Malicious PDF — malware analysis report

Static analysis result for SHA-256 3205cd5259618c29…

MALICIOUS

PDF

85.2 KB Created: 2021-09-15 20:16:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e2951e5ad8fcf95b5d22f805996c9b61 SHA-1: fa2c16aeddd1a4c14fc662270fbdf018e024b722 SHA-256: 3205cd5259618c299bace262814a0e221ed0346f6c9a073187987affff676df2
174 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of a 'Password-protected archive handoff' heuristic suggests the document is designed to trick users into downloading and decrypting a payload. While no scripts were explicitly extracted, the PDF structure and numerous embedded URLs point towards a phishing or credential harvesting attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://residenciasanamaro.es/userfiles/files/nifajiwexifu.pdf
    • https://jensbrode.de/files/file/99397722648.pdf
    • https://gaziemirkentkonseyi.com/upload/files/wixurumet.pdf
    • https://milorem-service.ru/userfiles/file/38267756747.pdf
    • https://mbzgogo.xyz/web/img/podborky/files/firunezenonaxivixeweluvi.pdf
    • http://malbreil.com/userfiles/file/madopukalobuwofer.pdf
    • https://plentis.eu/ckfinder/userfiles/files/binitujoperotiwiweni.pdf
    • https://narellesastro.com/userfiles/files/96961454365.pdf
    • http://fskyok.com/uploadfile/files/gujametufasiwuziruw.pdf
    • https://sgcaregiver.org/contents/files/butifonidukefig.pdf
    • http://runbo.net/upfiles/files/16308580862997.pdf
    • https://taichielite.com/louis/taichi/ckfinder/userfiles/files/61608201227.pdf
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16140e4ba5add8---jujulagudupekajomudem.pdf
    • https://successstudio.net/userfiles/file/lokamefebilumaxono.pdf
    • https://uangraja.com/contents/files/25039373238.pdf
    • http://yakutiaprime.ru/SITE/files/editor/file/26765795539.pdf
    • http://gavinlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/49250664956.pdf
    • https://suksesunited.com/contents/files/newuxemilik.pdf
    • https://rocksoliddesigns.biz/userfiles/file/fizumu.pdf
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fc1a8bbbfc---85087577162.pdf
    • https://defi128.com/userfiles/files/83739541803.pdf
    • http://form4concrete.ru/pics/cont/file/sozuvusu.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=how+to+recover+deleted+messages+in+fb+lite
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e5af.bin
e5d853f114a19c1ee512afbdf9ed3518e058b579aa1400651c44f8b01640990e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE5AF 11104 bytes
font_01_sfnt_off0000ff5e.bin
38b3884c128b184f8628ea3241d8393ddc990e29f80124948147f2c49aa0d809		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFF5E 18772 bytes
font_02_sfnt_off00012f45.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12F45 16792 bytes

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