Malicious PDF — malware analysis report

Static analysis result for SHA-256 32b3bb2f52707b45…

MALICIOUS

PDF

87.0 KB Created: 2021-09-21 15:17:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: c5c35c9920ecae69aa989a2c60a52d82 SHA-1: 583ae2e176fb26bf408fe09336b34c694a68e8e1 SHA-256: 32b3bb2f52707b45d87f2bbe5259f7c527618752aa2f024f5688f4773c87d5ff
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to disposable domains and structured as a link farm, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were directly extracted, the PDF structure and embedded URLs are indicative of a spearphishing attachment used to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://wastran.ru/uplcv?utm_term=best+strategy+games+iphone+free PDF link annotation
    • http://www.enfersalus.com/ckfinder/userfiles/files/jigojitifujiguzitokilube.pdfIn PDF document text
    • http://www.pvvc.cz/files/jogex.pdfIn PDF document text
    • https://vroa.pl/chplusfiles/file/79793736348.pdfIn PDF document text
    • http://www.sandzthabapanel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16132927cb8116---joketifokakod.pdfIn PDF document text
    • http://tonyprins.nl/images/uploads/file/gawamigefiwe.pdfIn PDF document text
    • http://ambulatorioveterinariocigliano.com/userfiles/files/61510825239.pdfIn PDF document text
    • http://ipceurope.com/assets/file/97261472582.pdfIn PDF document text
    • http://sakulchaiplace.com/Uploads/file/85575913733.pdfIn PDF document text
    • http://massimosusto.eu/userfiles/files/sumopoxisesifigadewajeg.pdfIn PDF document text
    • http://kondicionery-pushkino.ru/upload_picture/file/sugaxetovizafozusasasuzi.pdfIn PDF document text
    • http://yilip.net/userData/board/file/80869037884.pdfIn PDF document text
    • http://csim.jp/ckeditor/uploads/files/8642126334.pdfIn PDF document text
    • http://fkm-lux.by/var/upload/file/46498366757.pdfIn PDF document text
    • https://pchome.uzai.ca/upload/files/nugaweguv.pdfIn PDF document text
    • https://confetti-seasons.ru/upload/files/pimefi.pdfIn PDF document text
    • http://novosib-sport.ru/ckfinder/userfiles/files/22207788688.pdfIn PDF document text
    • http://xsjsbzrw.com/uploads/files/bijegafamine.pdfIn PDF document text
    • http://honmamon-s.com/img_seminar/userfiles/file/wimufatuwa.pdfIn PDF document text
    • http://dienlanhlongan.com/upload/files/koleluleri.pdfIn PDF document text
    • http://cnpair.com/userfiles/file/xedujotebirelinuja.pdfIn PDF document text
    • http://newmob.it/userfiles/files/35175090181.pdfIn PDF document text
    • http://manisafar.com/basefile/marcosafarir/files/xipaxatarasoxetiborilezu.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_off0000ee8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE8B 17756 bytes
SHA-256: 5bcd994d21885075b747280d0e1346ece5ce70cbf88fc808262943e0ccaf7700
font_01_sfnt_off00011cb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CB4 10924 bytes
SHA-256: 10478bc4479a07c32d6906a1c11012cd25f326632b38df7bf4e17b74c0bbf45b
font_02_sfnt_off000135e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135E9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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