Malicious PDF — malware analysis report

Static analysis result for SHA-256 5919a5ea6679a26e…

MALICIOUS

PDF

84.4 KB Created: 2021-09-13 21:04:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 8014d071e37eec27df8f23bb356c0246 SHA-1: 9d32aade8338b87d3050318ff5e3687ea8f6a9de SHA-256: 5919a5ea6679a26e0f0d08b66a7fbef28a12b1a6e650668d3cddf7c9682fdb8c
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating a phishing or trojan threat. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, a tool often used to create malicious PDFs. The presence of numerous external links, many pointing to potentially malicious domains, further supports the phishing or malware distribution intent. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136b82c7bf42---32207981806.pdf In PDF document text
    • http://cbgnfinance.com/userfiles/file/52441862392.pdfIn PDF document text
    • https://www.partyshuttlebus.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1612f8573ba9a9---polusivijuruguroragatiraj.pdfIn PDF document text
    • http://levne-pohary.cz/UserFiles/File/jigutotezomovekititaguxet.pdfIn PDF document text
    • http://stefanourso.com/public/userfiles/file/reluwimimuta.pdfIn PDF document text
    • http://xn--djr00fsyfv0o5qgy9u.com/filespath/files/20210904050647.pdfIn PDF document text
    • http://heydarbaba.org/resimler/files/kutunazosewepimezurapi.pdfIn PDF document text
    • http://saydersan.com/firma/files/89882115328.pdfIn PDF document text
    • http://taigesw.com/upload/files/74931225988.pdfIn PDF document text
    • http://wingprocess.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/difaf.pdfIn PDF document text
    • https://hoatuoi360.vn/uploads/files/seger.pdfIn PDF document text
    • http://ntep2008.com/UserFiles/File/22417715004.pdfIn PDF document text
    • https://suprizpin.com/calisma2/files/uploads/rofefowofosi.pdfIn PDF document text
    • https://sukhayurveda.in/userfiles/file/18608078279.pdfIn PDF document text
    • http://marcth.pl/media/fck/file/11803414219.pdfIn PDF document text
    • http://kindergartenhelden.at/upload/file/30232786667.pdfIn PDF document text
    • http://j1medical.com/uploaded/file/joruboko.pdfIn PDF document text
    • http://fusheng-vietnam.vn/admin/webroot/upload/image/files/55705866728.pdfIn PDF document text
    • https://malinaionescu.ro/userfiles/file/titozevajalivuxusuvog.pdfIn PDF document text
    • http://aircond.md/upload_fck/file/gosugenisafujigebamix.pdfIn PDF document text
    • https://bocrangsuthammy.vn/upload/files/6509481723.pdfIn PDF document text
    • http://x-site.by/upload/editor/files/bitovilikodiwobadupem.pdfIn PDF document text
    • https://ipekyolumedya.com/resim_galeri/file/bugiguvulajidederupogizu.pdfIn PDF document text
    • http://modulobase.com/userfiles/file/49245947600.pdfIn PDF document text
    • http://getdol.com/page_data/file/35085386637.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=best+android+jump+n+run+gamesPDF 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_off0000dfe0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFE0 19124 bytes
SHA-256: 3ffb4738de07963dfb748b6cd4208836f9cf013ed70adedb5dfe17060a07d7e0
font_01_sfnt_off00011243.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11243 10972 bytes
SHA-256: 40e4a0ec9b083114e4d13a845c0d082f8ce5d20af8cf14b8923b6ca9ab62148d
font_02_sfnt_off00012b80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B80 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1