Malicious PDF — malware analysis report

Static analysis result for SHA-256 626d73dbd3d6c668…

MALICIOUS

PDF

88.7 KB Created: 2021-09-18 08:51:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: b2a760e5bdb151c98a9c9d78434064f3 SHA-1: 3135bde4e5cafb3cf581bc7d57c689383e4988c6 SHA-256: 626d73dbd3d6c6689ad78e61f0355538bb98649dd658d139f0b99000f698248a
126 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious. It contains numerous embedded URLs, many pointing to domains associated with file hosting, and exhibits characteristics of a link farm. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically indicates a non-clustered link farm on disposable hosting, suggesting an attempt to lure users to potentially malicious content. No scripts were extracted, and the document body was unreadable, but the overall structure and URL distribution strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://ageddfjtjgrade.pretty-match.com/upload/files/66074706179.pdf In PDF document text
    • https://cyberbirddog.com/userfiles/files/sibotajato.pdfIn PDF document text
    • http://codemessaging.net/ckfinder/userfiles/files/39109477165.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/161360ea41ea6b---25408174154.pdfIn PDF document text
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/or0ptm3lc0laq6jtml1tgp3dbc/fevutazupanakamejozafam.pdfIn PDF document text
    • http://jorkurojus.com/userfiles/file/83753072848.pdfIn PDF document text
    • http://k12kos.com/ckfinder/userfiles/files/97350528843.pdfIn PDF document text
    • https://www.moxiclear.com.au/application/third_party/ckfinder/userfiles/files/9969839827.pdfIn PDF document text
    • http://gespk.com/userfiles/file/kirija.pdfIn PDF document text
    • http://ahcxdq.com/uploads/file/141453301096.pdfIn PDF document text
    • http://krakow4you.pl/krakow/files/pabelomeruparifejiduw.pdfIn PDF document text
    • https://theipbuzz.com/images/file/17817118403.pdfIn PDF document text
    • https://shreenathtechnologies.com/userfiles/file/70034253268.pdfIn PDF document text
    • https://hinaweb.com/upload/file/17771047372.pdfIn PDF document text
    • http://maximaviajes.com/FCKfiles/file/21201360486.pdfIn PDF document text
    • https://luathoanghuy.com/uploads/files/mewurotajuma.pdfIn PDF document text
    • https://mk-promotions.com/ckfinder/userfiles/files/14925412672.pdfIn PDF document text
    • https://zmiz.hr/userfiles/file/77927318892.pdfIn PDF document text
    • http://pttaccounting.com/userfiles/files/pezubaruwenewavirigox.pdfIn PDF document text
    • https://asmitahrgroup.com/ckfinder/userfiles/files/namawugadanalilaxo.pdfIn PDF document text
    • http://mingmitrcoffee.com/user_img/files/43980321309.pdfIn PDF document text
    • http://partnercable.com/files/zobifepabisiwexejuguv.pdfIn PDF document text
    • http://cdn.eagle.mn/uploads/userfiles/files/43830572314.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/161451bf179d36---7853827329.pdfIn PDF document text
    • https://mobilaide.com/upload/editor/file/vetizudikomov.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=online+android+tutorial+for+beginnersPDF 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_off0000e471.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE471 16296 bytes
SHA-256: 6abdad0a6b5e360b2c18ef505f3f9e897d656af0e2bbd51ec19edecf6c6227c0
font_01_sfnt_off00010e04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E04 17956 bytes
SHA-256: b59345682379faaceabc74c110a998da3fa9027f4f7f81930bc06db8128805c0
font_02_sfnt_off00013ce3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13CE3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1