Malicious PDF — malware analysis report

Static analysis result for SHA-256 732d09cec97d1286…

MALICIOUS

PDF

82.3 KB Created: 2021-09-10 19:33:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 77d96170000b7ed85b8a87b678e66a1d SHA-1: 1afff32e13800e8d46496455a20b2b005904d867 SHA-256: 732d09cec97d1286bc02cdc9c80fedf372c8def267ecf82cb46b45d8da602dc6
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are hosted on suspicious domains and appear to be part of a link farm, as indicated by the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic. The presence of a high ML score and ClamAV detection further supports its malicious nature. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the overall structure suggests an attempt to redirect users to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://siciny.eu/userfiles/file/ligiwami.pdf
    • https://tunguoilon.tunhua.vn/ipp/images/uploads/files/gulasoliw.pdf
    • https://ccichn.vn/data/upload/file/vizikixejokurokiv.pdf
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ec6a84ba3e---14042452939.pdf
    • http://qlionshousing.ca/userfiles/file/45626622378.pdf
    • http://abwingsbuffalo.com/uploads/files/44722775845.pdf
    • https://renewone.de/files/40508651481.pdf
    • http://fabtur.ru/upload/files/62725705849.pdf
    • https://almondzwealth.com/administrator/imagetemp/file/nisedekimowavutewiselofuk.pdf
    • http://mydreamtuscanwedding.com/editor_up/58929863202.pdf
    • http://pokemom2.com/uploads/files/nabeminelijogovebo.pdf
    • https://istanajpdua.com/contents/files/39858693847.pdf
    • http://crystalnymph.by/wp-content/plugins/super-forms/uploads/php/files/ade471419ed97f80069d8bf9c18a7691/subikuvamusi.pdf
    • http://zrdb-drogbud.pl/Upload/file/sabizuniwovosamaro.pdf
    • http://sumtinathholidays.com/admin/uploadfiles/file/nixifabudukuwikujo.pdf
    • http://papinchess.ru/userfiles/file/70830454911.pdf
    • http://xn--krmer-dnnebacke-1kb72b.de/files/file/15180622127.pdf
    • http://vipnovini.bg/root/f/uploads/files/wakezirukeze.pdf
    • http://qapoll.com/2015/vat/upload/files/pezenabapalo.pdf
    • https://www.barrau-philippe-sedeco.fr/ckfinder/userfiles/files/namatebarusiduwugone.pdf
    • http://amuseonline.com/absite/userfiles/file/gazetut.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=the+brothers+grimm+full+movie+download
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dc5b.bin
aa57c31be546cadbea15ffeca14581d62a1fed23e76ecbcd9c9c692ca2ee3d2c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDC5B 11156 bytes
font_01_sfnt_off0000f621.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF621 16792 bytes
font_02_sfnt_off00010e33.bin
d914ef4b0c18cafbfe040c4e1eabd28d5608be8fb2d0c1c86ad615f3658a9c46		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10E33 17664 bytes

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