Malicious PDF — malware analysis report

Static analysis result for SHA-256 552621689826233e…

MALICIOUS

PDF

72.4 KB Created: 2021-10-02 12:33:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: d92189eada453b5e51b70842e84861fa SHA-1: 13487f058360a3029e0924a6d041c294092e3d85 SHA-256: 552621689826233e9bb85be86211d5eac3bf1885b430724c36fe6a6b80573d2c
146 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URIs, with heuristics indicating a link farm on disposable hosting. The primary URLs point to domains that appear to be used for hosting malicious PDFs, suggesting the document's purpose is to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9940

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://pixomot.ru/uplcv?utm_term=black+mold+in+water+supply PDF link annotation
    • https://yptea.com/data/fckeditor/files/gurobimigurujezo.pdfIn PDF document text
    • https://fatheragneliti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614b8d61a497a---7676401910.pdfIn PDF document text
    • http://falconltd.pl/cache/file/15380461845.pdfIn PDF document text
    • http://kernenshepler.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/43036834291.pdfIn PDF document text
    • http://pho32shabu.com/uploads/files/viduxufifewazixi.pdfIn PDF document text
    • http://dok-vo.ru/userfiles/file/negijibafipifiko.pdfIn PDF document text
    • http://smartvoicecom.com/userfiles/zukozatenufawopajasepuze.pdfIn PDF document text
    • http://purepassion.pl/userfiles/file/80354839916.pdfIn PDF document text
    • http://rajhansnursery.com/userfiles/file/19992472349.pdfIn PDF document text
    • https://www.miotsukushi.or.jp/system/ckfinder/userfiles/files/49818960055.pdfIn PDF document text
    • http://palestraarkadia.it/userfiles/files/31781891711.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161306ff934de3---31950184156.pdfIn PDF document text
    • https://mkontakt.pl/dat/file/weguvakijemege.pdfIn PDF document text
    • http://www.pacautomarketing.com/file/42538150079.pdfIn PDF document text
    • http://185.33.116.145/~acus01/upload/files/nofiwu.pdfPDF link annotation
    • http://whygzy.com/Media/Uploads/files/62800897156.pdfIn PDF document text
    • http://daimarconstrucciones.com/images/admin/file/44812896204.pdfIn PDF document text
    • http://placc.info/up_image/50235532596.pdfIn PDF document text
    • http://ranahytta.com/ckfinder/userfiles/files/66900134000.pdfIn PDF document text
    • https://cbdc.co/uploads/ckfinder/userfiles/files/45715692449.pdfIn PDF document text
    • http://abbwingslynnhaven.com/uploads/files/18447585879.pdfIn PDF document text
    • http://baiduvpn.com/upload/files/25190020687.pdfIn PDF document text
    • https://hotararicedo.ro/files/files/38352412384.pdfIn PDF document text
    • https://estatecambodia.com/htdocs/cljr/data/files/zopagu.pdfIn PDF document text
    • http://jocoseatee.com/userfiles/files/59053980018.pdfIn PDF document text
    • https://dermatologie-francophone.com/userfiles/file/viwewafobuj.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_off0000b69a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB69A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ceb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEB1 11120 bytes
SHA-256: fc6a3a86c756176a31488ee64ac3b8aa53806ea968c105ab9c00059d4a190e3d
font_02_sfnt_off0000e8b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8B9 17208 bytes
SHA-256: e23a38cf6b82529125dd52fc6e1cce2d6251a9e95c2bd61dbee07b54cc4f26f8