Malicious PDF — malware analysis report

Static analysis result for SHA-256 754bb08953593969…

MALICIOUS

PDF

79.4 KB Created: 2021-09-23 06:58:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: b535a34822ce92cf51379bf1f1d030a8 SHA-1: cb195756cc00ddb16f82f040758ac5932cfbacd5 SHA-256: 754bb08953593969e6e603153482247d09e09b5ea3105d78e223f7ffc6eb5d55
126 Risk Score

Malware Insights

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

This PDF was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristics indicate it functions as a link farm, directing users to numerous external URLs, some of which are hosted on disposable domains. This behavior is consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://mk-sito.it/uploads/file/12970369064.pdf In PDF document text
    • https://vitanov.rs/files/11871575698.pdfIn PDF document text
    • http://chamdure.com/DATA/files/kodaxus.pdfIn PDF document text
    • http://saikunghouse.hk/userfiles/80899985511.pdfIn PDF document text
    • http://www.nbc.com.vn/ckfinder/userfiles/files/19877619213.pdfIn PDF document text
    • http://wksystems.net/HotelEstimator/userfiles/file/sotijikelebigotiki.pdfIn PDF document text
    • http://prttour.ca/FileData/ckfinder/files/20210913_EABFDBD13B217BAC.pdfIn PDF document text
    • http://omnoiptv.com/outscapes/admin/ckeditor/uploads/ck/files/4835171146.pdfIn PDF document text
    • http://christmaslandint.com/userfiles/1272815309.pdfIn PDF document text
    • http://go-pxl.com/uploads/files/95921557403.pdfIn PDF document text
    • http://eskuvoiiranytu.hu/blog/file/70503066623.pdfIn PDF document text
    • http://tbeaindia.com/userfiles/file/46869160302.pdfIn PDF document text
    • https://www.hasmow.com.au/application/third_party/ckfinder/userfiles/files/pamaxidapezij.pdfIn PDF document text
    • http://irollee.com/userfiles/file/wejaro.pdfIn PDF document text
    • http://kiko168.com/UploadFile/file/20210922201250327.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c6ad2128fe---27481377477.pdfIn PDF document text
    • https://feniks9.ru/ckfinder/userfiles/files/lobuxolopivim.pdfIn PDF document text
    • http://elazentrale.de/images/uploaded/file/jolaruginazupiw.pdfIn PDF document text
    • http://odnoklassniki-files.ru/images/uploads/files/65357398326.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=my+all+guitar+chordsPDF 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_off0000d414.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD414 10620 bytes
SHA-256: 25b8f10dde02fbf898fe1bfd6fbb320fa295494bd8d718c020200f3cca571c3c
font_01_sfnt_off0000ec54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC54 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010466.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10466 16924 bytes
SHA-256: ec357da99916ad7cac2d3de770ba2f4994b1ee1d4d81cefdb96fe53e48d83fa4

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