Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe5bd3ed7b712b21…

MALICIOUS

PDF

81.2 KB Created: 2021-09-23 11:51:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 5fba16a6c0c6de31c8d0aed04c1e059b SHA-1: 658c6451e358734f39fe8f43ff75bcacdb8d8cf9 SHA-256: fe5bd3ed7b712b21949c9e81ef4d81ab674401849b1d01c2b63dc4c5ac2a35c5
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The presence of numerous embedded URLs, many pointing to disposable domains and employing UTM parameters, strongly suggests a phishing or malware distribution campaign. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic specifically highlights the nature of these links as a link farm on disposable hosting, reinforcing the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://sunil.kr/uploadfile/fckeditor/file/85773380405.pdf In PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1612f6c11b5d05---rogevasesamerereviso.pdfIn PDF document text
    • https://faresaldabbous.com/uploads/file/puganumibonamanoko.pdfIn PDF document text
    • http://swatimishra.in/uploaded_files/userfiles/files/gozof.pdfIn PDF document text
    • http://pneusmarene.it/images/file/54362889297.pdfIn PDF document text
    • http://kaie.org/userfiles/file/20210915185420.pdfIn PDF document text
    • http://dezis.ru/uploads/files/bixopizeginesesamapu.pdfIn PDF document text
    • http://tydafa.com/dafa/uploadfiles/20210908184833.pdfIn PDF document text
    • http://fewo-spreewald-schoetzigk.de/brandenburgtag/img/editor/file/43138552816.pdfIn PDF document text
    • https://ssmavidiyar.com/public/content-images/files/vamudoxovimibogatedak.pdfIn PDF document text
    • http://abwlargo.com/uploads/files/sabevixekotop.pdfIn PDF document text
    • http://ghalemdi.com/userfiles/file/paduf.pdfIn PDF document text
    • http://collectifff.be/imgdb/accueil/files/nixuwetinefimiwibume.pdfIn PDF document text
    • http://starwindows.ie/ckfinder/userfiles/files/majewizoxezosozuloxit.pdfIn PDF document text
    • http://lauraestetica.com/userfiles/files/tegetogix.pdfIn PDF document text
    • http://szpitalstrzelin.pl/userfiles/files/bunuxobikosolazemela.pdfIn PDF document text
    • https://sanruouvang.net/images/uploaded/file/zijolojizukipuf.pdfIn PDF document text
    • https://franciscovalles.comtraining.cl/userfiles/files/pomit.pdfIn PDF document text
    • https://agregadoschucuri.sinecsas.com/ckfinder/userfiles/files/18776710522.pdfIn PDF document text
    • https://pustelnik-budownictwo.pl/ckfinder/userfiles/files/99756122528.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=roblox+home+pagePDF link annotation
    • http://tes-sys.com/uploads/ckfinder/files/20210914/16315501756893.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_off0000da0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA0C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f21e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF21E 17664 bytes
SHA-256: 74f34023b02838921af0e66db7fae3daedd8f43d20b80f5a018aebdd2498d50c
font_02_sfnt_off00012005.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12005 10424 bytes
SHA-256: 0ad2909d76f96d08a5d7ccee8ffffa0e17c2cdcb1868fd31da40a1f1b2fa0e99

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