Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3f4f20d5ad2c093…

MALICIOUS

PDF

80.5 KB Created: 2021-09-21 06:19:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 267d3c05b8c04597bab91ce382532e1e SHA-1: 90e61fd7106560fdf307bcef63c71b3f63e8ef65 SHA-256: b3f4f20d5ad2c0936f527e5da54fb25e957fbeb0a183a2e84eaf3be1bfb186b3
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains numerous embedded URLs pointing to potentially malicious domains, suggesting it functions as a link farm or redirects users to phishing or malware sites. The PDF structure and embedded content are consistent with a phishing lure or a downloader.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 https://philabc.ru/uplcv?utm_term=that+start+with+f PDF link annotation
    • http://sterenstein.ru/userfiles/file/dozotiso.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16134a2874f1bc---69413943549.pdfIn PDF document text
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/79f3636f2af3424e09cfa90d1c513c63/xofurib.pdfIn PDF document text
    • http://tipsclubcr.com/campannas/file/duforuragidinusike.pdfIn PDF document text
    • http://king-pro.com/userfiles/files/pezapesabewawoma.pdfIn PDF document text
    • http://brenderup.ro/mm/file/kafoxoreweritaxo.pdfIn PDF document text
    • https://bunexim.dascalita.ro/app/webroot/files/userfiles/files/93487835870.pdfIn PDF document text
    • https://kovtec.pl/eurostyl/photos/file/wubev.pdfIn PDF document text
    • http://www.jokilaaksonratsastajat.fi/file/birewadadidofunevikexog.pdfIn PDF document text
    • http://beveragesgs.com/userfiles/file/94509739472.pdfIn PDF document text
    • https://31app.com/userfiles/file/11815199994.pdfIn PDF document text
    • https://bya-ingenieria.com/ckfinder/userfiles/files/tisukesulogolerumavipotis.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/gudin.pdfIn PDF document text
    • https://jmbarrenetxea.soinuenea.eus/files/galeria/files/59770929663.pdfIn PDF document text
    • https://www.lsv-wittlage.de/ckfinder/userfiles/files/10029828322.pdfIn PDF document text
    • https://intekcanada.com/ckfinder/userfiles/files/majivokozaxawuwubovadik.pdfIn PDF document text
    • https://imaggu.com/ci/userfiles/files/kovesutomabu.pdfIn PDF document text
    • http://shopgraeagle.com/ckeditor/uploads/files/60118610112.pdfIn PDF document text
    • http://hainescentreasia.com/images/file/31406702107.pdfIn PDF document text
    • https://3eyamaichi.com/upload/ckfinder_temp/files/20210903122840.pdfIn PDF document text
    • http://khiensa.com/UserFiles/File/tetomafewiwifejap.pdfIn PDF document text
    • http://machin.kr/userData/board/file/10151559956.pdfIn PDF document text
    • https://gdaniec.com/upload/files/xagor.pdfIn PDF document text
    • 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_off0000db11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB11 16592 bytes
SHA-256: c4dbfee76446469cd9ff01870ba7dbec74af5e55ddd6b2848329bc9a2721be17
font_01_sfnt_off0001061f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1061F 9956 bytes
SHA-256: 363b077aeeed275117e46d241231fc5ad0e5343d0b8bc09636fa0d87b49e7055
font_02_sfnt_off00011c55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C55 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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