Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf358b31b9a31d90…

MALICIOUS

PDF

84.7 KB Created: 2021-09-19 06:58:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 2d6b8fa7713050cab5ffa78ecb5a1414 SHA-1: a964789b1969a46a188b96318695541e06a1a9a2 SHA-256: cf358b31b9a31d9016eafce59e1115c98f23a8e28d4de00213f46e82d15e3650
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many pointing to disposable domains, and is flagged as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or distributing further malware. No scripts were extracted, so the primary attack vector appears to be social engineering via the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/16141392188edc---perewobijid.pdf In PDF document text
    • http://rorolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/42859980179.pdfIn PDF document text
    • http://globomax.eu/userfiles/file/bovidiwefavomigibajapepu.pdfIn PDF document text
    • http://kartywspomnien.pl/uploads/assets/file/dugamum.pdfIn PDF document text
    • http://lactopad.com/uploads/files/fujuvomezoguwoxofej.pdfIn PDF document text
    • https://icrs-as.com/userfiles/file/robebipekexidininutigo.pdfIn PDF document text
    • https://zahidnawaz.com/UploadedImages/image/19436688846.pdfIn PDF document text
    • https://westhygiene.hu/editor_up/potizugotorabop.pdfIn PDF document text
    • http://henzefashion.com/userfiles/file/18297231808.pdfIn PDF document text
    • http://pyramidplaster.com/file_media/file_image/file/70625028046.pdfIn PDF document text
    • https://tedesco.pl/userfiles/file/46610500901.pdfIn PDF document text
    • http://dreiseengrundschule.de/files/puzozisaxegezif.pdfIn PDF document text
    • http://montpellier-businessplan.eu/mbp/upload/images/images/upload/ckfinder/45736745822.pdfIn PDF document text
    • http://duda-tech.pl/dudatech/upload/file/zebemituvumilopudixulalu.pdfIn PDF document text
    • https://firesystem.ro/imagini_ws/20252936170.pdfIn PDF document text
    • http://cobe-ing.it/userfiles/files/9498266796.pdfIn PDF document text
    • http://arcstema.com/userfiles/files/ragiwerekikiriluvewosum.pdfIn PDF document text
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/t4tvmlm165svq0trh8e8dqj861/15307067426.pdfIn PDF document text
    • http://istihdamhaberleri.com/upload/ckfinder/files/fegafixepoperotuwatoj.pdfIn PDF document text
    • http://www.jokilaaksonratsastajat.fi/file/91607000656.pdfIn PDF document text
    • http://schule.havonix.com/ckfinder/userfiles/files/23548551406.pdfIn PDF document text
    • http://zamdq.com/filespath/files/20210908045035.pdfIn PDF document text
    • http://serviphony.com/tinymce/jscripts/tiny_mce/plugins/phpimage/phpimage/upload/images/file/xorasosevetawujefalamel.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=google+print+androidPDF 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_off0000e79d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE79D 17896 bytes
SHA-256: 7df946a6357ff88ab945eeba3bc9ef29be381253ff562f54bc7f8ffb620d1688
font_01_sfnt_off00011633.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11633 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012e4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E4A 10440 bytes
SHA-256: c890f57bf1a25e043bad8a64ec21227b27b85590070cd25bcc31fd8d29549c65