Malicious PDF — malware analysis report

Static analysis result for SHA-256 fcdf8792fddcb4b6…

MALICIOUS

PDF

82.7 KB Created: 2021-09-13 06:49:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 98689c53e3d25bce4ca5da563eab7b7a SHA-1: b64cfc93fdf0c0e8b49845d6d78d586c83be27d6 SHA-256: fcdf8792fddcb4b6d9794aa8cde66bba59775f6299c0c3c6380f9436c70fe61f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The embedded URL and the PDF SEO Disposable Link Farm heuristic suggest a phishing or malicious download lure. Although no scripts were explicitly extracted, the PDF structure and heuristics indicate it's designed to trick users into clicking links that lead to malware or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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://whitepalacegrill.com/userfiles/jekaviva.pdf In PDF document text
    • http://przychodnia-felinskiego.pl/uploads/editor/file/wazalikomijisotosojum.pdfIn PDF document text
    • https://bodykneadstherapy.com.au/ckfinder/userfiles/files/91461479336.pdfIn PDF document text
    • https://chorland-dining.com/webroot/editor-uploads/files/pumoketagogurilakexosepam.pdfIn PDF document text
    • https://trystsalonri.com/images/file/nataxutapipamogasi.pdfIn PDF document text
    • https://jooli.ru/ckfinder/userfiles/files/73351125260.pdfIn PDF document text
    • http://broadviewlibrary.org/uploaded_bvlib/file/darolel.pdfIn PDF document text
    • http://fukaofoods.tw/uploads/files/202109130345075553.pdfIn PDF document text
    • http://kashima.cc/userfiles/file/33150236073.pdfIn PDF document text
    • http://emiem.pl/public/upload/ckfinder/userfiles/files/dimekaf.pdfIn PDF document text
    • http://arucax.am/user_images/file/tefelejixulupa.pdfIn PDF document text
    • http://www.rosabrockenhaus.ch/ckfinder/userfiles/files/51995346043.pdfIn PDF document text
    • http://provia-events.de/pics/fotos/1/file/nibedufitutofe.pdfIn PDF document text
    • https://investmentskillsgroup.com/images/userfiles/file/11446520340.pdfIn PDF document text
    • http://ip-malkov.ru/uploads/files/99287076601.pdfIn PDF document text
    • http://sparan-art.ru/ckfinder/userfiles/files/verarejodarelamu.pdfIn PDF document text
    • https://laundrybyconrads.com/nbloom/fckuploads/file/petabida.pdfIn PDF document text
    • http://taigesw.com/upload/files/ketamijejuzelebapununoreb.pdfIn PDF document text
    • http://wwstationery.com/files/file/jiwojetuvepatexaxevela.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131b8d62c509---46125845148.pdfIn PDF document text
    • http://nwatchonline.org/userfiles/file/mikud.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a8af4acea4---29117676248.pdfIn PDF document text
    • http://emanuelarombiarchitetto.eu/userfiles/files/34138292804.pdfIn PDF document text
    • https://hainutedecopii.eu/ckfinder/userfiles/files/80583194573.pdfIn PDF document text
    • http://bronnicy.inhome360.ru/admin/ckfinder/userfiles/files/68117977254.pdfIn PDF document text
    • https://airflow-skateboards.com/userfiles/files/32391012127.pdfIn PDF document text
    • https://tsegypt.com/file/nerakivog.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=download+picsart+crackPDF link annotation
    • 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_off0000ddbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDBE 10556 bytes
SHA-256: 0ab1e27ead9244e635803d0d51e8390d6116a7654b947fbd8d2da31b03c3a1ee
font_01_sfnt_off0000f5f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5F5 17960 bytes
SHA-256: e83e083d0c8a48f5f4ee04ca78e4399f6ed74af94293910ec026169ec1ba01af
font_02_sfnt_off000124a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124A6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1