Malicious PDF — malware analysis report

Static analysis result for SHA-256 0cd6a34096c6892d…

MALICIOUS

PDF

68.1 KB Created: 2021-09-17 14:23:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: ea087891c59aa88a4abb77f308db0dc4 SHA-1: b3eb316300d8adcf76635bd7e45baf702082aaca SHA-256: 0cd6a34096c6892df26fc675517023db765262ef2477a3d7c114a159711a1eb9
126 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document contains numerous links to disposable hosting, suggesting a phishing or malware distribution attempt. The embedded URLs point to various unknown domains, reinforcing the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://luatsugiadinhviet.com/upload/ck/files/47827862048.pdf In PDF document text
    • https://tiklatakip.com/calisma2/files/uploads/87046126432.pdfIn PDF document text
    • http://makrostal.pl/user_images/file/30193198625.pdfIn PDF document text
    • http://e5tbr.alruaa.com/ckeditor-ckfinder-integration/uploads/files/20008816198.pdfIn PDF document text
    • http://enidental.com/userfiles/file/20210902054603.pdfIn PDF document text
    • https://lsv-wittlage.de/ckfinder/userfiles/files/nobesowofotenirakar.pdfIn PDF document text
    • http://rulife.ru/ckfinder/userfiles/files/26292112133.pdfIn PDF document text
    • http://www.iuoelocal870.com/kaizen/ckfinder/userfiles/files/56950278446.pdfIn PDF document text
    • http://gokea.org/upload/editor/files/7767841463.pdfIn PDF document text
    • http://thrifthelp.com/flash/thrifthelp.com/file/wakorikexudaxiduzoj.pdfIn PDF document text
    • https://eyetracking.pl/userfiles/file/40023751910.pdfIn PDF document text
    • http://dichvuhieuchuan.com/upload/files/59990007619.pdfIn PDF document text
    • http://architects-desk.com/uploadsfile/17522123269.pdfIn PDF document text
    • https://ilonew.tasksplan.com/userfiles/files/38276275525.pdfIn PDF document text
    • https://ncsccalgary.com/userfiles/files/jazufolituzudaruwizabar.pdfIn PDF document text
    • https://radekslodkiewicz.pl/files/file/jusoviril.pdfIn PDF document text
    • https://gtijsr.com/userfiles/file/ponavobavunixogazepa.pdfIn PDF document text
    • https://gesema.com/UserFiles/file/13192508325.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1614417b7dee65---97825148461.pdfIn PDF document text
    • http://tottazo.com/userfiles/file/18910518617.pdfIn PDF document text
    • https://jxlmedu.com/file/files/20210914_175652.pdfIn PDF document text
    • http://buyyoutubecomments.com/ci/userfiles/files/89889936990.pdfIn PDF document text
    • https://find-domain.lazy-online-shop.com/app/webroot/userfiles/files/fupizirozan.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=app+cloner+app+downloadPDF 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_off0000b01b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB01B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c82d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC82D 14232 bytes
SHA-256: 620ed22db1c906b7eda7ed433b577ecfdd3752fd72293482933fb9ccfe89154c
font_02_sfnt_off0000ebbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBBE 10216 bytes
SHA-256: 57425e32d56eb647e6c012dad73e0e0f04af7f8285c1a870bb12eb9dd819148c