Malicious PDF — malware analysis report

Static analysis result for SHA-256 b25b954dc7ba5999…

MALICIOUS

PDF

69.7 KB Created: 2021-10-01 01:21:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: f5a83c8049eb1a8fadac378d7367eb76 SHA-1: 97c60b371add63ac323c3c14a34612979ade1a9e SHA-256: b25b954dc7ba59997aa8207058df276308766dafa005aa737db27de05aaf81cf
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm, suggesting a phishing or malware distribution campaign. The presence of external URIs and the ML classification strongly support a malicious attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://inwebjor.ru/uplcv?utm_term=watergirl+and+fireboy+unblocked+games PDF link annotation
    • http://businessplan-capalpha.eu/mbp/upload/images/images/upload/ckfinder/dolalorenum.pdfIn PDF document text
    • https://lacausedeslivres.com/userfiles/file/mujenevarivapexakife.pdfIn PDF document text
    • http://technimexvn.com/images/ckeditor/files/70930849218.pdfIn PDF document text
    • http://bhk-aindling.com/userfiles/files/videdawunadudebej.pdfIn PDF document text
    • https://nutstudio.it/userfiles/file/zajigezidesadixavesoluj.pdfIn PDF document text
    • http://infiniti.e-library.tw/uploads/files/xefusaviza.pdfIn PDF document text
    • http://vencedor.coop/images/admin/file/zopikunumirafo.pdfIn PDF document text
    • http://jyjjapan.jp/files/ckeditor/files/1765448954.pdfIn PDF document text
    • https://perfumes.dropship-tracking.com/userfiles/files/jemogazuwufijixinuko.pdfIn PDF document text
    • http://vinabomi.com/uploads/userfiles/file/kogurakuwotez.pdfIn PDF document text
    • http://archetipoingegneria.it/userfiles/files/2911835524.pdfIn PDF document text
    • http://highlevel.pl/userfiles/file/vekosu.pdfIn PDF document text
    • https://shevian.com/images/file/54637509385.pdfIn PDF document text
    • https://keongracun.org/contents/files/18624630230.pdfIn PDF document text
    • http://startent.ru/SITE/files/editor/file/70860854566.pdfIn PDF document text
    • https://remini.hu/userfiles/file/butirijegoxovevoza.pdfIn PDF document text
    • http://ubytovna-krumlov.cz/userfiles/file/rutasodasasomeferi.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1614cad1adbc54---28609274050.pdfIn PDF document text
    • http://iowatriallawyer.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/toviforika.pdfIn PDF document text
    • https://keralahappyjourney.com/ckfinder/userfiles/files/12893764335.pdfIn PDF document text
    • http://geologicatoscana.eu/userfiles/files/31738199270.pdfIn PDF document text
    • http://iseveranscopy.com/upload/editor/file/80157500552.pdfIn PDF document text
    • http://twfindia.in/userfiles/files/47148635704.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_off0000afda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFDA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c7ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7EC 15464 bytes
SHA-256: 39c1cda9ed38ebaa7ee08485b7a9829e90e20c52064e1c9bd8d73d9517e7ad61
font_02_sfnt_off0000ef2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF2B 11256 bytes
SHA-256: 917ad89d6b174508d4ae5ecae20b0b088bf6fd2d6b4a8557a76a2d5c21591d4c

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