Malicious PDF — malware analysis report

Static analysis result for SHA-256 a264e0ff995b1044…

MALICIOUS

PDF

74.0 KB Created: 2021-09-09 19:14:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 0d79cac5202aa53e7e1a15a2326cab00 SHA-1: 0822bab0c8f296cb36394fb55a0ce8f137cbf785 SHA-256: a264e0ff995b1044d6d5a68dc9330578fbbe6fcda9f697358038b80e497c6b43
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many of which point to disposable domains and are structured as a link farm, suggesting a phishing or malware distribution campaign. The presence of external URIs and the link farm heuristic strongly support this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 https://coretry.ru/uplcv?utm_term=how+to+show+notifications+on+lock+screen PDF link annotation
    • http://ttmm.co.jp/ckfinder/userfiles/files/85555936620.pdfIn PDF document text
    • https://confeccionesruiz.cl/UserFiles/File/37216355843.pdfIn PDF document text
    • http://www.sloepverhuur-debiesbosch.nl/upload/files/tisixegurawujovaximof.pdfIn PDF document text
    • http://dancephoto.ru/userfiles/files/58424918947.pdfIn PDF document text
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139780430999---bomire.pdfIn PDF document text
    • http://knowleangling.co.uk/ckfinder/userfiles/files/podozuwaxomizux.pdfIn PDF document text
    • https://coolinterier.sk/upload/files/76285705773.pdfIn PDF document text
    • https://topinsolventa.ro/userfiles/file/vijudipabad.pdfIn PDF document text
    • http://mawaevents.com/uploads/file/43955298467.pdfIn PDF document text
    • http://www.egymast-segito.hu/uploaded/fck/file/87558398347.pdfIn PDF document text
    • http://spartaksedlec.cz/spartaksedlec/userfiles/file/geguxago.pdfIn PDF document text
    • https://ms1oke.com/contents/files/bogasuvujatixavo.pdfIn PDF document text
    • http://mmprogetti.it/userfiles/files/77143628565.pdfIn PDF document text
    • http://eclickapps.in/userfiles/files/54496339050.pdfIn PDF document text
    • http://gavinlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/68525017992.pdfIn PDF document text
    • https://grootformaatspandoeken.nl/userfiles/file/1183593271.pdfIn PDF document text
    • http://dentish.ru/ckfinder/userfiles/files/pukekajetisibes.pdfIn PDF document text
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613632a3affb9---50123402431.pdfIn PDF document text
    • https://europacreativaeuskadi.eu/files/galeria/files/20384891756.pdfIn PDF document text
    • https://www.elshandmadedesign.nl/ckfinder/userfiles/files/xilosopetepikejejekifeki.pdfIn PDF document text
    • https://pontus-sd.eu/uploads/file/megabazogezivedebegupo.pdfIn PDF document text
    • https://sogelec-eng.com/files/ckfinder/files/kusuvaramurosukasijije.pdfIn PDF document text
    • https://sklepbonus.eu/userfiles/file/pogemexofepepu.pdfIn PDF document text
    • http://muabannhagiare.net/images/uploads/files/tikisinuzowaki.pdfIn PDF document text
    • https://burstallconrad.com/editor_files/file/korisifexilupuvategepoge.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_off0000bd1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD1F 10600 bytes
SHA-256: 065d349d82a08c762529505a90d309fc1415ee0b0f72e5f71f25d925c58d1b16
font_01_sfnt_off0000d550.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD550 17192 bytes
SHA-256: d61701ea86ec2be2fee662f0fdca96e374b46bd636837b617ec8f9934e35b045
font_02_sfnt_off00010217.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10217 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1