Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c5adee59d13312c…

MALICIOUS

PDF

75.5 KB Created: 2021-10-10 05:13:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 5fa56c4d524ab9ef90311270c18d7760 SHA-1: eb670a7deae22eaad582b767305a724e1521b57b SHA-256: 8c5adee59d13312c54ab62e2047c447b89ab3fd7bf21424ae4e870b84f9d4790
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, specifically identified as a phishing trojan by ClamAV. The presence of numerous embedded URLs, many pointing to disposable hosting and employing UTM parameters, suggests a link farm designed to redirect users to malicious content. While no scripts were explicitly extracted, the PDF structure and the nature of the URLs indicate an attempt to trick users into downloading further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 http://nbc.ua/design/pic/file/32369242225.pdf In PDF document text
    • https://myarchitect.es/ckfinder/userfiles/files/32458852294.pdfIn PDF document text
    • https://kingyao.com/uploadfiles/files/20211005_212159_7719.pdfIn PDF document text
    • https://doublehair.center/upload/ckfinder/files/ridenupirutopusizakefetov.pdfIn PDF document text
    • http://dostavkaturov.ru/files/file/gixolumabetifumajini.pdfIn PDF document text
    • https://gresathouse.com/wp-content/plugins/super-forms/uploads/php/files/1a83f7513766969a381e2f5377c4c4c4/mevukokokaturore.pdfIn PDF document text
    • http://ipea.kr/userData/board/file/40507240217.pdfIn PDF document text
    • http://lblussana.it/images/file/wuvep.pdfIn PDF document text
    • http://taispacedesign.com/upload/files/pudajewuketisub.pdfIn PDF document text
    • http://vcelari.naceradec.cz/includes/ckfinder/userfiles/files/30503731743.pdfIn PDF document text
    • https://autosaloncenter.com/uploads/file/83280455772.pdfIn PDF document text
    • https://mk-promotions.com/ckfinder/userfiles/files/1912647019.pdfIn PDF document text
    • http://kirakuramenandsushi.com/uploads/files/vifateramimexifugajo.pdfIn PDF document text
    • http://onmamtour.com/FileData/ckfinder/files/20210922_EBDC0F7F306305A9.pdfIn PDF document text
    • http://app0.linkeo.it/ckfinder/userfiles/files/lorevi.pdfIn PDF document text
    • http://sakuragiramenandsushi.com/uploads/files/xepodewawutuwunabajub.pdfIn PDF document text
    • http://dichvutheapec.com/upload/FCK/file/fogexazegir.pdfIn PDF document text
    • http://contua.org/userfiles/file/ragedi.pdfIn PDF document text
    • https://panoramamall.bg/ckeditor/ckfinder/userfiles/files/monasumin.pdfIn PDF document text
    • https://libyamonitor.com/sites/all/libraries/ckfinder/userfiles/files/tiponefu.pdfIn PDF document text
    • http://kelvista.lt/images/files/39537494024.pdfIn PDF document text
    • https://boucherienabli.com/uploads/FCK_files/file/pejunanaxo.pdfIn PDF document text
    • http://reguitti-engineering.it/userfiles/files/kijenojeki.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/1615661cc5621a---31144652928.pdfIn PDF document text
    • http://glendale.kopanramen.com/uploads/files/65881014216.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=alien+shooter+1+download+for+pcPDF 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_off0000c018.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC018 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d82f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD82F 10836 bytes
SHA-256: cf2f193a1fa4d1c548e55becf5a90ab60ce680dfb5de9f6c9948584c433a5a9e
font_02_sfnt_off0000f141.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF141 18728 bytes
SHA-256: 82cfebe574cfc46475143225d528b54a31901d1f1555caf848845913ffd834eb