Malicious PDF — malware analysis report

Static analysis result for SHA-256 dbf378e15a7b82ca…

MALICIOUS

PDF

69.5 KB Created: 2021-09-25 13:15:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: eaa68d658d6c928007992d35cf51540a SHA-1: 468993b314accd2fa13ade062153ff36353cf696 SHA-256: dbf378e15a7b82ca31fdae420ac8de53af01663391944cb1a5a228473f2fedc1
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous embedded URLs pointing to external sites, many of which are hosted on domains that appear to be disposable or low-reputation. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically flags this behavior, suggesting a tactic to distribute malicious content or phishing pages across many domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

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://home-plast.ru/foto/files/25209621798.pdf In PDF document text
    • http://huntland.hu/upload/file/fabapore.pdfIn PDF document text
    • https://thietkeweblongan.com/upload/files/57634647613.pdfIn PDF document text
    • http://www.larucheapain.fr/ljk/file/11197699458.pdfIn PDF document text
    • http://creativecoms.net/userfiles/file/78039061387.pdfIn PDF document text
    • https://portalkucharski.pl/app/webroot/media/files/xezowakus.pdfIn PDF document text
    • http://chaputlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/texuw.pdfIn PDF document text
    • http://indigobaby.eu/upload/files/5253231508.pdfIn PDF document text
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/nv5bnts6fefsopp8d9vp5k25c4/11903753143.pdfIn PDF document text
    • http://nyitotthetvege.kastelyszallodak.hu/userfiles/files/56286909172.pdfIn PDF document text
    • http://inventory-acepipe.com/images/uploads/files/84378317728.pdfIn PDF document text
    • https://plagij.at/ckfinder/userfiles/files/zabewuvimerimej.pdfIn PDF document text
    • https://profesa.net/userFilesfile/dajubaf.pdfIn PDF document text
    • http://aromamahabaleshwar.com/ckfinder/userfiles/files/kunezozetifaxotaf.pdfIn PDF document text
    • http://louisefarmersmith.com/admin/ckeditor/ckfinder/userfiles/files/dosawesonowuxibuxap.pdfIn PDF document text
    • https://activepymes.com/pub/file/kizidibeluzi.pdfIn PDF document text
    • http://xyr59.com/filespath/files/20210925134252.pdfIn PDF document text
    • https://andrejc.si/files/file/56039212260.pdfIn PDF document text
    • http://pilanatofishing.com/home/sandbox/domains/shelter.sandbox.tritek.hk/public_html/ckfinder/userfiles/files/86318808324.pdfIn PDF document text
    • http://magdrywall.com/project-new/christianbook/upload_images/file/zuvenuniv.pdfIn PDF document text
    • https://mcdelandes.ca/uploads/file/rolafubujenobevav.pdfIn PDF document text
    • http://perilatomsk.ru/ckfinder/userfiles/files/kixomiku.pdfIn PDF document text
    • http://tcgardening.com/userfiles/file/2021090115490073499.pdfIn PDF document text
    • http://dienlanhhuubinh.com/upload/files/wazab.pdfIn PDF document text
    • https://vespaclubcagliari.com/userfiles/file/zajadajapawapo.pdfIn PDF document text
    • http://4chan.ro/UserFiles/file/83372651162.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=play+store+download+to+laptopPDF 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_off0000b1d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1D3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c9e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9E5 15164 bytes
SHA-256: 3ed9bd242eef556c38a7d56a238418d61c81cb87cd811560654fef9a4be60663
font_02_sfnt_off0000f05f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF05F 10492 bytes
SHA-256: 5b9bae0f9abba4e8536263723e3b81c61164ba5a88ed96a31e18f0ea6ceb4406