Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c85a2c966fad82e…

MALICIOUS

PDF

83.4 KB Created: 2021-09-15 19:01:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 16bdff2b30c12dcb491f26abc5ae5c6d SHA-1: e889f2d3577dbea8855a89180f59f4968c74750d SHA-256: 0c85a2c966fad82eb4fadce5f905655b573d4a2b1343062c6e124dff505d7872
126 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, with one heuristic identifying it as a link farm on disposable hosting, suggesting an attempt to redirect users to malicious sites. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_URI heuristics indicates a strong likelihood of phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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://hillsclinic.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/75998696572.pdf In PDF document text
    • https://stmpallet.com/ckfinder/userfiles/files/wefobogipaja.pdfIn PDF document text
    • http://jowinbio.com/upload/files/202109152147505186.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/alnl642rqfgutpju3a1a04mu2d/gojibupuxatatojupab.pdfIn PDF document text
    • https://nakatarikaszel.pl/app/webroot/userfiles/file/19030482737.pdfIn PDF document text
    • https://www.htlexpress.com/ckfinder/userfiles/files/xilazaxemi.pdfIn PDF document text
    • http://vrzion.com/data/userfiles/files/kijarerudizedun.pdfIn PDF document text
    • http://csc021.com/userfiles/file/20210914171242_sb0z4g.pdfIn PDF document text
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/9261btptn42v2jhj038mjts906/pasalaziverimeze.pdfIn PDF document text
    • http://kaizenlife.com/ckfinder/userfiles/files/60704893836.pdfIn PDF document text
    • https://ichapps.com/ichapps/ckeditor-ckfinder-integration/uploads/files/39706493237.pdfIn PDF document text
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/22fb0a19fa39f6e14ef484714587add3/xibuweviwiti.pdfIn PDF document text
    • http://benrassam.com/uploads/files/80738540409.pdfIn PDF document text
    • http://coolscape.info/images/files/51368834623.pdfIn PDF document text
    • https://fullmagicweekend.com/ckfinder/userfiles/files/52270075764.pdfIn PDF document text
    • https://thaiahpa.com/flash/files/64380543834.pdfIn PDF document text
    • http://espicycooking.com/files/file///kebitogug.pdfIn PDF document text
    • https://milorem-service.ru/userfiles/file/55471902819.pdfIn PDF document text
    • http://harposwebdesign.nl/app/webroot/files/userfiles/files/46632709426.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/purokakugedilexe.pdfIn PDF document text
    • https://securitydm.rs/slicice/file/65578860283.pdfIn PDF document text
    • http://anipetkingdom.com/webroot/img/files/lujadabaxiwedo.pdfIn PDF document text
    • https://mgs-on-track.com/uploads/misc/files/desisevuvapejojotuzi.pdfIn PDF document text
    • http://xn--ob0bjxt9h99icicrvkksa421cwwp7hiv4d6a.com/ckfinder/userfiles/files/mezegotududuvikunamavi.pdfIn PDF document text
    • http://stuarteisbrucklaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/wofesololido.pdfIn PDF document text
    • http://czpohledavky.cz/userfiles/files/vaporowunipibuw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=how+to+clear+all+app+cache+in+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_off0000e300.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE300 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fb17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB17 10520 bytes
SHA-256: 34e3b73a41dec9e840afd83cf15b3326375e1cdfe2d1f0d090d661de95384065
font_02_sfnt_off000112f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112F2 17472 bytes
SHA-256: de4274f6e12df242d32c46a08a11c41a6b21b01717cf017c6c1a327d87e45718