Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7febe55caff0d79…

MALICIOUS

PDF

81.6 KB Created: 2021-09-18 17:47:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 12756fb472fa4d10837c8f34a6e665c4 SHA-1: c6dea7e130cbf816007956efd1507fca4890dca8 SHA-256: c7febe55caff0d793e54597c0411866712464bb47388d8c6f166de7a8a3f1389
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by a machine learning classifier and ClamAV as malicious, indicating a high likelihood of malicious intent. The presence of numerous embedded URLs pointing to PDF files on various domains, combined with a heuristic indicating a 'Visual download / call-to-action button lure', suggests the document is designed to trick users into downloading further malicious content. The document body is heavily obfuscated and unreadable, preventing a more detailed analysis of its specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://rosedreamholidayhomes.com/ckfinder/userfiles/files/34915899577.pdf In PDF document text
    • https://sieuthimayphat.com/ckfinder/userfiles/files/38946054839.pdfIn PDF document text
    • https://mantyobras.com/userfiles/file/jimekivugomakipafoxele.pdfIn PDF document text
    • http://apisicul.com/userfiles/files/nopijigesibimijuviw.pdfIn PDF document text
    • http://w-mill.jp/images/file/varabivexi.pdfIn PDF document text
    • http://hoteldanang.com/uploads/images/files/solinel.pdfIn PDF document text
    • http://orosweb.hu/ckfinder/userfiles/files/wemokajopevalikunaz.pdfIn PDF document text
    • http://isisthailand.org/file_media/file_image/file/39000582123.pdfIn PDF document text
    • http://www.smartlandgroup.com/ckfinder/userfiles/files/48945160390.pdfIn PDF document text
    • https://khogiaydantuonghanquoc.com/images/news/file/gabobuzud.pdfIn PDF document text
    • http://northmarking.com/userfiles/files/25340770240.pdfIn PDF document text
    • http://emanuelmlevin.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/42016008023.pdfIn PDF document text
    • http://emotionpicturesfestival.gr/userfiles/file/72803861969.pdfIn PDF document text
    • http://cargologicru.com/sadm_files/guzuzutasafu.pdfIn PDF document text
    • http://transcash.com/ci/userfiles/files/63143246737.pdfIn PDF document text
    • http://lamekatus.ee/uploads/ckeditor/files/77005895661.pdfIn PDF document text
    • https://cryptobasics.biz/uploads/files/64205528804.pdfIn PDF document text
    • http://balassalaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/64370975717.pdfIn PDF document text
    • http://mjacz.cz/soubory/files/28029381285.pdfIn PDF document text
    • http://global-leasing-management.com/uf/file/53677989824.pdfIn PDF document text
    • http://kyanite.tv/userfiles/file/37478436429.pdfIn PDF document text
    • http://anhuishangbiao.com/upload_fck/file/2021-9-7/20210907000530102696.pdfIn PDF document text
    • https://umutisi.com/umut/upload/files/mulikizokased.pdfIn PDF document text
    • http://malagi.pl/user-files/fck/file/nefojunetefojo.pdfIn PDF document text
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/lq1bac5hsfdkkni1u5n6ug76ms/84365627895.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=gta+sa+compressed+obb+filePDF 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_off0000db3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB3E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f355.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF355 10856 bytes
SHA-256: 2ee16a506a42cbf39dd4ef8962cb3c70b4943d143081f74a6ae20d08b9d895ec
font_02_sfnt_off00010c2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C2B 17184 bytes
SHA-256: ce68ab0c63838758ffe12cfd7205a9539fac981c74cfbd5602bfeb30375d70ff