Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5a5efc4bc7bea95…

MALICIOUS

PDF

86.3 KB Created: 2021-09-11 12:48:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 731437ade5bd1a22fa22a98afec6b480 SHA-1: 6950bac104a557e91ef6f5a8f9c61c6e3fa1b536 SHA-256: c5a5efc4bc7bea95c8c01c7f42c8aeeb5ddb047bcdb47191944df333cb9f24a1
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to a suspicious PDF hosted on a disposable domain. The presence of numerous embedded URLs, many pointing to potentially compromised or malicious sites, reinforces the phishing and malware distribution intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://e-kva.ru/admin/ckfinder/userfiles/files/mekizoburorumex.pdf In PDF document text
    • http://pujcovnanaradi-tvarozna.cz/userfiles/files/99966426160.pdfIn PDF document text
    • http://hondatayho.vn/images/ckeditor/files/vomebitimidoxaz.pdfIn PDF document text
    • http://pilot-market.ru/new/files/file/32401254141.pdfIn PDF document text
    • https://www.wemservice.com/ckfinder/userfiles/files/rulusasisowow.pdfIn PDF document text
    • http://emblem4home.com/UserFiles/Member/File/89597041550.pdfIn PDF document text
    • https://artedeeducar.com.br/ckfinder/userfiles/files/8065574583.pdfIn PDF document text
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/161311df35e335---jumilubolabo.pdfIn PDF document text
    • http://www.pethouse.es/ckfinder/userfiles/files/59225948711.pdfIn PDF document text
    • http://alphasigmaoverseas.com/userfiles/file/vefekub.pdfIn PDF document text
    • https://sierrainstruments.cn/fckeditor/editor/filemanager/connectors/php/fckeditor/upload/202109/file/32971281670.pdfIn PDF document text
    • https://hobbes-group.com/upload/files/73256157882.pdfIn PDF document text
    • http://alpes-de-haute-provence.proximeo.com/ckfinder/userfiles/files/fibunavavidinoxinuni.pdfIn PDF document text
    • http://tantusmarina.com/UserFiles/file/86617738336.pdfIn PDF document text
    • http://azstorestudio.com/uploads/files/tomofixa.pdfIn PDF document text
    • http://mpwlawpa.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/tapotexuka.pdfIn PDF document text
    • https://amoslodge10-org.alljobsinliberia.com/ckfinder/userfiles/files/4865239639.pdfIn PDF document text
    • https://www.traitagri-solutions-alternatives.fr/ckfinder/userfiles/files/71044608454.pdfIn PDF document text
    • http://denis-lefebvre-services.com/fichiers/file/17805970788.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134ede9e06ac---20812650644.pdfIn PDF document text
    • http://duhochoangthanh.com/upload/files/41275788976.pdfIn PDF document text
    • http://velomagazin.hu/UserFiles/file/28560323868.pdfIn PDF document text
    • http://haisushitogo.com/uploads/files/7314880065.pdfIn PDF document text
    • http://oguzlarotomatiksanziman.com/depo/sayfaresim/file/33256974412.pdfIn PDF document text
    • https://foundationkuzmanov.com/files/wovexozofuwudijunil.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=jim+collins+flywheel+pdfPDF 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_off0000e9eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9EB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010202.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10202 10716 bytes
SHA-256: f35be7373f723dceacc17d9d38541cb2ff8e5c87ff9a6f03526369c93672bfa4
font_02_sfnt_off00011a70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A70 19124 bytes
SHA-256: 77f619302d2edaa63ce33b8c7db77a611d21bb63a7e0a1568586a18621d80750