Malicious PDF — malware analysis report

Static analysis result for SHA-256 e50cfafeaa556d3b…

MALICIOUS

PDF

69.8 KB Created: 2021-09-30 10:30:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 736db95a7c808ba3dc19177ee3532588 SHA-1: 4a01aa3020dea39fa33283b252e8afe38a84e552 SHA-256: e50cfafeaa556d3b2ba300a7d225243a72991655ca0f95e653b7ace4acdf3107
126 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. The PDF contains numerous embedded URLs pointing to disposable domains, characteristic of a link farm designed to redirect users to malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests this phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://kurek-rowery.pl/user_pict/file/2266293734.pdf In PDF document text
    • https://bushregenerators.net/userfiles/files/pogamofoponujuliroritozu.pdfIn PDF document text
    • http://ladna.pl/user_images/file/pojurerakawujowiwox.pdfIn PDF document text
    • http://tostonet.cl/ckfinder/userfiles/files/85863825469.pdfIn PDF document text
    • https://pfhotel.gr/ckfinder/userfiles/files/fuvozilegedutu.pdfIn PDF document text
    • http://saaretravel.ee/images/file/womerosis.pdfIn PDF document text
    • https://portalbime.com/UploadedFiles/New/file/nupoledagizuva.pdfIn PDF document text
    • https://songod.vn/uploads/image/files/74346416748.pdfIn PDF document text
    • http://kurskodkb.ru/page_edit/_samples/userfiles/files/pagamuwewofe.pdfIn PDF document text
    • https://gadesign52.com/uploads/files/202109061655131466.pdfIn PDF document text
    • http://cieplej.pl/imgturysta/file/lolepenarudisi.pdfIn PDF document text
    • http://thekitchendesignstudio.org/uploads/files/18503880335.pdfIn PDF document text
    • https://vientangluc.com/upload/files/45822064844.pdfIn PDF document text
    • http://cudicio.it/images/file/dutibogexukibevovuvadim.pdfIn PDF document text
    • http://flygarfield.net/userfiles/file/98673720301.pdfIn PDF document text
    • https://superlitefan.com/uploads/files/tudadexajilazanomo.pdfIn PDF document text
    • http://zaintik.org/files/galeria/files/97421200898.pdfIn PDF document text
    • http://lepixz.com/userfiles/file/kasorunovosuririture.pdfIn PDF document text
    • https://proia.bg/userfiles/file/38179332027.pdfIn PDF document text
    • http://abarappresentanze.it/userfiles/files/xifopusubapotipalirok.pdfIn PDF document text
    • http://coverybox.box8websites.com/ckfinder/userfiles/files/53242351979.pdfIn PDF document text
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1614b038eeaf73---45269371238.pdfIn PDF document text
    • http://clubsahdianagalati.ro/upload/editor/file/nezubujuvosimofifiguluwoj.pdfIn PDF document text
    • http://ljhalls.com/wp-content/plugins/super-forms/uploads/php/files/085fadac0890daed54d437e4d4a31d7b/ridakosisigezebewuxuvam.pdfIn PDF document text
    • http://metrominicabs.com/survey/userfiles/files/wokugaros.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=powerful+dua+for+parents+health+and+long+lifePDF 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_off0000b34d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB34D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cb64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB64 10964 bytes
SHA-256: ea85ed5f085a9cad7172ce80f9cfb17c533abe01f823f12f218054719e63bb22
font_02_sfnt_off0000e4a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4A4 14608 bytes
SHA-256: 6aa6e2dfeba26c8b2642e2a570563cd8ecb7e248c0a4824768f82a70d9cf08a8