0821 SHA-1: 8d3991ab8b0c68b7bd166b34b3ac3264e1a0ac8b SHA-256: af5eccd0be6abbdee6b6d3c80b1394710f3ee9bff0decd0b3a3730e85f1fc8cb
124 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains a large number of embedded URLs, many pointing to disposable domains, consistent with a link farm designed to distribute malicious content or phish users. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic specifically identifies this pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9183

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 https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/24f221f8dc87f3235879e4c51d2f9528/18969052940.pdf In PDF document text
    • http://tongrentangthai.com/UserFiles/file/90888931060.pdfIn PDF document text
    • http://ccsl.asia/files/bujirevureriluzibile.pdfIn PDF document text
    • http://designbeginnings.com/upload/file/74004987644.pdfIn PDF document text
    • http://www.hgbehringer.de/img/files/files/desajiketiwifixab.pdfIn PDF document text
    • https://livstyle.ro/home/livstyle/public_html/uploads/files/fipemumarofabo.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/xozudikeme.pdfIn PDF document text
    • https://dudikom.pl/userfiles/file/parafaw.pdfIn PDF document text
    • https://www.beadvised.co.uk/wp-content/plugins/super-forms/uploads/php/files/3900df6c2bf651b0bfebafc3fad37b02/wujafuxerod.pdfIn PDF document text
    • https://ycb.one/pro_pic/files/74079207401.pdfIn PDF document text
    • http://dienmaythanglong.org/uploads/files/janalokimonadetowirus.pdfIn PDF document text
    • http://aptwash.com/userData/ebizro_board/file/vegugululuwipepabofu.pdfIn PDF document text
    • http://studiofantino.it/userfiles/files/32557688253.pdfIn PDF document text
    • http://ordineveterinarireggioemilia.it/userfiles/files/zotuziwipitobu.pdfIn PDF document text
    • http://gelikonline.ru/content/Files/47688123209.pdfIn PDF document text
    • http://mfo-fond.ru/ckeditor/ckfinder/userfiles/Images/files/55823205832.pdfIn PDF document text
    • http://decoworld.in/dayafter/uploadimages/newsimages/file/nulusulitovopiv.pdfIn PDF document text
    • http://www.donboscovizag.org/images/files/lagawanujunezikofumo.pdfIn PDF document text
    • http://debsecond.net/UserFiles/File/dupitukugexapedidodavef.pdfIn PDF document text
    • http://sensi-leszno.pl/userfiles/file/kelovutudurakamuwiredo.pdfIn PDF document text
    • https://pannonfinanz.eu/editor_up/75153106079.pdfIn PDF document text
    • http://avon-bratislava.sk/files/files/14016795059.pdfIn PDF document text
    • http://chuanghuilaw.com/filespath/files/20210924052733.pdfIn PDF document text
    • http://www.americaninvest.net/upls/files/64822700075.pdfIn PDF document text
    • http://probeg2000.ru/files/userfiles/files/tawigedijewig.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=cricket+league+gclPDF 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_off0000c51a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC51A 18196 bytes
SHA-256: 60fcb629bc8a281ccc2db2a1126fb8f0c7104aed222a0fdc939a9918954ee90c