Malicious PDF — malware analysis report

Static analysis result for SHA-256 ecc71b0d032ad252…

MALICIOUS

PDF

88.9 KB Created: 2021-09-13 15:53:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 83847f3a389dcdaf2e06621a1c81b88c SHA-1: 9a23944bd994d14d04c9cbf433062bebfcdf4de7 SHA-256: ecc71b0d032ad2521e812b52ac18584a159ee145dfe7590239d42d41a29f04f3
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by a machine learning classifier and ClamAV as malicious, indicating a phishing or trojan payload. The PDF contains numerous embedded URLs, many of which point to disposable domains, suggesting a link farm designed to redirect users to malicious sites. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating the PDF's purpose is to host a collection of links to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

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 https://sofupingame.com/calisma2/files/uploads/gigamizujisuxov.pdf In PDF document text
    • http://jingluo.net/uploadfiles/files/99463526732.pdfIn PDF document text
    • http://orbitsecurity.qa/pro_mvp_tech/uploads/file/1215743049.pdfIn PDF document text
    • https://net-mex.hu/ckfinder/userfiles/files/naxosebekonaruzenami.pdfIn PDF document text
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/14618109961e8c7abbc1b1bd007f9d31/fikeviwemefumirobuvajoj.pdfIn PDF document text
    • http://motolargo.pl/userfiles/file/68997071101.pdfIn PDF document text
    • https://grupo-bahia-real-estate.com/ckfinder/userfiles/files/12032617924.pdfIn PDF document text
    • https://buka.ru/sadm_files/43058263408.pdfIn PDF document text
    • http://ueros.fr/admin/ckfinder/userfiles/files/238206695.pdfIn PDF document text
    • http://chapraptti.org/userfiles/file/jojumorexe.pdfIn PDF document text
    • http://worshipedia.mobi/sites/default/files/file/rasusewuvebodida.pdfIn PDF document text
    • https://lexcochoralsoc.org/demo/lccs/beta/userfiles/files/57702629601.pdfIn PDF document text
    • http://naso10.com/userData/board/file/67524271555.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f3ee23c62d---32152286962.pdfIn PDF document text
    • http://reklama-kemerovo.ru/files/files/lowamapare.pdfIn PDF document text
    • http://tnslib.su/userfiles/files/90647593929.pdfIn PDF document text
    • http://proxima-design.cz/files/file/41463792610.pdfIn PDF document text
    • http://full814.com/upload/files/75925288667.pdfIn PDF document text
    • http://floramarble.com/uploads/36418382328.pdfIn PDF document text
    • https://biharlokmanch.org/userfiles/file/lotowamerewevuzino.pdfIn PDF document text
    • http://ipmarketing.net/FCKeditor/editor/filemanager/connectors/userfiles/file/93383288640.pdfIn PDF document text
    • https://apc-algercentre.dz/ckfinder/userfiles/files/86443956474.pdfIn PDF document text
    • http://15449010.com/FileData/ckfinder/files/20210902_4E03B8732CE66CA6.pdfIn PDF document text
    • https://keralatemples.info/ckfinder/userfiles/files/1953701961.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=o365+incoming+mail+serverPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d505.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD505 16128 bytes
SHA-256: e086d997b6ee3c3fe48f8fdf49e8854b9e9bef9c53b5c2c5f26bba4f2b277426
font_01_sfnt_off0000ea5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA5F 22604 bytes
SHA-256: da21a0f6cc96f3249f9e7899c456cef0b3dedc49d9dee73ff1055cc71cae7a5b
font_02_sfnt_off000123f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123F5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00013c0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C0C 11040 bytes
SHA-256: 0b66f7f8ecccae2e702a16b3ebbc47c9184861ba72c975b9fb8ba5f4c081832b