Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8f7f4b685e5e6ce…

MALICIOUS

PDF

84.2 KB Created: 2021-09-23 05:12:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: bfd5f6bc15d3e7ade0fc2c2fdfb88012 SHA-1: 5d91095e18118c6c21616df714ac3f3856d64d61 SHA-256: d8f7f4b685e5e6ce5184ac599917d7495aa1dd3a8de0a09e2718f1b6a30a560a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The sample was detected as a malicious PDF by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, with one heuristic specifically identifying it as a 'link farm on disposable hosting'. This suggests the document's primary purpose is to redirect users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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 http://blossomtour.net/FileData/ckfinder/files/20210917_294FDFA600AA47B2.pdf In PDF document text
    • http://akwarella.pl/user_uploads/file/puvoju.pdfIn PDF document text
    • https://fultoys.com/userfiles/kigezujupesirokenifujal.pdfIn PDF document text
    • http://tongchangkj.com/uploadfile/file///2021091304123061.pdfIn PDF document text
    • http://ctkupavna.ru/upload/file/sujisemupasi.pdfIn PDF document text
    • http://soskuwait.com/outscapes/admin/ckeditor/uploads/ck/files/45060167127.pdfIn PDF document text
    • http://betonkeritesek.eu/Content/files/kigotutepazapizub.pdfIn PDF document text
    • http://abbeytraining.net/userfiles/file/30912316061.pdfIn PDF document text
    • http://westfallassociates.com/documents/file/popokixanituzaxixesasip.pdfIn PDF document text
    • http://52fotki.ru/ckfinder/userfiles/files/tevegupufesuv.pdfIn PDF document text
    • https://sf-tfi-pgu.uz/wp-content/plugins/super-forms/uploads/php/files/eb99e842450ebacc08a7c597d1256971/fivekan.pdfIn PDF document text
    • http://zavalinka.by/var/upload/file/1057904464.pdfIn PDF document text
    • https://www.whoamiandwhyamihere.com/ckfinder/userfiles/files/40592729877.pdfIn PDF document text
    • http://abwingstop.com/uploads/files/zizosa.pdfIn PDF document text
    • http://fuguchair.com/upfolder/e/files/20210910140727.pdfIn PDF document text
    • https://miltonmattox.com/userfiles/file/89376510438.pdfIn PDF document text
    • http://cafehinglung.com/uploads/files/67064989422.pdfIn PDF document text
    • http://www.advokat.com/app/webroot/img/fck/file/fiwifiwawonusadexago.pdfIn PDF document text
    • http://gro-felix.si/uploads/73445560269.pdfIn PDF document text
    • http://sjar-tech.com/uploadfile/file///2021091023594375.pdfIn PDF document text
    • https://cosmopolitanhotelbg.lastrada.bg/uploads/wysiwyg/files/kumux.pdfIn PDF document text
    • http://guoyangmoju.com/userfiles/files/xaniwodosixas.pdfIn PDF document text
    • http://www.tramag.pl/upload/file/50913669937.pdfIn PDF document text
    • https://anitacalderon.com/ckfinder/userfiles/files/sodapipolakubefatulemef.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=mejores+app+para+ver+tv+por+cable+en+androidPDF 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_off0000daf2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAF2 20560 bytes
SHA-256: 609a520a9fd32c8cb4fa51dc69aa1e1b2eb2fc032b073ad741d2072c99eae89b
font_01_sfnt_off00011074.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11074 10836 bytes
SHA-256: fbcfba2f27ed0eca66fb8edd8902f62cebbb2118c45ee7ebc156e424d5d6f192
font_02_sfnt_off00012962.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12962 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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