Malicious PDF — malware analysis report

Static analysis result for SHA-256 e832555a87522145…

MALICIOUS

PDF

80.9 KB Created: 2021-09-15 22:11:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: fbda0ff6e55fe4ba327a22cec655a45f SHA-1: 2369d2788424f76982e1a079d2afdad43388f918 SHA-256: e832555a87522145408b1ec089b947fd5e8170b22d44c18d0e9f03268247b7f0
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, with heuristics indicating it functions as a link farm on disposable domains. The embedded URLs, despite some being marked benign, contribute to the overall suspicious nature. The document's purpose appears to be directing users to potentially malicious or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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 http://longarmquiltingacadamy.com/fckeditor/userfiles/file/18984567800.pdf In PDF document text
    • http://onlinetradeshow.ir/uploads/files/xevabudisutuwamekibuzikox.pdfIn PDF document text
    • https://limadelimon.com/images/file/97010077669.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/terogi.pdfIn PDF document text
    • http://mamtaniketan.com/userfiles/file/kolufikixitefifenubuxol.pdfIn PDF document text
    • https://angkoronetour.com/userfiles/file/26596558529.pdfIn PDF document text
    • http://shahnawazonline.com/uploads/files/xuxapadigesuwo.pdfIn PDF document text
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161377e273d9d5---4473013253.pdfIn PDF document text
    • https://rajakeempat.com/contents/files/59566392700.pdfIn PDF document text
    • https://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/61170d5c5244c50bfe0f1acf17bb9a5e/vezofogetidabetoni.pdfIn PDF document text
    • http://7profi.net/userfiles/file/gepukelogilurubeketoxop.pdfIn PDF document text
    • https://emailing-online.fr/uploads/userfiles/file/mixuxof.pdfIn PDF document text
    • http://szerecsen.hu/editor_up/40083385734.pdfIn PDF document text
    • http://avrig35.ro/uploads/fck_editor/file/58217084354.pdfIn PDF document text
    • http://sampoernastrategic.com/uploads/image/files/vuvoxiditutatuwazugudub.pdfIn PDF document text
    • https://bistakalikotenetwork.com/userfiles/file/wufela.pdfIn PDF document text
    • http://imcborivali.org/userfiles/file/56344781051.pdfIn PDF document text
    • http://teifsepahan.com/files/file/tulaj.pdfIn PDF document text
    • http://blueyee.com/upload/file/040431171300.pdfIn PDF document text
    • http://chinajnbt.com/images/upload/File/3725703557.pdfIn PDF document text
    • https://highrise.pl/file/58044869825.pdfIn PDF document text
    • https://jsptti.com/ckeditor/ckfinder/userfiles/files/72624642914.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=code+comparison+in+notepad%2B%2BPDF 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_off0000d81d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD81D 10660 bytes
SHA-256: e12873170b7e60964ed530300c8dffceb0730c1351783cf48aa7fcb4856837ac
font_01_sfnt_off0000f080.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF080 17856 bytes
SHA-256: b0fc72dae3991b5a80195494c83bd78d79552f0b71bb3051b9af6269cf4247b8
font_02_sfnt_off00011e89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E89 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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