Malicious PDF — malware analysis report

Static analysis result for SHA-256 3826d4a324468ff3…

MALICIOUS

PDF

97.2 KB Created: 2021-09-09 01:53:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: fec88d55a284e2377a559f2757f8924d SHA-1: 9126a1a1b9f44be4440b3551994b94a8d5f69ba0 SHA-256: 3826d4a324468ff372a9708f17eb6193a6b2013658f6c99da393cbe0d8cfe30f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, with the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicating a high likelihood of malicious intent. ClamAV detection as 'Pdf.Phishing.Trojan' further supports this assessment. While no scripts were explicitly extracted, the structure and URL distribution suggest the document is designed to redirect users to potentially malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 5

  • 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
  • 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://mannaz.pl/userfiles1/file/besumegitelugidep.pdf In PDF document text
    • https://warsztatgdynia.pl/app/webroot/media/files/11894727768.pdfIn PDF document text
    • http://mrs-edu.com/sribati/editor/uploadfiles/92744180004.pdfIn PDF document text
    • http://yjeverspeed.com/userfiles/file/parabirupisamujakagipala.pdfIn PDF document text
    • https://livewireeventz.com/userfiles/file/wigodi.pdfIn PDF document text
    • https://www.kiemtoandongnghi.com/public/plugins/ckfinder/userfiles/files/84105875990.pdfIn PDF document text
    • https://samajsutra.com/userfiles/files/14303460232.pdfIn PDF document text
    • https://matrixx.lu/images/42658748914.pdfIn PDF document text
    • http://businesslegalgroup.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/vuzofinebalivekivanarodep.pdfIn PDF document text
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/161373b7cd443d---39409582050.pdfIn PDF document text
    • https://msiutilities.net/documents/45822608686.pdfIn PDF document text
    • http://le383.com/uploads/files/44412565780.pdfIn PDF document text
    • http://starroadchina.com/userfiles/file/sanimanivow.pdfIn PDF document text
    • https://mtestbd.com/assets/uploads/files/45733032441.pdfIn PDF document text
    • http://aorganboys.handyfriendship.com/upload/files/gijidupopuwebotiloganip.pdfIn PDF document text
    • http://creativecoms.net/userfiles/file/87449829136.pdfIn PDF document text
    • https://ducthai.vn/userfiles/file/58288814546.pdfIn PDF document text
    • http://daeryuhealthcare.com/ckupload/files/60300751766.pdfIn PDF document text
    • http://veszpremlizards.hu/_user/file/74089672005.pdfIn PDF document text
    • https://aiwcecckolkata.org/FCKeditor/file/fagigovulizenewi.pdfIn PDF document text
    • https://cafemocion.com/userfiles/file/buvedexujunatofivizigixuf.pdfIn PDF document text
    • https://shoppingplanet.cityplanet.ro/ckfinder/userfiles/files/70475278330.pdfIn PDF document text
    • http://obraz-tlt.ru/userfiles/file/sizekerenajotolekadureziv.pdfIn PDF document text
    • http://mexxeopaint.com/upload/files/51496077002.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=fastboot+source+codePDF 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_off00011658.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11658 10336 bytes
SHA-256: 14816d5713c349a2a076d4cd6d31694a8ddcb07749b9172556a21623d70c67ec
font_01_sfnt_off00012dd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DD7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000145e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x145E9 18876 bytes
SHA-256: e9885a9a95de95ff260bd6894bc059ce7fa8ee0ce23de23f203db1f804a41eca

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