Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b9fdd19512deeba…

MALICIOUS

PDF

91.7 KB Created: 2021-09-20 04:48:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 935b86467da16a23f4a08e2d2b8d1023 SHA-1: e83e6a13a9a50dd2ebbb1a32d889fa2004845756 SHA-256: 1b9fdd19512deeba2f5e8b035c8730217da696ae0bd14e51e21ccf1a0ba2c71f
126 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as a phishing trojan and a machine learning classifier also indicated maliciousness. The document contains numerous embedded URLs pointing to various domains, many of which are identified as part of a link farm. One specific URL, http://homeopathyhongkong.cn/files/10073978681.pdf, is highlighted as a link farm on disposable hosting, suggesting a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://homeopathyhongkong.cn/files/10073978681.pdf In PDF document text
    • http://siciny.eu/userfiles/file/59299600096.pdfIn PDF document text
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/3f5fd22666f7b2199ba343ba54d2ea8e/3009319498.pdfIn PDF document text
    • http://koddous.com/userfiles/file/33566847912.pdfIn PDF document text
    • https://thehouseproduction.net/file/dakusowozakojerenadifilob.pdfIn PDF document text
    • http://hoclaixebinhthuan.com/upload/contentFile/file/vebawefipunijomasafarewof.pdfIn PDF document text
    • http://coutleelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/luwakijidafenupovowe.pdfIn PDF document text
    • http://cuuhoatudong.com/upload/files/zaxadukonu.pdfIn PDF document text
    • http://s13cf5ef.alojamientovirtual.com/ropadefutbolbarata/userfiles/file/rufuf.pdfIn PDF document text
    • http://kingbikeonline.com/images/upload/File/35188147650.pdfIn PDF document text
    • https://eminentland.com/admin/userfiles/files/mixodumilexadurinawer.pdfIn PDF document text
    • http://sunnyten.net/userData/board/file/vafuwudexom.pdfIn PDF document text
    • http://indago-rovigo.it/userfiles/files/vomopirusizapajezizuma.pdfIn PDF document text
    • http://aptwash.com/userData/ebizro_board/file/36074911310.pdfIn PDF document text
    • https://odontologosmalca.com/images/userfiles/file/80412941698.pdfIn PDF document text
    • https://learnrkb.jugalbandiresearch.com/ckfinder/userfiles/files/84601519657.pdfIn PDF document text
    • http://bjyhyy.cn/filespath/files/20210901175748.pdfIn PDF document text
    • https://snowcat.pl/admin/ckfinder/userfiles/files/75892089702.pdfIn PDF document text
    • http://xn--80aafkatcapceshpicpg3h.xn--p1ai/pict/file/24921977322.pdfIn PDF document text
    • http://scales-center.com/shop/fck_file/file/57415762637.pdfIn PDF document text
    • http://detikakdeti.ru/img/file/51485861093.pdfIn PDF document text
    • https://alpasol.e-giant.net/upload/files/koloketajekoduwimu.pdfIn PDF document text
    • http://ardennes.proximeo.com/ckfinder/userfiles/files/rodudiwetopumasijibilawox.pdfIn PDF document text
    • https://lacgl.org/upload/editor/file/lumedoja.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=pinoy+movies+online+freePDF 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_off00010531.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10531 10296 bytes
SHA-256: 9ee03c7e80682274e6e3938fbce4a972b3847f9b21a2845c6c70e5e5a674c210
font_01_sfnt_off00011c5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C5A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001346c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1346C 17228 bytes
SHA-256: f29c77afe189ceffeab000e7ec48dcd1c119aafc315f6250811b6d2683a22ae4

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