Malicious PDF — malware analysis report

Static analysis result for SHA-256 819670e79e1b03c9…

MALICIOUS

PDF

72.0 KB Created: 2021-09-11 22:54:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 45d198c69f248aacb224faea3e1a9e66 SHA-1: 87fea56d1d5e19cfc1d460099197d865185db14e SHA-256: 819670e79e1b03c944ff6f18c14275897108b79bcf0cfc8d72658a0595cf84e4
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically identified as a phishing trojan. The heuristic analysis indicates the PDF acts as a link farm, containing numerous links to disposable hosting, with a high concentration of links per host. This suggests a deliberate attempt to obscure the final malicious destination, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://tichdiem.surecare.vn/uploads/userfiles/file/87616004320.pdf In PDF document text
    • http://lagrupacio.cat/file/powom.pdfIn PDF document text
    • https://nsck-cykelmotion.dk/ckfinder/userfiles/files/kafapopenapabe.pdfIn PDF document text
    • http://barudan.hk/UploadFile/file/20210902141808296.pdfIn PDF document text
    • http://pho32shabu.com/uploads/files/55060995346.pdfIn PDF document text
    • http://casaatlantida.com/userfiles/file///95963117224.pdfIn PDF document text
    • http://itps-group.com/uploadfiles/file/dajarezibulefepowuladudip.pdfIn PDF document text
    • http://aurastaffing.es/upload/file/32259323993.pdfIn PDF document text
    • https://carparts-fixture.com/file/file/62799266765.pdfIn PDF document text
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1612f85200be56---rurijafa.pdfIn PDF document text
    • http://warehousetraining.ie/images/busenetedema.pdfIn PDF document text
    • http://luxcottage.ru/stroykamen/userfiles/files/2057226663.pdfIn PDF document text
    • https://khachsan295doson.vn/namthuan/images/news/files/banatodibadena.pdfIn PDF document text
    • https://crownprolaw.com/userfiles/Proj_Name/files/lufolojefojixidifoxenog.pdfIn PDF document text
    • http://anonelectronics.com/admin/fckeditor/editor/filemanager/connectors/php/upload_jpg/file/202109060312117047.pdfIn PDF document text
    • http://jawarakreasi.com/file/26385315897.pdfIn PDF document text
    • http://ingmontagna.com/userfiles/files/62686283254.pdfIn PDF document text
    • http://nousgarage.com/userfiles/file/difatakugom.pdfIn PDF document text
    • http://bartuceviri.com/userfiles/file/dinilapeno.pdfIn PDF document text
    • https://tch.lu/files/files/55322653817.pdfIn PDF document text
    • http://merlegdoktor.hu/tmp/miparobotenelebarunedonab.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/dbc04ff3aab23fa12da34b5521705839/30388981588.pdfIn PDF document text
    • http://ancient-theater.gr/media/file/xivodizasimiposekugibexax.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=words+that+start+with+at+and+end+with+atPDF 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_off0000b9ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB9BA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d1cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1CC 16100 bytes
SHA-256: acc643844a480c1befd6822866655aef0db2262b47dac9d1e4204a1ddd66c917
font_02_sfnt_off0000fac9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAC9 10380 bytes
SHA-256: 10bb2469aea51c99353ef6929721343332d0c5cabde55d5ea93de8ad858516e1

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