Malicious PDF — malware analysis report

Static analysis result for SHA-256 8dfa0c7ea2f25787…

MALICIOUS

PDF

81.3 KB Created: 2021-09-09 21:09:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 3344374c845daae35e6acacf2740cb58 SHA-1: 331a7d3e38507d0ad65d83609876f506ada2f241 SHA-256: 8dfa0c7ea2f25787ef05642bfdb1f364ca0e9f1970c92e6db88da5fd3d4a4276
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document contains numerous links to disposable hosting, suggesting a phishing or malware distribution scheme. While no scripts were extracted, the presence of many unknown URLs points to an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://busankid.com/webfiles/board/file///79600770569.pdf In PDF document text
    • https://aparcaderoshaddaichile.cl/uploads/images/files/58660706114.pdfIn PDF document text
    • https://www.hmgfinance.com/ckfinder/userfiles/files/jezobizenivuditejezegob.pdfIn PDF document text
    • https://knoxvilleremembers.com/media/pozegefu.pdfIn PDF document text
    • https://adesso-moosburg.de/images/file/sovegesisatinux.pdfIn PDF document text
    • http://trunglam.vn/uploads/userfiles/file/39823181914.pdfIn PDF document text
    • http://ranjitabiswas.com/userfiles/files/32911530113.pdfIn PDF document text
    • http://paletydozahrady.cz/ckfinder/userfiles/files/zofozemeke.pdfIn PDF document text
    • http://taemyung.com/data/upload/file/34148216087.pdfIn PDF document text
    • https://ensegun2.com/ckfinder/userfiles/files/kadoxojobusadobitux.pdfIn PDF document text
    • http://ibtaker.ps/userfiles/file/wisorifufoduz.pdfIn PDF document text
    • http://madveras.com/ckfinder/userfiles/files/6553182222.pdfIn PDF document text
    • http://tatnhapkhau.com/ckfinder/userfiles/files/tewidoxijinonafozafafefe.pdfIn PDF document text
    • http://zonazero.es/userfiles/file/fufuvamigaluvu.pdfIn PDF document text
    • https://ristovski.mk/public_html/upload/userfiles/file/ranuroroligopumililubo.pdfIn PDF document text
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/4s9gu8kitf0n50n6pq0h63bs63/fudirotabakiwonebi.pdfIn PDF document text
    • http://noithatsah.com/webroot/img/files/20126958329.pdfIn PDF document text
    • http://varosom.hu/userfiles/files/41445628506.pdfIn PDF document text
    • http://www.laterveer-biesenbeek.nl/ckfinder/userfiles/files/memozabifaponodokopazaz.pdfIn PDF document text
    • https://mcq-exambd.com/app/webroot/ckfinder/userfiles/files/xovulo.pdfIn PDF document text
    • http://hotstamping.pl/files/file/papotaxizivefifusedu.pdfIn PDF document text
    • https://ku4ysk-9lgp4y.com/contents/files/wugabusirexikozenazuzuja.pdfIn PDF document text
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/0114b0126e50c3a79a0b6746378b5c17/91960704993.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=best+police+scanner+app+freePDF 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_off0000da6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA6C 17376 bytes
SHA-256: af4a1ccc83a73ef806326937bd537f68f89a8ec9413bc48d909409986fcfd077
font_01_sfnt_off000107b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107B7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011fce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FCE 10524 bytes
SHA-256: 3e6bfd29d3ba643f2d667e99cdb857f02436bee2f85677fa32a003208e68b060

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