Malicious PDF — malware analysis report

Static analysis result for SHA-256 97bd0f83f9fca077…

MALICIOUS

PDF

79.3 KB Created: 2021-09-19 05:54:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 89c0a3900a55129fdc993d83a4dd9609 SHA-1: 4fc4bcd679e6d08f78b91eb5f39d79dbd949ae89 SHA-256: 97bd0f83f9fca07746e3b1026a43ba9342c2d0210eafc736b4006e77a22729c2
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The ML classifier and ClamAV detection strongly indicate malicious intent. The PDF contains numerous embedded URLs pointing to a link farm, a common tactic for phishing or distributing further malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically identifies this pattern, suggesting the PDF's primary purpose is to redirect users through a network of disposable domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://gilendor.cz/userfiles/file/digewapa.pdf In PDF document text
    • http://sithome.com/upfiles/file/20210909104518.pdfIn PDF document text
    • http://livelyway.com/ckfinder/userfiles/files/33359887103.pdfIn PDF document text
    • http://thietbiytedaibao.com/media/files/fugodada.pdfIn PDF document text
    • https://hlj-vibration.com/uploads/image/20210915/files/20210915140539.pdfIn PDF document text
    • http://mirutte.com/newsfiles/files/vegivale.pdfIn PDF document text
    • http://nawoo.net/userData/board/file/rorejago.pdfIn PDF document text
    • http://veszpremkosar.hu/_user/file/97045320548.pdfIn PDF document text
    • http://dongphat.net/upload/files/96910111684.pdfIn PDF document text
    • http://eskuvoiiranytu.hu/blog/file/39888073162.pdfIn PDF document text
    • http://naturalwonders.com/uploads/files/27565229970.pdfIn PDF document text
    • http://monterroso-construpuntos.com/campannas/file/vopukokodenixu.pdfIn PDF document text
    • http://brighterhealthcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/iugsdcb9b9gug8atgl76fd82cn/60133178898.pdfIn PDF document text
    • https://ijaetis.org/ckfinder/userfiles/files/wedigupovikepevataweluve.pdfIn PDF document text
    • http://hkacca.com/userfiles/lemutiloforedubowuna.pdfIn PDF document text
    • https://cemb.ca/upload/editor/file/xububexu.pdfIn PDF document text
    • http://dancephoto.ru/userfiles/files/81680663548.pdfIn PDF document text
    • http://www.pranabkumar.com/fckimages/file/tenumafilupix.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/1613562e39a97e---37998749355.pdfIn PDF document text
    • http://x04ydivan.ru/userfiles/file/36062118032.pdfIn PDF document text
    • http://mariopresto.pl/userfiles/file/4049308527.pdfIn PDF document text
    • http://beetsom.com/PROGRAM_FCKeditor_UserFiles/file/61451127461467141c3b79.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=live+background+iphone+sePDF 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_off0000cf42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF42 11004 bytes
SHA-256: 25309b3fb318f5d93c2bc3f442060095cf3750d2ff07bc19dea7fed66d66ba9e
font_01_sfnt_off0000e85e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE85E 18304 bytes
SHA-256: e824b185d268d3ff8f87bc69d9a150d48919be36d61cb7b98a878a47146684d1
font_02_sfnt_off00011801.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11801 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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