Malicious PDF — malware analysis report

Static analysis result for SHA-256 09d360851879c209…

MALICIOUS

PDF

83.0 KB Created: 2021-09-15 16:07:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: d152803215c932a36a0d2eb1d1568907 SHA-1: 1770209f642fca41576d7e81035f6cb24e48d4c2 SHA-256: 09d360851879c20956314aa94d1dffaa3120aa5525cda8a1f768ec4c2c9e0f05
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected by ClamAV as 'Pdf.Phishing.Trojan' and flagged by an ML classifier with high confidence. It contains numerous embedded URLs, many of which point to disposable domains and are structured as link farms, indicating a phishing or redirection attempt. The PDF structure itself is also flagged for being a link farm on disposable hosting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://amghanoi.com/images/ckeditor/files/midolopewuniwupe.pdf In PDF document text
    • http://k1a.ru/images/files/file/41457348336.pdfIn PDF document text
    • http://ryyw.com/upload/files/2021/09/202109031330304049.pdfIn PDF document text
    • http://tutek.eu/userfiles/file/78932700258.pdfIn PDF document text
    • https://zahrek.com/userfiles/file/kuvasavalulorizijiwaxux.pdfIn PDF document text
    • http://www.tobywells.org/media/fckdir/file/25540767658.pdfIn PDF document text
    • http://agriturismolionsfarm.it/userfiles/files/sobefevo.pdfIn PDF document text
    • http://piotrkowska77.pl/zdjeciafile/22487955239.pdfIn PDF document text
    • https://avukatwebsitesi.trakyasoft.com/upload/files/90117354395.pdfIn PDF document text
    • https://www.iieng.org/editor/ckfinder/userfiles/files/kuzibanofokarozorozoxowig.pdfIn PDF document text
    • http://lightofislamonair.org/uploads/files/voraseki.pdfIn PDF document text
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/0ca9b990e36404e3f4de46b78f9d98ec/wutesutemimolaj.pdfIn PDF document text
    • http://elpijisystem.com/file/78288245366.pdfIn PDF document text
    • http://azinsaghf.com/cache/fck_files/file/vaterepusudosijomebiwox.pdfIn PDF document text
    • http://lakesnwoodskerala.com/uploads/file/bokipe.pdfIn PDF document text
    • http://skrabl.pl/www/rpbd/fck/file/84836917522.pdfIn PDF document text
    • https://esvigo.com/upload/files/vitakigikezeselumofam.pdfIn PDF document text
    • http://hoteldanang.vn/uploads/images/files/98959493954.pdfIn PDF document text
    • http://fkjz.cn/upload/files/2021/09/202109082121344366.pdfIn PDF document text
    • http://chemonova.com/FCKeditor/file/17310041257.pdfIn PDF document text
    • http://djpress.pl/Image/files/16966496966.pdfIn PDF document text
    • https://www.studiorosaliabusco.it/ckfinder/userfiles/files/gebujet.pdfIn PDF document text
    • https://sharedsynergy.com/userfiles/file/64931613445.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=what+is+power+saving+mode+on+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_off0000df8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF8B 17772 bytes
SHA-256: 2e83bc4e1107b10826c7487493e86c867722a0d35804ad0269e4ea8311b664d4
font_01_sfnt_off00010d12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D12 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012529.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12529 10940 bytes
SHA-256: 47f33f30493b4f97c1da6ca14adb8ef41a4867e9f7eb5fb9f39d103338e6c5cd

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