Malicious PDF — malware analysis report

Static analysis result for SHA-256 e1d0a01d5d4661b4…

MALICIOUS

PDF

97.3 KB Created: 2021-09-13 06:54:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: f81d3378dc2df365d7dded8b703481e2 SHA-1: 24e497dc4b3d415c8d80c007ea1ba84fdaad45d1 SHA-256: e1d0a01d5d4661b428ad9d4e331c8a7cafd9a7e65247dc8e2a1254385187dbc9
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, indicating a malicious intent to redirect the user to potentially harmful websites. The critical heuristic 'SE_SECRET_RECOVERY_LURE' strongly suggests the document's purpose is to trick users into revealing sensitive recovery information. The ML classifier and ClamAV detection further corroborate its malicious nature, pointing towards a phishing or credential harvesting attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Recovery secret / private key request critical SE_SECRET_RECOVERY_LURE
    Document requests recovery phrases, private keys, backup codes, or saved passwords. Requests for these secrets in a document are high-risk.
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://archism.ru/uplcv?utm_term=adobe+photoshop+2021+crack+mac PDF link annotation
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/3d467adf8596bacec0a2334fc2365d05/46398110679.pdfIn PDF document text
    • http://dexgerm.com/data/file/userfiles/files/27147969974.pdfIn PDF document text
    • http://mgrima.com/files/file/13297119950.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/1613c12cf30cfc---mibafepafewofeg.pdfIn PDF document text
    • https://brothers-music.com/ckfinder/userfiles/files/jonobigapadosin.pdfIn PDF document text
    • https://oglethorpeclub.org/~oglethor/UserFiles/file/mujaxijajarefalelamezoru.pdfIn PDF document text
    • http://gandolfiarchitetti.com/userfiles/files/99367494645.pdfIn PDF document text
    • http://avtrak.ru/ckfinder/userfiles/files/sewovu.pdfIn PDF document text
    • http://phongkhamthienhoa.vn/images/files/8134731655.pdfIn PDF document text
    • http://giasudaihocsupham.com/Images_upload/files/28715891621.pdfIn PDF document text
    • http://www.hydro-tg.pro/upload/file/rejetevisunero.pdfIn PDF document text
    • https://bodzlomu.com/userfiles/file/josanuri.pdfIn PDF document text
    • http://mudrkanuch.sk/editor_uploads/system/files/73522346076.pdfIn PDF document text
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130bbfb17102---47311450513.pdfIn PDF document text
    • http://s8radziejowice-paszkow.pl/userfiles/file/28254879498.pdfIn PDF document text
    • http://formel1vermietung.de/userfiles/file/17391757127.pdfIn PDF document text
    • http://4els.ru/uploads/images/files/jajusukivulofopeguxibef.pdfIn PDF document text
    • http://daieimotors.com/js/upload/files/zobir.pdfIn PDF document text
    • http://dream-mebel.com/pic/file/6214907390.pdfIn PDF document text
    • https://chungcungoaigiao.vnpec.xyz/uploads/files/kelagumulel.pdfIn PDF document text
    • http://e-baze.lv/images/site/file/sokefuzosopixum.pdfIn PDF document text
    • https://asfus.net/virgsurv/userfiles/file/naxufusopezokegoxatafote.pdfIn PDF document text
    • 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_off00011242.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11242 11044 bytes
SHA-256: 5654783e0f81fbf4cdf960d3fad81fba72f4cc51b203c73ec3469276f998dc3d
font_01_sfnt_off00012be4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BE4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000143f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x143F6 19912 bytes
SHA-256: 44d917cc5e161c56f3a0907d98ddcbfbf8384c9a9c19a32fdf89b945596b7081