Malicious PDF — malware analysis report

Static analysis result for SHA-256 eec67d897622a24f…

MALICIOUS

PDF

86.7 KB Created: 2021-10-16 11:26:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 96f053493b52d5c40ac673cf57552c7c SHA-1: ded3d1caced4011f86a6d31c4f0911f452c37c79 SHA-256: eec67d897622a24f0826988ea561fb4a9fa1314ad9b6d52dc50706903e09747a
126 Risk Score

Malware Insights

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

The sample was detected as a malicious PDF by ClamAV and an ML classifier. It contains numerous embedded URLs, many pointing to disposable domains, and exhibits characteristics of a link farm. While no scripts were explicitly extracted, the PDF structure and heuristic firings suggest it is designed to redirect users to potentially malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://vinasimex.com/uploads/file/pewagixogakoxefix.pdf In PDF document text
    • http://maturitni-ples.eu/UserFiles/File/22436706233.pdfIn PDF document text
    • http://www.tsahimmongol.com/uploads/images/files/pemekaxufis.pdfIn PDF document text
    • http://kubak-ubezpieczenia.pl/userfiles/file/937620072.pdfIn PDF document text
    • http://librojuridico.com/aym_images/files/32976665661.pdfIn PDF document text
    • https://krishnacock.com/userfiles/file/fidexamavosuwujuwajepawu.pdfIn PDF document text
    • http://tattooindex.nl/images/uploads/10916317470.pdfIn PDF document text
    • http://host.keraladreamhomes.com/~viswabrahmathach/admin/fckeditor/editor/filemanager/connectors/php/userfiles/file/minuropiborokijoj.pdfIn PDF document text
    • http://meditopthailand.com/file/nodafutu.pdfIn PDF document text
    • http://americansemitruckparts.com/d/files/bilafufo.pdfIn PDF document text
    • https://bankubezpieczen.pl/userfiles/file/sajidapizekaguluna.pdfIn PDF document text
    • http://misterholidaysanprisco.it/userfiles/files/52844657210.pdfIn PDF document text
    • https://wonwon.taipei/photo/file/40603724726.pdfIn PDF document text
    • http://seattledesis.com/fckeditor/file/33610615510.pdfIn PDF document text
    • http://rhondadejean.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/89790160632.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/16155eac0a123e---rebenisodisilagoga.pdfIn PDF document text
    • http://bora.su/ckfinder/userfiles/files/xujuromiwe.pdfIn PDF document text
    • http://tbeaindia.com/userfiles/file/piseraruwisapolo.pdfIn PDF document text
    • https://lolakarimova.uz/ckfinder/userfiles/files/6314762006.pdfIn PDF document text
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/6qjim15m08fm8275hsce3t7m84/28064848444.pdfIn PDF document text
    • https://mkontroll.hu/File/romufoba.pdfIn PDF document text
    • http://feedproxy.google.com/~r/Xvkpad/~3/23D8k0Ec_6w/uplcv?utm_term=what+is+a+metaphor+examplePDF 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_off0000ecbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECBE 19328 bytes
SHA-256: e5f2b032c6c276c0360e3072a03f1005c3fa8bb5284b51a21d26b417b92665db
font_01_sfnt_off00011d68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D68 10508 bytes
SHA-256: 8f0746288247729e9df5c85290bc027e62cff292c14a37f4fd18353cd2e0874c
font_02_sfnt_off00013559.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13559 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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