Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d823e947a1b8c1c…

MALICIOUS

PDF

73.8 KB Created: 2021-09-18 22:06:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: c424208204d3102f792f8fcfbc448a1c SHA-1: 6a7576689a3674589bc73a7160443bcd4244c503 SHA-256: 3d823e947a1b8c1cba8657440ac957e24cae3f7cfaf354ca319e45926afe0cb3
126 Risk Score

Malware Insights

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

The sample was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, with one heuristic specifically flagging it as a link farm on disposable hosting. While no scripts were extracted, the presence of many external links suggests a phishing or scam attempt, likely directing users to malicious content or further stages of an attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 5

  • 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
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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://polymer-optix.de/userfiles/file/vukevomawemurudesoxis.pdf In PDF document text
    • https://maydangson.com/vietkiendo/upload/file/78333326784.pdfIn PDF document text
    • https://btegypt.com/file/tetorexivubeziborewe.pdfIn PDF document text
    • http://fatamorgana.fr/uploads/assets/file/jixigevajebiwexasalopo.pdfIn PDF document text
    • http://laskod.hu/userfiles/file/80935050619.pdfIn PDF document text
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/ca1bg25n85a0dmsfr6v6l1imsi/86229107605.pdfIn PDF document text
    • http://ewhamd.net/upFiles/ckeditor/files/51436135978.pdfIn PDF document text
    • http://archiw.bibliotekalesmierz.eu/img/upload/files/degemomixubad.pdfIn PDF document text
    • https://www.puskinas.lt/ckfinder/userfiles/files/59175973335.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/72955420444.pdfIn PDF document text
    • http://dezmaster.com/userfiles/file/korubemilifuxovas.pdfIn PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613d72b29ea8e---rugakewiwa.pdfIn PDF document text
    • http://gustosandvic.com/ckfinder/userfiles/files/sedotixebaden.pdfIn PDF document text
    • http://winteringlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/sejorapexopu.pdfIn PDF document text
    • http://bagliodeimille.it/userfiles/files/53161116937.pdfIn PDF document text
    • https://cs-nippon-cp.com/mailmagazine/upload/files/mifuwapi.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/11561092239.pdfIn PDF document text
    • https://balajihighfields.in/userfiles/file/59108922132.pdfIn PDF document text
    • http://gainliving.com/upload/editor/file/fabapilesorilunuxogubab.pdfIn PDF document text
    • http://esipro.be/userfiles/file/60171150839.pdfIn PDF document text
    • http://rollfactorytogo.com/uploads/files/figenilidamojivasujaf.pdfIn PDF document text
    • https://sahodayabbsr.com/test/fckeditor/file/nelugesulopifozibo.pdfIn PDF document text
    • http://xn--80affcyoc0ac1f6a.xn--p1ai/admin/modules/ckeditor/ckfinder/userfiles/files/25345045077.pdfIn PDF document text
    • http://salsainkonstanz.de/media/files/fetivinabozufetiwe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=boruto+naruto+next+generations+seasonsPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bb83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB83 17576 bytes
SHA-256: a7cc4b2a4c3f0481dc1120ec5788a49a3bdb16d17b3aa85c67d9a4d5c024674a
font_01_sfnt_off0000e91f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE91F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010136.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10136 10492 bytes
SHA-256: 9de69afaf49d9995a366d00812cf82344a38ac7c875111b35123b8c6937f3990