Malicious PDF — malware analysis report

Static analysis result for SHA-256 17b4f9678d8528be…

MALICIOUS

PDF

61.2 KB Created: 2021-09-27 01:35:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1aa19035a7fc0cce914e8dee99ac0b1e SHA-1: e0afaf1f72a193ea82f16e39c33256c0990f32c2 SHA-256: 17b4f9678d8528beab0549785c80d04c8648a997210182ed5718627cb35129b9
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and is flagged as a link farm on disposable hosting, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier further support its malicious nature. Although no scripts were explicitly extracted, the presence of embedded URLs and the overall structure suggest it's designed to redirect users to malicious sites, likely as part of a spearphishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5428

Heuristics 4

  • 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
  • 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://smidgel.ru/uplcv?utm_term=how+many+layout+in+android
    • https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/fb732f7a960c925e507406958565bac0/vaxijizef.pdf
    • http://blpest.com/UserFiles/file/tasojabudiziju.pdf
    • http://meble-tk.pl/userfiles/file/saxofaxaparujubabi.pdf
    • https://eastmanllc.com/ckfinder/userfiles/files/wugozuzatopodu.pdf
    • https://christschoolblr.in/userfiles/file/piwejuwepi.pdf
    • http://arkystudio.eu/userfiles/files/20813697089.pdf
    • https://avistravel.ro/userfiles/file/14139307260.pdf
    • https://pasarangroup2.com/contents/files/wimiwijonixe.pdf
    • https://dmshospital.com/mm_engg/files/nokarusisenade.pdf
    • http://www.rafaellucenaehijos.com/ckfinder/userfiles/files/22871265056.pdf
    • http://laibros.com/ckeditor/userfiles/files/83384575762.pdf
    • http://www.europesolidaire.eu/userfiles/files/majalavuvapimeveguwiraroz.pdf
    • http://budaors.varosom.hu/userfiles/files/vewezolatimoveditun.pdf
    • http://pk.mo/userfiles/file/dazokufomesiveje.pdf
    • http://aardbeienfeesten.nl/uploadimages/files/saximowafaruzisoremufogod.pdf
    • http://dvarenda.ru/upload/file/xuzimoxot.pdf
    • http://clairvoyantinfotech.com/demo/images/34613500135.pdf
    • http://studiozoppini.com/userfiles/files/vibimodisu.pdf
    • http://polipadel.com/userfiles/file/xanekoxakemiw.pdf
    • http://xingyeknitting.com/userfiles/files/zekevurefuneji.pdf
    • http://dylogistics.com/userData/board/file/44831968991.pdf
    • http://russia-ex.com/images/blog/file/30482926126.pdf
    • http://kechengchem.com/upload/files/lilurujokixifutatotedefe.pdf
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b15b.bin
ca9c5a45cdc6e806a43e300fd0af782bfd21a0b767e911f5a3c3d3824d4342fc
pdf-font-stream PDF embedded font (sfnt) at offset 0xB15B 16816 bytes
font_01_sfnt_off0000dcc7.bin
ba8453389333d8624e1c1e00629ab0a927ecf5e87c5a748fb8c0155bb27daf38
pdf-font-stream PDF embedded font (sfnt) at offset 0xDCC7 10400 bytes