Malicious PDF — malware analysis report

Static analysis result for SHA-256 e1ffa461f43d896a…

MALICIOUS

PDF

84.0 KB Created: 2021-10-12 12:00:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: ca4f7ea1d8f9c3ded66b0c5145b8d5d2 SHA-1: 7641e9d17d7e8186cef71183703573171cbf89d5 SHA-256: e1ffa461f43d896a800b93ea4e95e1ab9e96b87ca22c2fa279010b33690fd80f
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to various domains, many of which are likely disposable, as indicated by the PDF_SEO_DISPOSABLE_LINK_FARM heuristic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. The document body is heavily obfuscated and unreadable, providing no direct content-based clues.

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 http://flexinform.com/hirlevel/file/fumapozawilukup.pdf In PDF document text
    • http://shepardinteriordesign.com/rw/upload/file/sebujudukapa.pdfIn PDF document text
    • http://www.blueoak.fr/image/file/tewuxonutaxejabij.pdfIn PDF document text
    • http://sxsasa.org/images_fck/file/1632223608.pdfIn PDF document text
    • http://wwsm-us.com/files/file/50421552808.pdfIn PDF document text
    • http://cn-polylysine.com/d/files/pelenivikoxaliluza.pdfIn PDF document text
    • http://rescue119.org/userfiles/file/80696386464.pdfIn PDF document text
    • http://vom-ragnaroek.de/uploads/file/9234819101.pdfIn PDF document text
    • https://rsvforum.com/userfiles/file/43672769774.pdfIn PDF document text
    • https://aihr-iadh.org/uploads/FCK_files/file/34749279350.pdfIn PDF document text
    • http://sinoscaform.com/upload/ckimg/files/202109200409593690.pdfIn PDF document text
    • http://msslink.ru/userfiles/files/80720508370.pdfIn PDF document text
    • https://ww150006.linebot.net/upfile/files/20211011122056.pdfIn PDF document text
    • http://patp1ryb.ru/media/file/parusogabe.pdfIn PDF document text
    • http://turagent007.ru/userfiles/file/sajutuseropudok.pdfIn PDF document text
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/l1o9ndrmldvdm57suieos80aq2/fiduw.pdfIn PDF document text
    • https://dorfadvertising.com/ckfinder/userfiles/files/lomuvosokebukotowivukop.pdfIn PDF document text
    • http://unsersohn.ch/images/file/68721902657.pdfIn PDF document text
    • http://amandatravel.com/userfiles/file/31537432035.pdfIn PDF document text
    • http://paradisetourkorea.com/FileData/ckfinder/files/20211010_9DDF4FBBAABBE664.pdfIn PDF document text
    • http://gniortho.com/files/Upload/file/nikimaf.pdfIn PDF document text
    • https://walnutcreekguide.com/wysiwygfiles/file/sosivedogezu.pdfIn PDF document text
    • https://stichtingech.org/ckfinder/userfiles/files/68904567238.pdfIn PDF document text
    • https://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/bc5b07e8b1f0191af226b78b8f20459c/56287688182.pdfIn PDF document text
    • http://chipublichouse.com/ckfinder/userfiles/files/kaleninitakemibetowoxamu.pdfIn PDF document text
    • http://jtour.vn/userfiles/file/310423571.pdfIn PDF document text
    • http://hndgyl.com/v15/Upload/file/202199326149575.pdfIn PDF document text
    • http://feedproxy.google.com/~r/MbOu/~3/1hHberoKktI/uplcv?utm_term=the+weirdest+people+in+the+world+pdfPDF 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_off0000e375.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE375 10484 bytes
SHA-256: ad9d5ea958b2a8a1121fa2ce633d49872da875d65e17d7d5b546ac1358741aed
font_01_sfnt_off0000fb41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB41 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011353.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11353 17832 bytes
SHA-256: 9023291a437484acd3865bc6b146cb2154bf4c9c4b20d3949f147db6fe8dbfcc