Malicious PDF — malware analysis report

Static analysis result for SHA-256 2be4f86e330c96da…

MALICIOUS

PDF

74.4 KB Created: 2021-09-11 02:05:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 49a1de681956c50a75468395facfa83c SHA-1: 97270c4772477305029273f533950b8d6680b792 SHA-256: 2be4f86e330c96da0ffae30190d19e1b1c7618805f727b6b8f2fe0dd6124be6a
126 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many pointing to suspicious domains, and one heuristic specifically identified it as a link farm. This suggests the primary purpose is to redirect users to potentially harmful content or further malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://moyamoya.center/images/hand_uploaded/files/63592864666.pdf In PDF document text
    • https://duongthuy.net/userfiles/file/93659547015.pdfIn PDF document text
    • https://ladangmimpi2.com/contents/files/75529834628.pdfIn PDF document text
    • http://www.pethouse.es/ckfinder/userfiles/files/kizumevusuzam.pdfIn PDF document text
    • http://www.binghan.my/userfiles/file/dewudiregixozetapibos.pdfIn PDF document text
    • https://aymexco.eu/ckfinder/userfiles/files/65065018730.pdfIn PDF document text
    • https://amgaa.org/temp/files/fakoxorukezigo.pdfIn PDF document text
    • https://losungversorger.com/product/file/36143530794.pdfIn PDF document text
    • https://floridahouselottery.com/test/userfiles/file/86495272988.pdfIn PDF document text
    • http://land89.com/ckupload/files/73795075838.pdfIn PDF document text
    • http://iwilldoit.ru/uploads/files/files/mipivudotupo.pdfIn PDF document text
    • http://cl-pub.com/files/files/3911259749.pdfIn PDF document text
    • https://webmenuplus.com/images/file/20622633497.pdfIn PDF document text
    • https://www.aledrukujemy.pl/ckfinder/userfiles/files/kipud.pdfIn PDF document text
    • https://kirmatas.com/userfiles/file/79517437794.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/16139b2a734c7a---kerazuwugejo.pdfIn PDF document text
    • http://ordineveterinarireggioemilia.it/userfiles/files/vobot.pdfIn PDF document text
    • http://gadkowski.pl/repository/filemanager/file/27955594975.pdfIn PDF document text
    • https://khangle.vn/uploads/images/files/pabefozuvimiwevejakesi.pdfIn PDF document text
    • http://licorne-hotel-restaurant.com/userfiles/file/pozaxenigixitemike.pdfIn PDF document text
    • https://netwindowvn.com/uploads/userfiles/file/37928963045.pdfIn PDF document text
    • https://profipreklady.cz/www/ckfinder/userfiles/files/wuxivepik.pdfIn PDF document text
    • https://badeluxe.com/userfiles/files/pomasobo.pdfIn PDF document text
    • https://get-insurance.in/ckfinder/userfiles/files/81538034453.pdfIn PDF document text
    • https://evrenmentese.com/upload/ckfinder/files/95384520653.pdfIn PDF document text
    • http://guidesdugrandlarge.fr/images/import/file/povigijiwujininuzo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=past+perfect+simple+pdfPDF 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_off0000c0e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC0E6 10556 bytes
SHA-256: a8677a87181651c8dc9ffbeb277acf5f98046bcbe1abddf98c46108682f3a456
font_01_sfnt_off0000d8fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8FA 17012 bytes
SHA-256: 6ca5ab3c1396693be3d566bf8403425f972756a70edac4a8e9de4edc39242792
font_02_sfnt_off00010436.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10436 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1