Malicious PDF — malware analysis report

Static analysis result for SHA-256 df9266e3db353782…

MALICIOUS

PDF

84.7 KB Created: 2021-09-19 12:06:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: c4d88080e1ed321b440444c3462e213f SHA-1: a3f0bbedbe3ccac5bd4fe408e7aff5178c00c794 SHA-256: df9266e3db35378252daa8943d2e0d21b0edaaed85ba6cb2c6d3bfd7a4b312b3
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan' and an ML classifier indicating maliciousness. The document contains a large number of embedded URLs, many pointing to disposable hosting, suggesting a link farm or phishing lure. While no scripts were explicitly extracted, the presence of numerous external URIs and the overall detection profile strongly indicate a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://cructi.ru/uplcv?utm_term=camera+note+20+ultra+vs+iphone+12+pro+max PDF link annotation
    • https://billard-hauri.ch/userfiles/file/donavarug.pdfIn PDF document text
    • http://obras.ru/sites/default/files/uploads/wetuzugewixadisenopal.pdfIn PDF document text
    • http://cdn.eagle.mn/uploads/userfiles/files/40643399885.pdfIn PDF document text
    • http://sinostandards.net/upload/files/45485906124.pdfIn PDF document text
    • http://propertiesforrent.com/userfiles/file///27769539849.pdfIn PDF document text
    • https://fajanav.com/aym_image/files/2213011745.pdfIn PDF document text
    • http://banquat.com/userfiles/files/20113524343.pdfIn PDF document text
    • https://austdoorcaocap.com/upload/files/3519427657.pdfIn PDF document text
    • https://dragonexpressml.com/userfiles/files/27287389623.pdfIn PDF document text
    • http://gibisch.biz/files/files/pikujasazari.pdfIn PDF document text
    • https://almuhja.ps/ckfinder/userfiles/files/lakifoxe.pdfIn PDF document text
    • http://culbertsonlawyer.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/moxozujeb.pdfIn PDF document text
    • http://cabini.it/userfiles/files/34548301201.pdfIn PDF document text
    • https://gikguamerica.com/userfiles/file/21249077130.pdfIn PDF document text
    • https://korovin.org/site/img_ufiles/bumugejunabomefe.pdfIn PDF document text
    • http://phuocthuan.vn/images/pic/file/roveribasa.pdfIn PDF document text
    • http://bongoes62.dk/userfiles/file/givasaw.pdfIn PDF document text
    • https://childprotectionindia.com/lexcyberia/userfiles/files/dukalalegixaner.pdfIn PDF document text
    • https://baptistfriends.org/media/guzizanixofavunaz.pdfIn PDF document text
    • https://sicurezzaips.it/uploads/file/femarezu.pdfIn PDF document text
    • https://alaskaproauto.net/nbloom/fckuploads/file/jesoridetusiziven.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144d8851a37c---2907768086.pdfIn PDF document text
    • http://pc580.cn/upload_fck/file/2021-9-6/20210906211339131597.pdfIn PDF document text
    • http://lacasedescaraibes.fr/file/nununefowaletodu.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613990f85e86f---ragekajidetusifeka.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_off0000e2c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2C4 18320 bytes
SHA-256: c11e0a323c89c6c9e4e92ec246cb633b94ac59d4882fc7aeae45a634ec26f03d
font_01_sfnt_off000112fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112FE 11108 bytes
SHA-256: 04aaf984e97c29c3d5e041e5cf3aa69a3bde8515a2f6bcc745f101856e881167
font_02_sfnt_off00012cd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CD1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1