Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd7e2baa6e45464d…

MALICIOUS

PDF

86.5 KB Created: 2021-09-12 09:51:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 8abcc346e8c90fa084066b873e3c24dc SHA-1: b1bdcf8e959702b3a0ca325af38ad8d2252f37c3 SHA-256: bd7e2baa6e45464dc1a50e8039b95033205685caa57a41f0d8fb03893d16b453
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. It contains numerous external URLs, many of which are hosted on disposable domains, suggesting a link farm designed to redirect users to malicious content or phishing sites. The presence of embedded URLs and the 'link farm' heuristic strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 https://queure.ru/uplcv?utm_term=stealing+home+sherryl+woods+read+online+pdf PDF link annotation
    • http://kaies.net/upfiles/2109110352065668142o05pz.pdfIn PDF document text
    • http://baikalspring.ru/ckfinder/userfiles/files/jufola.pdfIn PDF document text
    • http://xaydunglenguyen.vn/upload/files/1ca2e8.pdfIn PDF document text
    • http://angelascanu.it/uploads/file/sifogamozubogox.pdfIn PDF document text
    • https://momentous-inst.com/uploads/image/files/neluju.pdfIn PDF document text
    • https://titishop.co/upload/files/87874613074.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/19197083127.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/ijgph0rdnt9v7j9bjf8o27u718/3316278550.pdfIn PDF document text
    • http://stickerbarcode.com/file_media/file_image/file/jukopulusitukibux.pdfIn PDF document text
    • http://le-bouquet.be/userfiles/files/derorudewugu.pdfIn PDF document text
    • http://dohertylaw.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/45785165542.pdfIn PDF document text
    • http://rcp-ranstadt.us/files/76520461150.pdfIn PDF document text
    • http://dinskayarealty.ru/media/file/73358876659.pdfIn PDF document text
    • http://magogaralbamoble.com/galeria/files/61688861660.pdfIn PDF document text
    • http://vinhomeshaiphong.net/app/webroot/img/files/20763354854.pdfIn PDF document text
    • http://aaz.sk/editor_uploads/files/goduvav.pdfIn PDF document text
    • http://tcyy88.com/userfiles/file/2021090901020173499.pdfIn PDF document text
    • https://beautydiction.com/ckfinder/userfiles/files/14985896832.pdfIn PDF document text
    • http://samtle.net/ckupload/files/wobatalularazijuwumasiku.pdfIn PDF document text
    • http://rafaelstore.ru/upload/files/kipirukilobusodasisipid.pdfIn PDF document text
    • http://marcus-1.com/FileData/ckfinder/files/20210909_AA1C94F7164A6029.pdfIn PDF document text
    • https://rsvforum.com/userfiles/file/84756939410.pdfIn PDF document text
    • http://yyfxsw.com/upload/files/2860077730.pdfIn PDF document text
    • http://levotst.com/uploads/files/zabewesona.pdfIn PDF document text
    • http://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161375f9311e60---zilekufurutevukeluri.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_off0000eced.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECED 17312 bytes
SHA-256: e5d3f6df030f0205beaa157a8c206770f45b70db160f6dc30bbbe41957cecd7b
font_01_sfnt_off000119b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119B2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000131c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131C9 11220 bytes
SHA-256: 430d3341baeb26f9acb4d3ff209ff528396c90712a576f70831a212750cfffbc