Malicious PDF — malware analysis report

Static analysis result for SHA-256 a49370dbb8b092fd…

MALICIOUS

PDF

126.0 KB Created: 2021-11-12 20:36:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: f17de6ecbd821b1357b93ece6db5f4e7 SHA-1: 4856d7aa94ceda2d3bacfa4a7225ccddd5064370 SHA-256: a49370dbb8b092fd495f713ae6961ff8529df585104753cc0341db077546ccbc
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan threat. It contains numerous embedded URLs, with one specifically identified as a link farm on disposable hosting, suggesting an attempt to redirect users to malicious content. Although no scripts were directly extracted, the PDF structure and embedded links are indicative of a phishing lure, likely intended to deliver a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://noospc.ru/SITE/files/editor/file/nuzagoziberalelisobesosex.pdf In PDF document text
    • http://beastyenergy.com/userfiles/file/71034222803.pdfIn PDF document text
    • http://www.wm-meyer.de/meyer/admin/editor/ckfinder/userfiles/files/14015053773.pdfIn PDF document text
    • http://thewhitmerlawfirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/79915064124.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613616af88405---59998706163.pdfIn PDF document text
    • https://smartbrand.ro/mm/file/pumezofefaruwezisaxu.pdfIn PDF document text
    • http://ballarioarchitetti.eu/userfiles/files/17885611491.pdfIn PDF document text
    • http://easy-sleep24.de/shop/images/editorfiles/file/91726351424.pdfIn PDF document text
    • https://ises.ca/phpsites/vertical_living/uploads/file/33784054815.pdfIn PDF document text
    • http://madmojo.com/fckupload/file/37971738649.pdfIn PDF document text
    • http://hophungvietnam.com/app/webroot/uploads/files/33326365340.pdfIn PDF document text
    • http://lt101shop.com/userfiles/files/xareja.pdfIn PDF document text
    • https://quangcaowebsite.vn/uploads/files/kojelikijupevajexalo.pdfIn PDF document text
    • http://studiolegalebisantis.it/userfiles/files/puwumesiwutarap.pdfIn PDF document text
    • https://xn--80adj7cxa.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/079a0988032c8ff5f881aff5e370a7b1/letimotivalo.pdfIn PDF document text
    • http://thuaphatlailongthanh.com/upload/contentFile/minhchau/file/vumubuwamoxekukaj.pdfIn PDF document text
    • http://tc-muehlacker.de/data/tcmuehlacker/userfiles/file/84817901944.pdfIn PDF document text
    • http://ryanoomen.nl/uploadimages/files/28398319480.pdfIn PDF document text
    • https://ilonew.tasksplan.com/userfiles/files/fazewidogomivapegew.pdfIn PDF document text
    • http://orenprom.com/img/account/file/27501519121.pdfIn PDF document text
    • http://gemcom.org/userfiles/file/942259568.pdfIn PDF document text
    • http://boothbayharborshipyard.com/userfiles/file/77312788440.pdfIn PDF document text
    • https://vandolderskb.com/images/usr/33425528545.pdfIn PDF document text
    • http://feedproxy.google.com/~r/Xvkpad/~3/TSvcnjQ06Jg/uplcv?utm_term=top+100+grossing+movies+of+all+timePDF 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_off00018585.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18585 16540 bytes
SHA-256: 45015263e28dbf00792e0fa83ae0fb9123af5110209f191c00797c49350166ef
font_01_sfnt_off00019cab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19CAB 10904 bytes
SHA-256: 3d89c5953222c8ae02fdf9a973b1cee6e59e50405b0739548b68d1adda4afaf4
font_02_sfnt_off0001b5f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B5F0 19856 bytes
SHA-256: 1ab40c328dce01244bf7bc0aafa358d07819e9fc7b3c0cc8ada4933f135522f1