Malicious PDF — malware analysis report

Static analysis result for SHA-256 79f99aef609bc56b…

MALICIOUS

PDF

72.1 KB Created: 2021-09-17 05:31:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 16b0a11dd866ec9c40be94b5af2d7b35 SHA-1: c457bd50fbe3c61f2748d7dcb6d315821601fcfd SHA-256: 79f99aef609bc56bdad24628eed471f1e95de61e0b4e05cc3727647981fe24f2
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs, 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. While no scripts were directly extracted, the structure and numerous links suggest the PDF is designed to redirect users to malicious sites, potentially for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 https://pistant.ru/uplcv?utm_term=download+minecraft+in+mobile+free PDF link annotation
    • http://myflora888.com/ck_files/files/593489668.pdfIn PDF document text
    • https://bachson.net/upload/file/32082952186.pdfIn PDF document text
    • http://wych123.com/upload/files/19574554703.pdfIn PDF document text
    • http://gutachterbewertung.de/userfiles/file/25844609744.pdfIn PDF document text
    • http://villa-carlshorst.de/sites/default/files/file/41084740598.pdfIn PDF document text
    • http://davidhammerstein.org/userfiles/file/52951433171.pdfIn PDF document text
    • https://meritumptt.pl/dokumenty/file/83649413610.pdfIn PDF document text
    • http://levakov132.ru/userfiles/file/tunipibip.pdfIn PDF document text
    • https://chataigne-cevennes.fr/imgs/files/tivesemevafubiminuxebas.pdfIn PDF document text
    • http://consorzio-csa.it/userfiles/files/debizijonesezejebuza.pdfIn PDF document text
    • http://bekkercoon.ru/ckfinder/userfiles/files/61125238234.pdfIn PDF document text
    • http://savages.lu/imagesRTE/files/17785141488.pdfIn PDF document text
    • http://aurora-c.jp/files/files/39554701183.pdfIn PDF document text
    • http://gpe-el.pro/ckfinder/userfiles/files/jevisipazogavunava.pdfIn PDF document text
    • http://nc-israel.ru/upload/files/guwubebup.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131360728137---jobujijaguvizuzigewabe.pdfIn PDF document text
    • https://segurodegranizo.ar/noticias/fckeditor/file/sozukejab.pdfIn PDF document text
    • https://vasutaszeneiskola.hu/ckfinder/userfiles/files/81964634054.pdfIn PDF document text
    • http://daiduongmetal.com/uploads/ckfinder/files/gaguvebozixamatube.pdfIn PDF document text
    • http://shukokai-voves.fr/userfiles/file/69921384260.pdfIn PDF document text
    • http://brenno-tojestto.pl/userfiles/file/24976133506.pdfIn PDF document text
    • http://labonguyenhoang.com/img-chamthi/files/87714142125.pdfIn PDF document text
    • https://tjp2-hotlink-j3t.com/contents/files/15597041052.pdfIn PDF document text
    • http://shamayachts.com/upload/file/35635262577.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_off0000b9d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB9D4 15864 bytes
SHA-256: 2a27718a8511478d353dabfa2fad6ac213e909d1a6d1f82fd251a7013013006b
font_01_sfnt_off0000e243.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE243 10696 bytes
SHA-256: acb228e53a2362e453bcdbcede8011bbc4d906d4fb4637859314464939514284
font_02_sfnt_off0000fac6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAC6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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