Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4e61756bc61cb15…

MALICIOUS

PDF

74.3 KB Created: 2021-09-27 19:02:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 29c696431ee0962ff347594937b510f5 SHA-1: dce0bdf6ab0d05e8cfc42442ccf10e44b97bec17 SHA-256: d4e61756bc61cb153d439202f86d74e7bbe288fb6921f630af9834dd2ef9aa2b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by multiple heuristics, including ML classification and ClamAV, as malicious. It contains numerous embedded URLs, many of which are part of link farms or hosted on disposable domains, suggesting a phishing or malware distribution scheme. The PDF's structure and embedded URIs indicate it is designed to redirect users to potentially harmful websites, likely for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://archism.ru/uplcv?utm_term=word+doc+to+pdf+mac PDF link annotation
    • http://alajwakh.com/uploaded_files/userfiles/files/xejez.pdfIn PDF document text
    • https://armature.ir/cache/fck_files/file/94106080126.pdfIn PDF document text
    • http://ultrabeauty-ff.ru/userfiles/file/varujawuxugirowuwiv.pdfIn PDF document text
    • https://watfordfairtrade.org/app/webroot/img/files/23263634870.pdfIn PDF document text
    • http://marketingnews.fr/images/file/farotu.pdfIn PDF document text
    • http://www.ochoadentalcare.com/tacgestorcontenidos_ochoa/documentos/file/In PDF document text
    • https://sukienmiennam.com/userupload/files/zizoreguxoriwepuf.pdfIn PDF document text
    • http://joyandwowbook.com/upload/file/funegadunezofeneb.pdfIn PDF document text
    • https://learningsolution.ca/userfiles/files/mapegivorazupekunoxog.pdfIn PDF document text
    • http://metamorfozyayincilik.com/userfiles/file/40546374477.pdfIn PDF document text
    • https://ozmutludokum.com/userfiles/file/25628272887.pdfIn PDF document text
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1614d852532c2d---26516047455.pdfIn PDF document text
    • https://kueapem.com/contents/files/wafawezibowatug.pdfIn PDF document text
    • http://klaaswester.nl/img/file/37874499764.pdfIn PDF document text
    • http://wangyiphk.com/userfiles/95386898612.pdfIn PDF document text
    • https://lockerova.eu/admin/upload/documents/basupelozobowes.pdfIn PDF document text
    • https://myshalewell.com/userfiles/file/korigegovatowo.pdfIn PDF document text
    • http://aquamedia.cn/ckfinder/userfiles/files/855945355.pdfIn PDF document text
    • https://singhaniabrothersltd.com/ckeditor/ckfinder/userfiles/files/45439102665.pdfIn PDF document text
    • http://mtsskzy.com/userfiles/file/4417046803.pdfIn PDF document text
    • http://mannaz.pl/userfiles1/file/tatifatonurisatif.pdfIn PDF document text
    • http://primaneighbors.com/userimages/tufenufolewogoduwalu.pdfIn PDF document text
    • https://pre-www.bridge-college.com/uploaded/ckeditor/files/fasozezetuwanurujalotutij.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_off0000bb44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB44 19376 bytes
SHA-256: b774b6d4280ed6e2f61a1ee99031ab9014b02f7f8eb4762fa62b2052efed5975
font_01_sfnt_off0000ece8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECE8 10232 bytes
SHA-256: a691a8e6e7e16b82791a9ac3d1e3f064eb407e7fca3c55ca8499b2d3298e7324
font_02_sfnt_off000103ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103ED 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1