Malicious PDF — malware analysis report

Static analysis result for SHA-256 24099944a67d0e5a…

MALICIOUS

PDF

90.5 KB Created: 2021-09-19 01:14:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 4855b7deb808d4578f3d723c1f7f56b7 SHA-1: b7b9d057213a7350649a8407865ffa66a52febf0 SHA-256: 24099944a67d0e5a00aff5ea42c7dd019b2c03da2b90b2ec8c845aceb3724c16
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, with one heuristic identifying it as a link farm on disposable hosting, suggesting a phishing or redirection scheme. While no scripts were explicitly extracted, the PDF format itself can embed JavaScript, which is often used to facilitate malicious actions like downloading further payloads or redirecting users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 http://kleinschadenexpert.com/userfiles/file/21170832283.pdf In PDF document text
    • https://polytex.de/sites/default/files/46913841056.pdfIn PDF document text
    • https://laplacedesstores.com/upload/file/tajobogidegidoloj.pdfIn PDF document text
    • http://studioagm.it/userfiles/files/40314516714.pdfIn PDF document text
    • http://basar-hemeringen.de/ablage/userfiles/files/gezaledoredojavifomov.pdfIn PDF document text
    • http://coffee33.ru/archive/file/vojibodefifewan.pdfIn PDF document text
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/3l0l6sc5pschovc4a5tajkjle8/81356654084.pdfIn PDF document text
    • http://mobil-tech.com/files/tatinedutatu.pdfIn PDF document text
    • http://snuhonors.com/userfiles/file/52378906174.pdfIn PDF document text
    • https://venefoil.com/ckfinder/userfiles/files/84393419154.pdfIn PDF document text
    • https://bdaudit.ro/userfiles/file/21577217520.pdfIn PDF document text
    • http://rootbeadmill.com/upload_fck/file/2021-9-12/20210912202540627952.pdfIn PDF document text
    • https://olivermilk.vn/tctt/sites/aaa/file/xalokesi.pdfIn PDF document text
    • http://terremeraude.com/userfiles/file/56273761701.pdfIn PDF document text
    • http://vallovin.it/userfiles/files/kanuwibasebizizerigipas.pdfIn PDF document text
    • http://helderlive.nl/ckfinder/userfiles/files/33314200873.pdfIn PDF document text
    • https://abogadosaccidentealicante.centralcms.cloud/galeria/files/28662668551.pdfIn PDF document text
    • https://bhandarisurgical.com/ckfinder/userfiles/files/25935132217.pdfIn PDF document text
    • https://luckysurface.itweald.com/uploads/files/613283455b6a9.pdfIn PDF document text
    • http://www.poliklinika-hb.cz/userfiles/file/jikojuponemaga.pdfIn PDF document text
    • http://xn--2-140-swe8h.xn--p1ai/files/wikojaxemadasafuvisapo.pdfIn PDF document text
    • https://www.vignolaweb.it/ckfinder/userfiles/files/95846079610.pdfIn PDF document text
    • http://balashixa.inhome360.ru/admin/ckfinder/userfiles/files/tivijejijuzewixujotovad.pdfIn PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613beeb192df5---51504835879.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=windows+media+player+on+androidPDF 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_off0000fb32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB32 10648 bytes
SHA-256: 105a5c8490360f4b87d010c333c518f630020a7809818e7269ca8705630ffb5a
font_01_sfnt_off0001138f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1138F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012ba1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BA1 18692 bytes
SHA-256: 5f09ebdac7bbb22378d43a7dd7d04275b7eaa3b60379aa5ce940b37713fee7d1