Malicious PDF — malware analysis report

Static analysis result for SHA-256 727539c44bbbf204…

MALICIOUS

PDF

80.1 KB Created: 2021-09-19 03:58:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 9ba5c3817c8bc36831c2ecebb0f4aa76 SHA-1: 48e8ddad264c2dc107484dc60db6cc10e8ec983b SHA-256: 727539c44bbbf2040353973dcf66ac5d1a7b0db818f5d19a9f6c0e30925fd947
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs, many of which are hosted on disposable domains and appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent. The primary function appears to be redirecting users to potentially malicious websites, likely for phishing or scam purposes, as suggested by the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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=best+game+ios+2021 PDF link annotation
    • http://german-ex.com/images/blog/file/80566129004.pdfIn PDF document text
    • https://khachsan295doson.vn/namthuan/images/news/files/wokimapugozakapon.pdfIn PDF document text
    • https://vonia.mikludava.lt/images/files/27395975808.pdfIn PDF document text
    • http://sunil.kr/uploadfile/fckeditor/file/59580889130.pdfIn PDF document text
    • https://tutorlookup.com/ckeditor/ckfinder/userfiles/files/xitagisegogudutexezemazo.pdfIn PDF document text
    • http://kramnyca.info/img/upload/editor/file/panagidi.pdfIn PDF document text
    • https://shellserva.nl/docs/Image/file/zimefonelopixi.pdfIn PDF document text
    • http://provia-events.de/pics/fotos/1/file/57634746377.pdfIn PDF document text
    • https://designmaster.in/scgtest/eec-new/codelibrary/ckeditor/ckfinder/userfiles/files/86189620004.pdfIn PDF document text
    • http://www.americaninvest.net/upls/files/xejabotogatuduvaronum.pdfIn PDF document text
    • http://kotrackusa.com/fckedit_file/file///20210908_0_25_49.pdfIn PDF document text
    • http://x-site.by/upload/editor/files/zumajisedixiliwetobavupe.pdfIn PDF document text
    • http://www.mamafoundation.cz/ckfinder/userfiles/files/64134250431.pdfIn PDF document text
    • http://hart-metale.pl/gimnazjum/userfiles/file/polilo.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_off0000d778.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD778 10548 bytes
SHA-256: fbf6796bff595915bac6283ffca52decad63a7ea5fb119f0ec7ee0067ca21775
font_01_sfnt_off0000efb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFB5 16932 bytes
SHA-256: 233da3b524b1b7d21cbfcc0cf52906dc0059ceb3f17178167951895ddc258f0c
font_02_sfnt_off00011b7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B7C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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