Malicious PDF — malware analysis report

Static analysis result for SHA-256 252c224f95414054…

MALICIOUS

PDF

85.1 KB Created: 2021-09-15 22:02:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 7e21036ecc1b6cc2926cdb44eb87ef48 SHA-1: b51cdd98802ffbf17177a92a43c4755287fa2647 SHA-256: 252c224f95414054f74a6ca346827ee3c30a1287cc9adcaa814c0cdf4322d742
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are associated with link farms and disposable hosting, indicating a phishing or redirection scheme. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with attempts to lure users to malicious sites, likely for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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 https://krisoc.ru/uplcv?utm_term=super+smash+flash+beta PDF link annotation
    • https://inverpalmas.com/aym_image/files/28491621341.pdfIn PDF document text
    • http://seattleteriyaki3.com/uploads/files/wopajolij.pdfIn PDF document text
    • https://esterkins.de/ckfinder/userfiles/files/lekisofuju.pdfIn PDF document text
    • http://gniortho.com/files/Upload/file/muvesagagu.pdfIn PDF document text
    • http://kangmeideyiliao.com/uploadfile/file///2021091110522240.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/161316da4bab36---gogagovenisogidikivekabax.pdfIn PDF document text
    • http://ooexperience.be/assets/Image/files/litolofag.pdfIn PDF document text
    • https://thaiwoodengames.com/files/upload/files/19133440118.pdfIn PDF document text
    • http://joomlacode.org/fckeditor/editor/filemanager/img.php?file=file/suvobomejit.pdfIn PDF document text
    • http://longruiglass.com/ckfinder/userfiles/files/20210905_142645.pdfIn PDF document text
    • https://webmakler.org/userfiles/file/sorurixumimoweriwi.pdfIn PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f96c24a29e---jisulir.pdfIn PDF document text
    • http://epoptavky.com/is/images/FCKeditor/File/12146263185.pdfIn PDF document text
    • http://studiogalata.it/userfiles/files/xenotenodagikanigowewef.pdfIn PDF document text
    • http://market-oborudovanie.ru/upload/file/59295067814.pdfIn PDF document text
    • http://mcenterdk.ru/fck_editor_files/files/xamujetopuje.pdfIn PDF document text
    • http://hndgyl.com/v15/Upload/file/202192200242281.pdfIn PDF document text
    • http://chinazzjx.com/d/files/moxagubabilotupor.pdfIn PDF document text
    • https://thietbivesinhanhhuy.com/asset/files/fufexovuxarenijogagu.pdfIn PDF document text
    • https://comptables-publics.fr/userfiles/file/73685769434.pdfIn PDF document text
    • https://vientangluc.com/upload/files/panelobam.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_off0000e788.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE788 18216 bytes
SHA-256: 20eda6b066a9c0aefa1bca60279c3e2920d649a4e8934a1387f820290e8ecd15
font_01_sfnt_off00011752.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11752 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012f69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F69 10620 bytes
SHA-256: fd49ac46242ec85caee764a5563f150a3f399659db209c8984324c982d9a623a

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