Malicious PDF — malware analysis report

Static analysis result for SHA-256 1eae8a032578de47…

MALICIOUS

PDF

103.7 KB Created: 2021-10-16 12:57:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 9b6cf20b14e5d87b25c999ab47147786 SHA-1: 073d2463a6e18fd0ffd2d7c438e376ce58b39854 SHA-256: 1eae8a032578de475111f6bd264e89a4296b99163cf16dd96c346e794a86fe37
154 Risk Score

Malware Insights

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

The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates the document is a link farm hosted on disposable domains, suggesting a phishing or scam attempt. The ML classifier and ClamAV detection strongly support a malicious classification. The presence of numerous unknown URLs further reinforces the likelihood of a malicious download or redirection scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9919

Heuristics 7

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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 http://gniortho.com/files/Upload/file/ramisoletakexudesuleg.pdf In PDF document text
    • http://dgjinhak.kr/DATA/upload/files/202109131102048054.pdfIn PDF document text
    • http://bright-mineral.com/uploadfile/file/2021092609575739.pdfIn PDF document text
    • http://jbdclothiers.net/emailer/userfiles/file/jagofazuginasi.pdfIn PDF document text
    • http://sporteambiente.it/ckfinder/userfiles/files/xegivisajesowixunebur.pdfIn PDF document text
    • https://trungtammatnamviet.vn/upload/files/latonel.pdfIn PDF document text
    • http://labradory.pl/file/26882540619.pdfIn PDF document text
    • https://diarch.in/WYSIWYGImage/file/29789964678.pdfIn PDF document text
    • http://knowleangling.co.uk/ckfinder/userfiles/files/pepuvij.pdfIn PDF document text
    • http://asu78.ru/userfiles/file/71140372112.pdfIn PDF document text
    • http://saigonradio.com/userfiles/file/81057704964.pdfIn PDF document text
    • http://iehyun.com/editorupload/file/bomujigezokaro.pdfIn PDF document text
    • https://www.luthier-auxerre.fr/ckfinder/userfiles/files/16737522903.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fa09771315---telegotorezam.pdfIn PDF document text
    • http://xn--80adic7alej3d.xn--p1ai/userfiles/file/39546983515.pdfIn PDF document text
    • https://moyaexpresss.com/ckfinder/userfiles/files/wurulexekokegof.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615e680b4ab3d---vavegumosarali.pdfIn PDF document text
    • http://thuonghieutoancau.vn/uploads/files/koniruluxivipofogeg.pdfIn PDF document text
    • http://equipociclistaugeraga.com/ciclistas/userfiles/file/43324779973.pdfIn PDF document text
    • http://thegioituigiay.net/uploads/files/38616291041.pdfIn PDF document text
    • https://almuhja.net/ckfinder/userfiles/files/jipakubexozevosawikoli.pdfIn PDF document text
    • http://studiosiciliani.eu/userfiles/files/tudab.pdfIn PDF document text
    • http://vesimport.ru/userfiles/file/87502032867.pdfIn PDF document text
    • http://ottuk-e.org/userData/board/file/gigirujunotozonikoladag.pdfIn PDF document text
    • https://doucetplasticsurgery.com/ckfinder/userfiles/files/95470484155.pdfIn PDF document text
    • http://feedproxy.google.com/~r/Xvkpad/~3/HKUGBsJGI0E/uplcv?utm_term=piano+competitions+for+youthPDF 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_off000128ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128BA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000140cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x140CC 21524 bytes
SHA-256: 788e877e92320d1ddbabb68ebf2f25f1887fa494eb1e89e4090eccaa2de14043
font_02_sfnt_off00017849.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17849 10916 bytes
SHA-256: d8a4f41ecb834bc93e3d6b729ae15e3ede9126ee9b2178b09be73d4056ae2073

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