Malicious PDF — malware analysis report

Static analysis result for SHA-256 b66aadaf01453432…

MALICIOUS

PDF

74.3 KB Created: 2021-09-11 10:30:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 1195f4084ac444c99acfe772a4e41229 SHA-1: 41eb9d19e2c373fc5356e7099ecc59a656b4a8ad SHA-256: b66aadaf01453432210b1ddbca0d418695fe1d1b1f2bc4f05fa2795b8a239495
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external URIs and is identified as a link farm hosted on disposable domains, indicating a strong intent to redirect users to malicious sites. The presence of embedded URLs and the nature of the heuristics suggest this document is designed to facilitate phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://cructi.ru/uplcv?utm_term=deadpool+on+xmen PDF link annotation
    • https://grafconsulting.pl/Upload/file/luxugojuse.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613804f937c36---12152951738.pdfIn PDF document text
    • http://letresorellebio.it/userfiles/files/46253257302.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/161368f825c2a9---jerobuwaxebotakoribusun.pdfIn PDF document text
    • http://marcobernini.it/userfiles/files/91578409355.pdfIn PDF document text
    • http://zjnep.com/ckeditor/ckfinder/userfiles/files/nevavojuxagor.pdfIn PDF document text
    • http://gima.ge/admin/ckeditor/ckfinder/userfiles/files/81741633288.pdfIn PDF document text
    • https://wisestudentz.com/userfiles/file/miwulovek.pdfIn PDF document text
    • http://serbanindustrialconstruct.ro/uploads/files/leduwakubopebevuvugedigo.pdfIn PDF document text
    • http://pomelieagency.com/userfiles/files/35100606208.pdfIn PDF document text
    • http://www.velkoobchod-man.eu/ckfinder/userfiles/files/12858815090.pdfIn PDF document text
    • http://xn--ob0bjxt9h99icicrvkksa421cwwp7hiv4d6a.com/ckfinder/userfiles/files/70392338207.pdfIn PDF document text
    • https://rovetco.com/userfiles/file/29675439272.pdfIn PDF document text
    • http://kondicionery-lobnya.ru/upload_picture/file/porowur.pdfIn PDF document text
    • http://cleanking.net/userData/board/file/noriganudegagid.pdfIn PDF document text
    • http://taihegas.com/filespath/files/20210904171004.pdfIn PDF document text
    • http://ohmytour.kr/FileData/ckfinder/files/20210908_66E9B1E108DEE3CB.pdfIn PDF document text
    • http://bekkercoon.ru/ckfinder/userfiles/files/17547503298.pdfIn PDF document text
    • https://ikitellirezistans.com/upload/files/tedazagomobebakegoxu.pdfIn PDF document text
    • http://bernendorf.ru/userfiles/file/xububaxomugar.pdfIn PDF document text
    • http://zawodydrwali.pl/app/webroot/userfiles/file/kipesubixamapuvudevoxox.pdfIn PDF document text
    • https://clubkdo.fr/img/pics/files/dejipisutibigagatev.pdfIn PDF document text
    • http://iact2001.com/userData/board/file/9426485802.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_off0000c039.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC039 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d850.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD850 10200 bytes
SHA-256: 9b3a198c71ae8e0a7834d1ca0657736f406955d129412d4390b044db38bd8bd0
font_02_sfnt_off0000ef16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF16 17420 bytes
SHA-256: 7970790fa03c954623f9add6b2e426812ee549ff3fdb3f5fb598b9c54c2903ef