Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7aeeef778343cd7…

MALICIOUS

PDF

79.1 KB Created: 2021-09-21 02:46:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 93618d63f1ad6640597aacf6ced656e8 SHA-1: 04fd905272d5617eb8dfd263830c1f83da1a8865 SHA-256: a7aeeef778343cd72bf1ee4a4f4b896ffbc6c6fbbef98965a4eca4e9b1e13c84
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file is identified as a malicious PDF by ML classifiers and ClamAV, indicating it's designed for phishing or malware distribution. It contains numerous embedded URLs, with one heuristic specifically flagging it as a link farm on disposable hosting, suggesting a lure to external malicious sites. The PDF's structure and the presence of external URIs point towards an attempt to redirect the user to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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 http://fygl.net/uploads/file/101953379662.pdf In PDF document text
    • https://morganmethod.com/ci/userfiles/files/wowekotod.pdfIn PDF document text
    • https://tablouri.emilianchirila.ro/imagini/files/26228896999.pdfIn PDF document text
    • http://flexinform.com/hirlevel/file/zawesilobizomafugegotoxi.pdfIn PDF document text
    • http://drsrkbedcollege.com/ckeditor/ckfinder/userfiles/files/48779114794.pdfIn PDF document text
    • https://tele-video.ru/upload/files/31876784548.pdfIn PDF document text
    • http://domplus.su/userfiles/files/33259210698.pdfIn PDF document text
    • https://repairbase.net/FCKeditor/editor/filemanager/connectors/php/images/file/43861981137.pdfIn PDF document text
    • http://rbc-bezorgdiensten.nl/upload/58654859512.pdfIn PDF document text
    • https://avphunter.ro/ckfinder/userfiles/files/koganuneloraveriguw.pdfIn PDF document text
    • https://tjp2-hotlink-j3t.com/contents/files/49938789124.pdfIn PDF document text
    • http://punaide.com/userfiles/files/sawidud.pdfIn PDF document text
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132488e3def6---84344581519.pdfIn PDF document text
    • https://pratham.one/file/32706099223.pdfIn PDF document text
    • http://kubablimel.pl/Image/files/75496849727.pdfIn PDF document text
    • https://funcarele.com/ckfinder/userfiles/files/1716932989.pdfIn PDF document text
    • https://infosantiere.ro/userfiles/file/97096073074.pdfIn PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161490d1f1ce94---48265902883.pdfIn PDF document text
    • https://digitaldaya.com/imagenes/file/vavimoso.pdfIn PDF document text
    • http://alemotta.com/resources/original/file/29000936251.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=pdf+to+jpg+unlockPDF 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_off0000d2cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2CF 17224 bytes
SHA-256: 430531e6f95806daaf66795a21a1feff38fcf38de6d0488ed2deb0b3657e4d3d
font_01_sfnt_off0000ff5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF5E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011775.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11775 10464 bytes
SHA-256: 6b383715b4be37c17a3b47091006d38596c3f26769274a013c091c4fd07997ca

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