Malicious PDF — malware analysis report

Static analysis result for SHA-256 071d7ae1e22378b3…

MALICIOUS

PDF

75.7 KB Created: 2021-09-23 02:53:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 18c6f3dd95107dea3703613bf1178f13 SHA-1: d8e890f43f2a992bb7b004d3eee48aacd227fa30 SHA-256: 071d7ae1e22378b3ed0468ac90bda4eea86ab38629cfd7cdb62f5ca011c9e3e4
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document contains numerous links to potentially disposable hosting sites, suggesting a phishing or malware distribution lure. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristics point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://underbutter.cz/download/foto/23203734749.pdf In PDF document text
    • https://waxparadise.pl/userfiles/file/buriwiwijagibixogi.pdfIn PDF document text
    • http://salwex.hu/file/papusunofowakikofu.pdfIn PDF document text
    • http://naplesredeals.com/userfiles/files/3521105276.pdfIn PDF document text
    • http://kristiankutschera.de/userfiles/file/7728203405.pdfIn PDF document text
    • http://dataction.org/demo/dataction/media/21315645052.pdfIn PDF document text
    • http://worldtrip-eng.total-flame.com/application/views/blog/userfiles/file/36367332992.pdfIn PDF document text
    • http://opuspoint.com/ckfinder/userfiles/files/32290667087.pdfIn PDF document text
    • http://gizmakina.com/depo/sayfaresim/file/meloj.pdfIn PDF document text
    • http://craft-personal.de/userfiles/file/9840078259.pdfIn PDF document text
    • https://www.cascatai.com.br/ckfinder/userfiles/files/36474080229.pdfIn PDF document text
    • http://farmina.ru/uploads/files/61022087000.pdfIn PDF document text
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/8fab343857fa8c0ba5edf5f15cefa8f1/xovekimipit.pdfIn PDF document text
    • http://h-n-s.net/userfiles/file/99032172604.pdfIn PDF document text
    • https://www.hkfew.org.hk/ckfinder/userfiles/files/marowuvasejopojonig.pdfIn PDF document text
    • http://nscenter.cn/upload/files/58489992907.pdfIn PDF document text
    • https://nepalihemp.com/ckfinder/userfiles/files/kimapirifadunewodasegesax.pdfIn PDF document text
    • http://www.zywawiara.pl/pliki/55138613196.pdfIn PDF document text
    • http://art-wonders.com/ckeditor/ckfinder/core/connector/php/uploads/files/togujazipu.pdfIn PDF document text
    • http://gamboeng.com/assets/ckfinder/userfiles/files/12713384948.pdfIn PDF document text
    • http://vizit-k.net/uploads/editor/files/41988725724.pdfIn PDF document text
    • http://eros-arena.name/eros/userfiles/file/90388014994.pdfIn PDF document text
    • http://bancodevida.com/bancodevida/admin/images/image/file/68275383108.pdfIn PDF document text
    • https://ubk-sad.de/azubi/userfiles/files/pabipal.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=best+way+to+transfer+from+android+to+androidPDF 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_off0000c3f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3F6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dc08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC08 17188 bytes
SHA-256: 5ddd8d4e55d9fe22f849c714702bd7bfcf53c65fd4d10c4e6c65ca2a80dc959d
font_02_sfnt_off00010803.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10803 10724 bytes
SHA-256: 00df9771a42340aa3b33fb53ba4e456d1883c70554f4afacbbe817969a9cb144