Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b1a00a9ed0ab4bd…

MALICIOUS

PDF

73.9 KB Created: 2021-09-23 12:01:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: ee078ba704df6f1a7e5f54ded1537a87 SHA-1: 1b7f9089123cd01f57c0bdc9ff6c6864a5890f56 SHA-256: 4b1a00a9ed0ab4bd8974a707820248e24f8b482fa9c43398fd5bd727e7cb7d11
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The presence of numerous embedded URLs, many pointing to suspicious domains and structured as a link farm, suggests a phishing or malware distribution attempt. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the overall structure and heuristic firings strongly indicate it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

Heuristics 5

  • 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.
  • 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://nhasachthunam.com/upload/files/wotexisedap.pdf In PDF document text
    • http://thaiboxes.com/piceditor/file/ketiromilemuduxolusugekus.pdfIn PDF document text
    • http://ingmarcofaedi.com/userfiles/files/71069604484.pdfIn PDF document text
    • http://infunplastic.com/d/files/14024655240.pdfIn PDF document text
    • http://www.plain-pied.com/editeur/ckfinder/userfiles/files/tejariwumobokup.pdfIn PDF document text
    • http://fleshlight-tw.com/userfiles/file/36040089592.pdfIn PDF document text
    • http://radiosalsa.fr/php/rs/filesupload/file/19881792808.pdfIn PDF document text
    • https://szaniterplaza.hu/ckfinder/userfiles/files/2989099258.pdfIn PDF document text
    • http://cuacuonductudong.com/upload/files/mubudurek.pdfIn PDF document text
    • http://realfootball.gr/userfiles/file/93480927263.pdfIn PDF document text
    • http://chongros.com/userData/board/file/zejitawabafo.pdfIn PDF document text
    • http://kielcenoca.pl/files/file/21281607748.pdfIn PDF document text
    • https://lexconsulting.ro/webroot/files/media/60840904619.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bda47c120c---71313753843.pdfIn PDF document text
    • http://nage-z.com/ckfinder/userfiles/files/tarug.pdfIn PDF document text
    • http://devison-matras.ru/upload/file/befutipez.pdfIn PDF document text
    • http://wamer.org/userfiles/file/25415521317.pdfIn PDF document text
    • https://bank-kredit.at/ckfinder/userfiles/files/31644475417.pdfIn PDF document text
    • https://dhins.com/testingsites/advantage_aviation/assets/media/file/binoxejamopisi.pdfIn PDF document text
    • http://deauville.ru/files/file/49791443071.pdfIn PDF document text
    • http://www.jobibon.com/admin/userfiles/file/64801453274.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=real+car+parking+hack+apk+downloadPDF link annotation
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142d25c2e6a1---xabijajilezekelog.pdfIn PDF document text
    • 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_off0000bdd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBDD1 16988 bytes
SHA-256: 873d9484b09d9c9051ffc461944814a068ecbea864332b4f5dad2aaebc548075
font_01_sfnt_off0000e99d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE99D 10748 bytes
SHA-256: 5b539349992d59890f7c502f71519db671720c5b63fd350a8c36ad7fe11726d3
font_02_sfnt_off0001020b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1020B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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