Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c138b8c899158bd…

MALICIOUS

PDF

81.7 KB Created: 2021-09-21 11:53:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 6b5cc7d571ca38bacc5d51ce7dea9042 SHA-1: e8d8aa1c088dd3e47fa53468b6243831a98b94fa SHA-256: 9c138b8c899158bd7188be3015330fa42107e9220aec8c2a887701c2a282e99d
126 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm with numerous external URIs pointing to other PDF files on disposable or unknown domains. The primary purpose appears to be directing users to potentially malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 http://qlinairnv.be/userfiles/file/pupomipibukoxaduzeser.pdf In PDF document text
    • http://slovoveri.org/userfiles/demupegafa.pdfIn PDF document text
    • http://lesmashclub.com/imgUpload/files/95168355086.pdfIn PDF document text
    • http://farashimirooz.com/files/turosepekuluze.pdfIn PDF document text
    • https://chungangroup.com/uploads/files/202109062130104834.pdfIn PDF document text
    • http://nathulaldasptti.com/ckeditor/ckfinder/userfiles/files/bifateruked.pdfIn PDF document text
    • http://gulfcoastlist.com/userfiles/file/49049673344.pdfIn PDF document text
    • http://hytechplus.com/userfiles/file/nupobu.pdfIn PDF document text
    • http://malabarisproducoes.com/arquivos/files/87053201336.pdfIn PDF document text
    • http://nkmate.com/FileData/ckfinder/files/20210913_5D81E847C2A5816C.pdfIn PDF document text
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/6agecput5h5c9v4obtqv0ea28a/27569925394.pdfIn PDF document text
    • https://aymsoft.us/aym_image/files/gurisivemidufo.pdfIn PDF document text
    • https://hijaulumut.com/contents/files/76560650558.pdfIn PDF document text
    • http://hong-tour.com/FileData/ckfinder/files/20210912_865218E3306C200C.pdfIn PDF document text
    • https://stpetejazz.com/wp-content/plugins/super-forms/uploads/php/files/f6urjnoos1etq8d77f0ic0s706/murexilelib.pdfIn PDF document text
    • https://festival-bg.com/media/ckuploads/files/24022045319.pdfIn PDF document text
    • https://ahl2005.com/ckfinder/userfiles/files/lexedajebutebedekadimup.pdfIn PDF document text
    • https://yodishit.com/uploads/userfiles/file/vudadipiwaxoti.pdfIn PDF document text
    • http://xn--9w3b11kh5l.com/ckupload/files/70177338102.pdfIn PDF document text
    • http://colegiosantarosa.com/uploads/imagem/file/64748350750.pdfIn PDF document text
    • https://www.auto-ecole-rive-droite.fr/ckfinder/userfiles/files/dirimuradoximaginid.pdfIn PDF document text
    • http://bhk-aindling.com/userfiles/files/76144440942.pdfIn PDF document text
    • http://jagodkaprzedszkole.pl/userfiles/file/zujagibawo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=phone+screen+unlockPDF 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_off0000dbdd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBDD 10168 bytes
SHA-256: a362530af065437b796e56ec518a0595abf8ba478457716a69cedc0403b35d60
font_01_sfnt_off0000f28d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF28D 18280 bytes
SHA-256: 30dcf03591f34bdc241d488d92462bd2b1ff91ca2fa16a56ed3f2aa12d718a70
font_02_sfnt_off00012174.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12174 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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