Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d22e6521a21d6db…

MALICIOUS

PDF

73.1 KB Created: 2021-10-10 01:20:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 72bc401b17d2a690adbc9f58d3aa3fb2 SHA-1: ac6f2624aba7e7c38e40a27beccc28d12f483310 SHA-256: 8d22e6521a21d6db532747f90fa0cb64ebb9d9e3f6160c21ebc910437e74df9f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links pointing to various domains, many of which are identified as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. While no scripts were directly extracted, the structure and heuristic firings suggest the PDF is designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://onlinendttraining.com/files/95836352026.pdf In PDF document text
    • https://btsis.com/upload/ckfinder/files/60856454562.pdfIn PDF document text
    • http://maskaevlawyer.ru/userfiles/file/diwukibalumepikuxavat.pdfIn PDF document text
    • http://cn-biyoute.com/d/files/soxogiravemuwarutijedes.pdfIn PDF document text
    • http://www.kroonzuivel.nl/ckfinder/userfiles/files/daxagetumumevomulolewata.pdfIn PDF document text
    • http://videlec.be/ressource/file/44092356361.pdfIn PDF document text
    • http://wjvanderheidedienstverlening.nl/uploads/file/bijuwujagexegu.pdfIn PDF document text
    • http://thepokeluau.com/uploads/files/pawilemov.pdfIn PDF document text
    • https://aprilboya.com/userfiles/file/61418696327.pdfIn PDF document text
    • http://michelesherrinlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/65477104662.pdfIn PDF document text
    • https://noihoithanhtuan.com/media/ftp/file/dokovujetefoninogewojidod.pdfIn PDF document text
    • https://best-label.com/upload/files/xuzalowekafiletewapija.pdfIn PDF document text
    • https://ajambary.com/userfiles/file/zanofoxarufuruw.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615b39e159438---gabisowevusem.pdfIn PDF document text
    • http://franklcalabreseattorney.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/zinoka.pdfIn PDF document text
    • https://www.hs-hofgastein.salzburg.at/ckfinder/userfiles/files/44692008783.pdfIn PDF document text
    • http://votejoedestefano.com/editorData/file/dimuwidol.pdfIn PDF document text
    • http://areaengineeringsrl.eu/userfiles/files/musibedefemovefusetodeb.pdfIn PDF document text
    • http://balogmihaly.hu/UserFiles/file/503788450.pdfIn PDF document text
    • https://hgqq.hk/tony/churchofgod/ckfinder/userfiles/files/8351335918.pdfIn PDF document text
    • http://hebammenglueck.de/ckfinder/userfiles/files/11071380507.pdfIn PDF document text
    • https://gppacdatabase.net/userfiles/file/53297350706.pdfIn PDF document text
    • http://vetportonaccio.it/userfiles/files/51841776549.pdfIn PDF document text
    • http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/hfndfcko6v9tdku2ks1b6oea3h/nabejibuza.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=path+of+exile+best+maps+to+farmPDF 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_off0000bb84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB84 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d39b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD39B 10760 bytes
SHA-256: e9315a02179e8ab1639c4bd2fe871501f0497e743a18c19cd7e8e80d6e8199f1
font_02_sfnt_off0000ec23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC23 17044 bytes
SHA-256: c446d12a89c82f7ea18ea1f0c300b92bda0adef92b626ae8309ee27574612800