Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f6b0056b53d7903…

MALICIOUS

PDF

70.8 KB Created: 2021-09-26 11:59:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 4b626dc60f75011647c5e19c93891988 SHA-1: f516e63ad69ab5f5bb18b06c3e406b6aec98fb17 SHA-256: 8f6b0056b53d7903f49068d6328cfd7f074d9843618ce881533256762c2dbf6b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file identified as malicious by ML classifiers and ClamAV. It contains a large number of embedded URLs, many of which point to potentially malicious domains, suggesting a link farm or redirection scheme. The PDF structure and embedded links indicate an attempt to direct users to external, potentially harmful content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9837

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://fulzugaskozpont.hu/files/paxavodaxilo.pdf In PDF document text
    • https://wcfkenzi.com/ckfinder/userfiles/files/jizovigubezegalojezid.pdfIn PDF document text
    • http://ljjxmining.com/uploadfile/file///2021090522075487.pdfIn PDF document text
    • http://on-video.com/movies/movie_data/file/bokexoga.pdfIn PDF document text
    • http://lctrading-gmbh.com/ckfinder/userfiles/files/8200934393.pdfIn PDF document text
    • http://hyosangjo.com/userfiles/file/20210912221816.pdfIn PDF document text
    • http://swhwsolution.it/ckeditor-ckfinder-integration/uploads/files/kamuzolarejuvu.pdfIn PDF document text
    • http://palaciodelosnavas.com/userfiles/file/pivuwopuzeviref.pdfIn PDF document text
    • https://coherence.cz/userfiles/file/75325616480.pdfIn PDF document text
    • http://www.aceitunasdelguadalhorce.es/ckfinder/userfiles/files/gepav.pdfIn PDF document text
    • http://www.johnrealestate.in/ckeditor-ckfinder-integration/uploads/files/pojoguxawefawavumodorob.pdfIn PDF document text
    • http://yesilderecine.com/admin/editor_resim/file/73205218310.pdfIn PDF document text
    • http://sin-hua.org/userfiles/rufesujabawa.pdfIn PDF document text
    • http://hoangduy.vn/vn/files/59065283104.pdfIn PDF document text
    • https://www.akilciilacdernegi.com/ckfinder/userfiles/files/98533304698.pdfIn PDF document text
    • https://bankubezpieczen.pl/userfiles/file/71793162075.pdfIn PDF document text
    • http://agro-norwa.pl/userfiles/file/moduvubotusipowoximo.pdfIn PDF document text
    • https://chiataiec.com/userfiles/Proj_Name/files/60921098512.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/iace8r1imvmip3kgro6bekd1v5/63592015403.pdfIn PDF document text
    • http://asijskepotraviny.cz/files/file/87158128986.pdfIn PDF document text
    • https://www.antoniopopolizio.it/ckfinder/userfiles/files/90720523483.pdfIn PDF document text
    • http://elektromig.pl/userfiles/file/xetelawuma.pdfIn PDF document text
    • http://logtech.cz/foto/Image/file/fuserofilazujonafetip.pdfIn PDF document text
    • http://mistral-paints.cz/userfiles/files/20429648123.pdfIn PDF document text
    • https://bulendengin.com/upload/ckfinder/files/90687139327.pdfIn PDF document text
    • https://bluetact.com/locktactyuma/userfiles/file/ludarodibozokodirumaxokuk.pdfIn PDF document text
    • http://romovi.net/sgi_userfiles/userfiles/files/xekazefafemizubogi.pdfIn PDF document text
    • https://china-glass-mosaic.com/userfiles/files/20210926_000000.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=gremlins+full+movie+onlinePDF 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_off0000b55d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB55D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cd74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD74 10320 bytes
SHA-256: 43bd8a4f9eb55f1629157e0e35c5da8e1da17100e527a780630beff83fa69437
font_02_sfnt_off0000e4b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4B1 16084 bytes
SHA-256: ab9546be08f209f8b8ceafcc3ca15638d3abebf5589dbff5426e37b791d64430