Malicious PDF — malware analysis report

Static analysis result for SHA-256 518ec95ee700725c…

MALICIOUS

PDF

82.7 KB Created: 2021-09-17 20:50:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: cf5800e63ccbcf03a02a6c727dd32700 SHA-1: d3625e70c1ae590820be4781b628c14b65a01570 SHA-256: 518ec95ee700725c699c5ad892e15db6cc0e0202753dc8de639313d120a83d4b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous external URIs, many pointing to potentially disposable domains, suggesting a link farm or phishing lure. While no scripts were explicitly extracted, the PDF structure and heuristic firings strongly suggest it's designed to redirect users to malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://doxity.ro/ckfinder/userfiles/files/91526178992.pdf In PDF document text
    • http://uekekb.ru/!upload/files/piroxojevugosutudiko.pdfIn PDF document text
    • http://md-servicios.com/userfiles/file/98592611457.pdfIn PDF document text
    • https://okazdedziecko.pl/_files/Media/file/filidepupa.pdfIn PDF document text
    • http://bowenlawmt.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/55660231981.pdfIn PDF document text
    • http://mcenterdk.ru/fck_editor_files/files/26130556081.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614021e2e4d70---digisobobamubidesebu.pdfIn PDF document text
    • http://klasykarozrywki.pl/public/images/fck/file/59305313308.pdfIn PDF document text
    • https://aecvfcom.nrgence.com/upload/userfiles/files/23760817104.pdfIn PDF document text
    • https://iqmuseum.mn/uploads/files/49948769687.pdfIn PDF document text
    • http://vector-luczak.pl/new/fck_user_files/file/popuzaxozikivopulezebemo.pdfIn PDF document text
    • https://skykharchono.mn/editor/files/28952211582.pdfIn PDF document text
    • http://sangtaoad.com/uploads/userfiles/file/64895356625.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/2n2vntqtogma3e1ff5ltotue82/41625319511.pdfIn PDF document text
    • https://shopexpert.com/app/webroot/files/userfiles/files/xepoj.pdfIn PDF document text
    • http://titusauto.hu/kepek/file/jedimib.pdfIn PDF document text
    • http://jeanchapleau.com/userfiles/file/lixolifawimosexawoki.pdfIn PDF document text
    • http://jd6618.com/jd6618/file/2021-9/file/LwpCms2021_09_10_14_38_21_9608.pdfIn PDF document text
    • http://www.ap-arte.ro/fckupload/file/nukifopawufined.pdfIn PDF document text
    • https://stomatoloska-ordinacija-rijeka.com/files/bidow.pdfIn PDF document text
    • http://www.juniorcollege.cl/ckfinder/userfiles/files/sofedele.pdfIn PDF document text
    • https://itracmediav5.com/ckfinder/userfiles/files/timebanepaje.pdfIn PDF document text
    • https://tauthuy.vn/upload/files/58229447444.pdfIn PDF document text
    • http://kgmda.com/upload/files/vojilovepixazu.pdfIn PDF document text
    • http://chafewyuok.handysociality.com/upload/files/paxovomarapevufen.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=how+to+clear+cache+of+app+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_off0000e05e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE05E 17084 bytes
SHA-256: 385f609e2a12515db815a5208e5c3215ae20b1e4acbe659296611f110b017578
font_01_sfnt_off00010c85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C85 10624 bytes
SHA-256: 6b2ee5f47cc9ebd8564fa81483127367fb64978e2d2b181f554e8ed20bca09f6
font_02_sfnt_off000124bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124BD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1