Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c7d22d573356998…

MALICIOUS

PDF

80.9 KB Created: 2021-09-24 06:56:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 6c63f24507612c30ba4742300efe7c5a SHA-1: 5a87c0ad96cf1c62fec975b9b54596f2e54bbbae SHA-256: 9c7d22d57335699890840518ad0bd58a736a6fa0bf75f5e70f33f875083da369
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of embedded URIs, many pointing to disposable domains, indicating a link farm designed to redirect users. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic confirms this behavior, suggesting the document's primary purpose is to lead users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://giaiphapthietke.vn/media/file/files/fazuzusano.pdf In PDF document text
    • http://nexxstep.nl/userfiles/file/gafepebabusolamusagerel.pdfIn PDF document text
    • http://yaan121.com/uploads/files/202109021131252120.pdfIn PDF document text
    • https://pre-www.bridge-college.com/uploaded/ckeditor/files/90610623048.pdfIn PDF document text
    • https://imihwa.com/uploads/image/20210908/files/20210908115458.pdfIn PDF document text
    • https://lazerom.pro/media/file/10743935408.pdfIn PDF document text
    • http://suphammamnon.org/uploads/files/bozovujopamo.pdfIn PDF document text
    • http://asja-doll.ru/userfiles/file/86316862790.pdfIn PDF document text
    • https://almentispharma.com/ckfinder/userfiles/files/10759070505.pdfIn PDF document text
    • http://stimatacasa.eu/userfiles/files/63170596423.pdfIn PDF document text
    • http://julianowka.pl/ckfinder/userfiles/files/47410966107.pdfIn PDF document text
    • https://ildiko-szepsegszalon.hu/userfiles/file/33624152083.pdfIn PDF document text
    • https://inprovitargentina.com/ckfinder/userfiles/files/73873448916.pdfIn PDF document text
    • http://duoctruongxuan.vn/userfiles/image/file/20183124117.pdfIn PDF document text
    • http://studionegrelli.it/userfiles/files/disezuki.pdfIn PDF document text
    • https://willes-gb.com/uploads/files/202109120301097831.pdfIn PDF document text
    • http://fruitsad.pl/images/file/lanozimumupuge.pdfIn PDF document text
    • http://tamlaproject.com/userData/board/file/19386682010.pdfIn PDF document text
    • http://hansungid.com/userfiles/file/42812960315.pdfIn PDF document text
    • http://niezapominajkowo.eu/userfiles/file/23609924077.pdfIn PDF document text
    • https://olgunbey.com/upload/ckfinder/files/puxukuxilususemusox.pdfIn PDF document text
    • http://www.perlodrink.com/documents/moveruzawetu.pdfIn PDF document text
    • http://libron.pl/fckupload/assets/file/72996902902.pdfIn PDF document text
    • http://ewhamd.net/upFiles/ckeditor/files/rinipelafinaj.pdfIn PDF document text
    • http://mrspk.com/ckfinder/userfiles/files/dawizopodezajad.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=tv+launcher+2PDF 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_off0000d8a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8A4 10096 bytes
SHA-256: 539282038032cfd8b97770d4946f8f2faea8a10d61d7b75240180f3c7a052cb6
font_01_sfnt_off0000ef24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF24 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010736.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10736 17880 bytes
SHA-256: b42fdba7a7a7c4cc815774c23167002920e3757089e9cfaf34c2d22443b9947c

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