Malicious PDF — malware analysis report

Static analysis result for SHA-256 dcb23fd2d842e047…

MALICIOUS

PDF

83.8 KB Created: 2021-09-20 12:18:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: e8aba86b49f943d181b1bcf9a687985e SHA-1: c115fab2b1e4e41aecc736b8c2f3d2987b67592f SHA-256: dcb23fd2d842e047fecfbb802e353e69bfd7e1ca1142cd8ba0f2f045815416e4
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link T1059.007 JavaScript

The PDF document was flagged by ML classifiers and ClamAV as malicious, exhibiting characteristics of a phishing or malware delivery scheme. The 'Fake CAPTCHA' heuristic indicates the document aims to deceive users into performing an action, likely to download a payload or visit a malicious site. While no scripts were explicitly extracted, the presence of numerous disposable links and the overall structure suggest an attempt to lure users into a malicious download or exploit chain.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • 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://apsara.ru/userfiles/file/21829002642.pdf In PDF document text
    • https://reviewz.eu/app/webroot/files/userfiles/files/bujavukuwilukafu.pdfIn PDF document text
    • http://energcomb.net/cms_enercomb/sgi_userfiles/userfiles/files/25869560081.pdfIn PDF document text
    • http://bentleyplemtech.ru/userfiles/file/40941034243.pdfIn PDF document text
    • http://baigeleather.com/userfiles/file/zakaret.pdfIn PDF document text
    • https://canionglobal.com/FCKeditor/file/28492896668.pdfIn PDF document text
    • http://bolt.fo/public_html/userfiles/files/60583943287.pdfIn PDF document text
    • http://greenvisioninternational.gm/userfiles/file/76900193794.pdfIn PDF document text
    • http://baloneacessorios.com/_upload/file///pigafugilasevuvoginokuz.pdfIn PDF document text
    • http://vongtaygiay.net/media/ftp/file/5425200088.pdfIn PDF document text
    • http://kiapelhrimov.cz/UserFiles/File/42794148361.pdfIn PDF document text
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d320061e58---40182145337.pdfIn PDF document text
    • https://morabia.fi/images/file/vejexapuregajitarevadon.pdfIn PDF document text
    • https://kstraders.com/userfiles/file/maganipuzajum.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140949c91aa3---zinolekufari.pdfIn PDF document text
    • https://lostfoundglobal.com/userfiles/file/jerejuf.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/fedeme.pdfIn PDF document text
    • https://zebcom.in/userfiles/file/pusurunadinesewe.pdfIn PDF document text
    • http://massarentearchitettura.com/userfiles/files/27869993374.pdfIn PDF document text
    • http://be-now.pl/userfiles/file/49251384352.pdfIn PDF document text
    • http://matsonconstruction.net/userfiles/file/21088917633.pdfIn PDF document text
    • https://evergreencans.com/userfiles/file/89812487471.pdfIn PDF document text
    • http://partnerplus30.ru/images/fornews/files/ninenoxarevovivube.pdfIn PDF document text
    • https://khabul.mn/mmpa/userfiles/files/zisewajabonobuwaf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=gta+v+download+without+human+verificationPDF 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_off0000e046.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE046 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f85d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF85D 10864 bytes
SHA-256: 6cc227f8b7cb9c73ce1d15fe05b5687598218c106a2158a34bacb25a37e871b3
font_02_sfnt_off0001114c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1114C 18620 bytes
SHA-256: 77c011cf8749da844006f72593da9dc2d6b807c05dd2e2ecd8d9f78304a0b1fe