Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4459dfb68d45c43…

MALICIOUS

PDF

70.3 KB Created: 2021-09-26 00:59:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 0bda4076a73f29fc5d260c7e665a0085 SHA-1: 4f3790d4e58d26d6a293a7c33c545c8e93464741 SHA-256: d4459dfb68d45c43dfbbad9df43925d28e0ecbb1ccd4f6e9828117f7d7029caa
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links to external resources, many of which are hosted on disposable domains and appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The presence of PDF_RANDOM_URL_LINK and PDF_SEO_DISPOSABLE_LINK_FARM heuristics further supports this, suggesting the PDF is designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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
  • 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://pistant.ru/uplcv?utm_term=extra+lives+apk+download PDF link annotation
    • http://kssi.ir/public/userfiles/file/teguzebutizutitev.pdfIn PDF document text
    • https://svetplus.com/userfiles/files/52589689207.pdfIn PDF document text
    • https://pezenasenchantee.fr/userfiles/file/dedumopalinavo.pdfIn PDF document text
    • http://www.herbertvanderbrugghen.nl/draft/65617998527.pdfIn PDF document text
    • http://bora.su/ckfinder/userfiles/files/17941823496.pdfIn PDF document text
    • https://52fantasies.com/home/holly/public_html/ckfinder/userfiles/files/papegidadexezasa.pdfIn PDF document text
    • https://mmgrowersg.com/ckfinder/userfiles/files/fovebokogilufupaponesula.pdfIn PDF document text
    • http://www.peritaonline.es/ckfinder/userfiles/files/5596361215.pdfIn PDF document text
    • http://accessibilite-salle-eau.com/ckfinder/userfiles/files/gumepatemuvetujowep.pdfIn PDF document text
    • http://uptownherndon.com/uploads/files/36832522261.pdfIn PDF document text
    • https://economiadecomunion.com/ckfinder/userfiles/files/8525255767.pdfIn PDF document text
    • https://jewfri.kr/files/image/files/mototebiripemunivi.pdfIn PDF document text
    • https://erdemlerkoleji.com/resimler/files/demazexaxoz.pdfIn PDF document text
    • http://erpos.sk/data/files/ruxenuneruso.pdfIn PDF document text
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1614408b4cac9f---2843273609.pdfIn PDF document text
    • http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1614c8e2aa999d---jefonipijozufaxerexeluto.pdfIn PDF document text
    • http://spain-ex.com/images/blog/file/50027247345.pdfIn PDF document text
    • http://www.roosprommenschenckelfoundation.nl/ckfinder/files/files/jisiligisutitivavizo.pdfIn PDF document text
    • https://internationallanguagenavigators.com/media/xafemopujige.pdfIn PDF document text
    • http://jts-electrical.co.uk/ckfinder/userfiles/files/tuwinasixegefirenelekip.pdfIn PDF document text
    • http://abwingstop.com/uploads/files/36988286335.pdfIn PDF document text
    • http://th-hl.com///upload/files/87895107170.pdfIn PDF document text
    • https://bevasilicones.in/userfiles/file/xenogadotidupamakew.pdfIn PDF document text
    • https://korankertas.com/contents/files/43526983864.pdfIn PDF document text
    • http://s292376414.onlinehome.fr/datas/imgmail/file/73641963640.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_off0000b1f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1F9 10716 bytes
SHA-256: 8dbd5199be4237a5b6d473a2b227be67302112f4902fa424fc597380e577180a
font_01_sfnt_off0000cabc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCABC 16284 bytes
SHA-256: ac7888556cb5529c9047a012c3a7ed6ba9593b36d3b891f238cbf9c1fadbae34
font_02_sfnt_off0000f3b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3B2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1