Malicious PDF — malware analysis report

Static analysis result for SHA-256 f420b6636835dde6…

MALICIOUS

PDF

78.0 KB Created: 2021-09-16 22:16:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 4678a84a24ba3e2b34ec7a5bdb7b2e74 SHA-1: c8593bcb3deb4df994fe210ea84e7038be0f0c18 SHA-256: f420b6636835dde646e53dd8996ab4cc1f93f7a17cbf24a67f60faa1ff5f7ae0
126 Risk Score

Malware Insights

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

The file was identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It contains numerous embedded URLs, many of which point to disposable domains and appear to form a link farm, a common tactic for distributing further malicious content. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic confirms this behavior.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://www.chubsorn.com/file/files/31605238091.pdf In PDF document text
    • https://homecareangels.ca/files/files/files/gofomogevetigapized.pdfIn PDF document text
    • http://gainliving.com/upload/editor/file/megijitabokebalob.pdfIn PDF document text
    • http://artpolyclinic.com/file/files/wutiveromanugegagu.pdfIn PDF document text
    • http://hysansam.com/fckeditor/userfiles/image/11422244529.pdfIn PDF document text
    • https://hagabb.ro/ckfinder/userfiles/files/51806626521.pdfIn PDF document text
    • https://dveropolis.ru/upload_picture/33329214475.pdfIn PDF document text
    • https://rocksoliddesigns.biz/userfiles/file/pupanus.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132612225e57---motigedozivajogibo.pdfIn PDF document text
    • http://xn--49s538bo8ux8c.net/userfiles/file/81804109493.pdfIn PDF document text
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/bb6e30759ef7e8066d2d1b5b9cc480ef/55297703784.pdfIn PDF document text
    • http://446888.top/userfiles/file/24423528555.pdfIn PDF document text
    • http://sgyscom.com/upload_fck/file/2021-9-4/20210904111111388220.pdfIn PDF document text
    • http://weorderfood.com/uploads/files/fexegejemoxeze.pdfIn PDF document text
    • http://oletrans.sk/editor_uploads/files/61040192714.pdfIn PDF document text
    • http://hytechplus.com/userfiles/file/25846827920.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/27413456183.pdfIn PDF document text
    • http://thuocamakong.net/userfiles/image/file/maleduvogenu.pdfIn PDF document text
    • https://segurodegranizo.ar/noticias/fckeditor/file/77237135034.pdfIn PDF document text
    • http://velapower.com/glwh/UploadFile/file/2021090811491273499.pdfIn PDF document text
    • http://mobilahomedesign.com/userfiles/files/kazusosolasoke.pdfIn PDF document text
    • http://cargologicru.com/sadm_files/7901453995.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=bip+for+androidPDF 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_off0000cec2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEC2 17808 bytes
SHA-256: 9b1ab0e4712fd9f3a50cb808d26a7d4e55c309f60aecfb240c5fa5833d75275a
font_01_sfnt_off0000fc56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC56 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001146d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1146D 10100 bytes
SHA-256: e571c1b393e45aa2fcd41579030af61b2bee408cea24e3821bb8074481a9ca99

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