Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d582dd5d9d35b3b…

MALICIOUS

PDF

85.9 KB Created: 2021-09-18 16:01:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 170db01fe344b69e03531f1e4dd274ae SHA-1: eaff0236fb0dba9c3177f34ce4b01bf619962522 SHA-256: 3d582dd5d9d35b3b28b872007f458243db5d3f4da61e9aa8cb0cced37e78fcc6
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file detected as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs pointing to potentially malicious PDF files, indicating it functions as a link farm or downloader. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic confirms this behavior, suggesting an attempt to distribute further malware or phishing content. No scripts were extracted, but the structure and URL findings strongly suggest a malicious intent to redirect users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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 https://e-room.co/userfiles/file/ziweju.pdf In PDF document text
    • http://elmbbq.com/uploads/files/botuwupaxeki.pdfIn PDF document text
    • http://asbufestival.com/uploads/FCK_files/file/90870163252.pdfIn PDF document text
    • http://probeg2000.ru/files/userfiles/files/54784231844.pdfIn PDF document text
    • http://promtour-rural.ro/userfiles/file/61562166896.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139e74627ca0---mutelefemevogoluvijoxapud.pdfIn PDF document text
    • http://www.hausbaumesse.at/ckfinder/userfiles/files/7343261062.pdfIn PDF document text
    • https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/fd8e3a7cea43e2cf13c5b974fb7f5d00/dikafanuvas.pdfIn PDF document text
    • http://fisioterapiasuzzara.it/userfiles/files/43112565460.pdfIn PDF document text
    • http://aalzkj.love-mrt.com/upload/files/83731123870.pdfIn PDF document text
    • http://studioarchperissinotto.eu/userfiles/files/36132568788.pdfIn PDF document text
    • http://dohertylaw.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/gawawut.pdfIn PDF document text
    • https://nk-sostanj.si/files/file/molutedekobafi.pdfIn PDF document text
    • https://twr1115.net/files/fckeditor/file/3592655162.pdfIn PDF document text
    • https://full-flavors.com/img/Data/file/surexugit.pdfIn PDF document text
    • http://studiogaleazzo.eu/userfiles/files/rekobosifovepi.pdfIn PDF document text
    • http://swaminarayangm.org/userfiles/file/serovazusiromarak.pdfIn PDF document text
    • https://mcdelandes.ca/uploads/file/fazarerifudit.pdfIn PDF document text
    • http://sonarkella.com/userfiles/file/sopedid.pdfIn PDF document text
    • http://fsnmmaterials.com/UPFILE/userfiles/files/sibogugexemuxepufufik.pdfIn PDF document text
    • https://girisimhaber.com/uploads/file/12760457824.pdfIn PDF document text
    • https://ctcitsupport.com/media/files/23570909952.pdfIn PDF document text
    • https://weyergans-hcc.lv/userfiles/file/85713883215.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=how+to+lock+and+unlock+iphonePDF link annotation
    • http://pro.ovh.net/~tribuene/images/banque/file/fiziz.pdfIn PDF document text
    • 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_off0000eaa0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAA0 10612 bytes
SHA-256: 79d50dfedbf273ac1d302d1bfc454cdb8574ea7539bb660f6973833380abe624
font_01_sfnt_off000102cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102CB 18120 bytes
SHA-256: 34e6ef5256f6838cc2968a4a3fe10a76d3d4bb78410058aec88c5aa5fef3252a
font_02_sfnt_off00013191.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13191 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1