Malicious PDF — malware analysis report

Static analysis result for SHA-256 a21bd6a54f6d829d…

MALICIOUS

PDF

70.2 KB Created: 2021-09-28 20:23:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 71ccb58b483aa77b7b292568d4dd9855 SHA-1: dea30c434a66a668d998c1b612bb6b49a72fed56 SHA-256: a21bd6a54f6d829d0ceea69900e1cfc421238a8c4a02add54b5bf911175c0872
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ML classifiers and ClamAV as malicious. It contains numerous embedded URLs, many of which point to link farms or disposable hosting, suggesting a phishing or malware distribution attempt. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a deliberate effort to create a large number of links on potentially untrusted domains, likely to obscure the true malicious destination or to appear as a legitimate content aggregator.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://harom.ro/files/file/mezadinojoliwamodozigiba.pdf In PDF document text
    • https://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/f78e78272cb6ac95c7576e1a7590a5d4/72720100844.pdfIn PDF document text
    • http://studioarchterreni.it/userfiles/files/xurolizonagobeguzejeze.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/1614bb8190c3bf---16352627610.pdfIn PDF document text
    • http://ntouioc.ntou.edu.tw/ckfinder/userfiles/files/72208114739.pdfIn PDF document text
    • https://newegys.egyseg.eu/ckfinder/userfiles/files/rivaxaxu.pdfIn PDF document text
    • http://ansing.nl/userfiles/file/94251113203.pdfIn PDF document text
    • https://triatlonshop.cz/userfiles/file/16744814501.pdfIn PDF document text
    • https://jin-ji.com/upload/files/wuwutetepam.pdfIn PDF document text
    • http://milwaukee.center/userfiles/file/5750936710.pdfIn PDF document text
    • http://bhttourist.com/upload/fckimagesfile/73000123336.pdfIn PDF document text
    • https://sabresources.com/FCKuploads/file/rokejatopidigaduxeda.pdfIn PDF document text
    • https://eksiliotomotiv.com/upload/ckfinder/files/54874183507.pdfIn PDF document text
    • http://gazetavk.ru/img/file/tepavakofukudukek.pdfIn PDF document text
    • http://acrclubinversores.com/files/galeria/files/43386586254.pdfIn PDF document text
    • https://italvaping.com/file/nimibo.pdfIn PDF document text
    • http://zygzak.eu/foto_dane/wysiwyg/File/kezezikit.pdfIn PDF document text
    • http://nickels.design/ckfinder/userfiles/files/winudijajopuronefezakofa.pdfIn PDF document text
    • https://duel.pl/userfiles/file/befim.pdfIn PDF document text
    • https://birotex.rs/images/files/83558944376.pdfIn PDF document text
    • http://coumert.com/images/file/97032605624.pdfIn PDF document text
    • http://xn--k1akb4c.xn--p1ai/userfiles/file/72952063914.pdfIn PDF document text
    • http://valdhans.cz/userfiles/file/72364900203.pdfIn PDF document text
    • https://apexsafetyproducts.com/ckfinder/userfiles/files/pewixinajozivokikokiroji.pdfIn PDF document text
    • http://lakesnwoodskerala.com/uploads/file/dasawotezol.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=free+v+bucks+fortnite+hackPDF 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_off0000b43a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB43A 15008 bytes
SHA-256: 2be29e214fa2b2643cd158e85e2f444c78a97645ccc56d6d5b162dbd14757b37
font_01_sfnt_off0000da09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA09 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f220.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF220 10764 bytes
SHA-256: c80a0a616cff6d4bde0fecbd84a66e710ef58a612c3fcc8dd2c67036858d9bad

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