Malicious PDF — malware analysis report

Static analysis result for SHA-256 2426f70d0cc19ea6…

MALICIOUS

PDF

77.1 KB Created: 2021-09-09 10:31:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 26c346f7a398f19ec92a3ad76c04ec63 SHA-1: b7a048bfbecfe1fb45c7f453598f6e9bf1893b1f SHA-256: 2426f70d0cc19ea6a7c5b5ae093541d800bea79568878e03702abdad84dc3743
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to various domains, many of which are identified as part of a link farm. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic indicates a high likelihood of malicious intent, possibly for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and numerous external links suggest an attempt to redirect the user to malicious content. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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 https://sooryasales.com/uploads/file/pewizojagiwadaxebagepu.pdf
    • https://bandotrading.com/uploads/file/xutarefor.pdf
    • http://toonesk.com/upload/37259069175.pdf
    • http://7linc.com/uploadfiles/fckeditor/20210902/file/16305259252494.pdf
    • http://cbestdesign.com/ckfinder/images_store/files/xalibemulido.pdf
    • http://identik.hu/editor_up/wavazujokilakujose.pdf
    • http://angelascanu.it/uploads/file/17104894356.pdf
    • https://livbiopharma.com/userfiles/file/pemori.pdf
    • http://greenlivinggarden.com/htdocs/UserFiles/file/pinikafegugofuzigiwowo.pdf
    • https://ismet.com.br/ckfinder/userfiles/files/vovoda.pdf
    • http://nceed.kr/pds/userfiles/files/dasoxatilotov.pdf
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/f7ceaf7622bd04478efe51ba28aae103/gebinib.pdf
    • http://arenabilardo.com/data/_files/digup.pdf
    • https://erdemlerkoleji.com/resimler/files/xumobu.pdf
    • http://roseeskin.com/userfiles/file/20210906130059.pdf
    • https://bluza-shop.ru/content/File/peduwitazegotedakibav.pdf
    • http://vnndt.com/Images_upload/files/sidajosadifebuletude.pdf
    • http://usatovl.ru/upload/fckeditorfile/25227748532.pdf
    • http://www.prieteniitehnicii.ro/documente/file/23781494033.pdf
    • https://autonoleggioassereto.com/file/64006683197.pdf
    • http://www.lircai.com/web/inline/file/gipawokepogixuxe.pdf
    • http://merydian.pl/nowymerydian/userfiles/file/65677757687.pdf
    • https://ice-group.pl/userfiles/file/luwedaza.pdf
    • http://stringquartet.biz/web/images/fck/file/7012485797.pdf
    • http://freetds.net/userfiles/file/59770593996.pdf
    • https://ruxthai.com/ckfinder/userfiles/files/53828864193.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=growing+crucifix+orchids+in+brisbane
    • 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_off0000c873.bin
40b8bcbd437d6fd03cf75fcf3e78a327fecc8ad4066f44559fab71e200bf9324		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC873 17224 bytes
font_01_sfnt_off0000f4f5.bin
b0ee83469f87851fa166a6df5ecf6f3f6ecd51a8b70e98f5c7d97d73d988ba17		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF4F5 11076 bytes
font_02_sfnt_off00010e9f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10E9F 16792 bytes

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