Malicious PDF — malware analysis report

Static analysis result for SHA-256 e7cb342b123e3cd6…

MALICIOUS

PDF

69.3 KB Created: 2021-09-28 00:53:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 63b98d21220dd9076409944fc704195a SHA-1: 488046151b2248ed5c36c468780808c92c098bca SHA-256: e7cb342b123e3cd62fe3f493455f7184dc1b87a3d37af14020ead352bdeb1703
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document is designed to host numerous links, likely for SEO manipulation or to distribute further malicious content. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristics point towards a phishing or content distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 https://superlitefan.com/uploads/files/89130097171.pdf In PDF document text
    • https://thietbixaydungcantho.com/canthomobile2/public/images/sanpham/files/55653777569.pdfIn PDF document text
    • http://posicert.com/upload_fck/file/2021-9-17/20210917222924868275.pdfIn PDF document text
    • http://khyljg.com/uploadfiles/files/70672385455.pdfIn PDF document text
    • http://fred-robin.com/ckfinder/userfiles/files/82754909101.pdfIn PDF document text
    • http://hotel-gerard-dalsace.com/upload/document/2527231790.pdfIn PDF document text
    • http://avatars.ru/userfiles/file/83130275850.pdfIn PDF document text
    • http://scouttautomotive.com/editor_uploads/system/files/mezolunofapeniwe.pdfIn PDF document text
    • http://grgct.com/ckfinder/userfiles/files/4265746646.pdfIn PDF document text
    • https://functionalmovement.gr/wp-content/plugins/super-forms/uploads/php/files/22e567ba74227e412f7e8d74f6fc1cb2/gomotifavasigog.pdfIn PDF document text
    • http://prograsifkalip.com/files/kuvijudinoparapudoji.pdfIn PDF document text
    • http://nsfeed.com/_UploadFile/Images/file/27240449059.pdfIn PDF document text
    • https://dm288.com/slicice/file/wasagopipazegezugamuvi.pdfIn PDF document text
    • https://stiff.pl/ckfinder/userfiles/files/xisujimijudezexakini.pdfIn PDF document text
    • http://moscow-vernisage.com/files/files/10909035915.pdfIn PDF document text
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/870667fadead3b602b54385ee6456ae4/volum.pdfIn PDF document text
    • http://ggbris.com/slbdavbatala/userfiles/file/zanuviwi.pdfIn PDF document text
    • https://editora-arara-azul.com.br/site/admin/ckfinder/userfiles/files/24125110092.pdfIn PDF document text
    • http://martom24.pl/martom/userfiles/file/bumovewidakakozirilezixo.pdfIn PDF document text
    • http://mfahk.com/upload/files/sefimekuzawakanubu.pdfIn PDF document text
    • http://www.slappedtogether.com/editoruploadfiles/file/ponodutajaxobumoxavux.pdfIn PDF document text
    • http://villa-margherita.biz/userfiles/files/roserixepuxofipiwigika.pdfIn PDF document text
    • http://xn----9sbbnbtte4cyg.xn--p1ai/ckfinder/userfiles/files/xuzamudofesikojuloma.pdfIn PDF document text
    • https://campfun.myhost888.com/upload/ckeditor/files/kanevuzepifavefuwumulub.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=fun+free+games+that+are+not+blockedPDF 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_off0000afdd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFDD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c7ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7EF 15172 bytes
SHA-256: 1c59371e69445b84cccdf023ce26bcd1a2507d75d48401d6022b2bcc0a5c3f08
font_02_sfnt_off0000ee0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE0E 11140 bytes
SHA-256: b9a1c61984c3720d1e1a3a4caa21e807a40a7b942419179ceb712bd6b7082f31