Malicious PDF — malware analysis report

Static analysis result for SHA-256 9e14cdf9d08c2eb9…

MALICIOUS

PDF

79.2 KB Created: 2021-09-20 22:19:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: f6702ed4f41525b369dc09931d842f26 SHA-1: 0cf2889df8dbdba97fa1305edc856ce44a128f7c SHA-256: 9e14cdf9d08c2eb9aab6370e9f1503176c768a3ab160937b310cbecae2f54303
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which point to suspicious PDF files hosted on various domains, suggesting a link farm or redirection mechanism. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a tactic to obscure the true destination. While no scripts were explicitly extracted, the nature of the embedded URLs and the detection suggests the PDF is designed to redirect users to potentially harmful sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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://platypusspot.org/uploads/ckfinder/userfiles/files/sarubokupa.pdf In PDF document text
    • http://career-id.org/ckfinder/userfiles/files/92715057769.pdfIn PDF document text
    • https://doanandieuduong295doson.vn/namthuan/images/news/files/dibanofuzuderiveri.pdfIn PDF document text
    • http://webcertain.asia/contentupload/fckeditorUploads/organization_/file/tagab.pdfIn PDF document text
    • http://alacarte-design.de/userfiles/file/dedav.pdfIn PDF document text
    • http://wingprocess.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/wanerixa.pdfIn PDF document text
    • https://ermolino.mebel18.com/uploads/files/baxubunugazabizetafeva.pdfIn PDF document text
    • https://coopinproject.eu/ckfinder/userfiles/files/rudekatineforo.pdfIn PDF document text
    • http://www.eurosecurimed.com/ckfinder/userfiles/files/16809542317.pdfIn PDF document text
    • http://star-transform-moscow.ru/uimg/files/nasofojel.pdfIn PDF document text
    • http://chpcentre.com/files/file/wigaripilaki.pdfIn PDF document text
    • http://alarmy-kamery24.pl/userfiles/file/loxedoposexivukavibugop.pdfIn PDF document text
    • https://bleikss.com/userfiles/file/kavobiji.pdfIn PDF document text
    • http://asr-net.ru/uploads/files/5271233813.pdfIn PDF document text
    • https://bongkartuantakur.com/contents/files/90868760192.pdfIn PDF document text
    • http://school19-zav.ru/userfiles/file/76084358429.pdfIn PDF document text
    • http://kruengrangthai.com/files/files/60880167747.pdfIn PDF document text
    • http://familiegravesen.dk/ckfinder/userfiles/files/35771306797.pdfIn PDF document text
    • http://saharun.org/uploads/ckfinder/userfiles/files/tukosibamo.pdfIn PDF document text
    • http://aquamedia.cn/ckfinder/userfiles/files/zofofikid.pdfIn PDF document text
    • https://happycondo.leaddeehub.com/userfiles/files/lakirofax.pdfIn PDF document text
    • https://hw-power.com/uploads/ckfiles/files/613ef4bb5e4a4.pdfIn PDF document text
    • http://www.euro-fly.eu/userfiles/files/nusizidadesalojizodo.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613dd45a03757---98724957706.pdfIn PDF document text
    • http://sensitiva.fi/UserFiles/File/fameturuwabutobogi.pdfIn PDF document text
    • http://ijfbn.com/editor_up/pofigaterabenera.pdfIn PDF document text
    • http://dawahcity.com/userfiles/file/28477996192.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=how+to+cast+phone+screen+to+computerPDF 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_off0000d274.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD274 16940 bytes
SHA-256: 69fd8cc7f2cc2a5efffbeaf0bb0166f49b747c9e6565b24b3f172b128349aa68
font_01_sfnt_off0000fe25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE25 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001163c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1163C 10680 bytes
SHA-256: ee08480bd72724a4faa7187e775a33082a0da95cf5b0934f6563cf8162230de9