Malicious PDF — malware analysis report

Static analysis result for SHA-256 ddf6685b941215b4…

MALICIOUS

PDF

103.7 KB Created: 2021-09-18 00:56:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 0bef6b9b89b09a40965a0c5f580f8866 SHA-1: 82d2d52306dce63b057e7f02696fb4c2455631f4 SHA-256: ddf6685b941215b40dbc7a866a80c1d43697a461b24f25dd010a51b7538c4a98
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable domains, indicating a link farm designed to obscure malicious destinations. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9877

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://izometal.net/mm/file/52676687206.pdf In PDF document text
    • http://softwarefactory.nl/images/file/95287083235.pdfIn PDF document text
    • http://www.alex-vasilkov.ru/images/wisdom/file/wevemodapesodowuba.pdfIn PDF document text
    • http://birdwatching.sk/media/file/pagidubujosepodu.pdfIn PDF document text
    • https://solidpractise.com/files/userfiles/file/daderilomifomubu.pdfIn PDF document text
    • http://www.ettermanenterprises.com/ckfinder/userfiles/files/79523095771.pdfIn PDF document text
    • http://luyutea.net/v15/Upload/file/2021916158317544.pdfIn PDF document text
    • https://radio-aurea.eu/files/file/gafama.pdfIn PDF document text
    • http://xn--80affcyoc0ac1f6a.xn--p1ai/admin/modules/ckeditor/ckfinder/userfiles/files/fumut.pdfIn PDF document text
    • http://www.parinet.fi/tiedostot/files/61399921876.pdfIn PDF document text
    • http://flamefitnessstudio.com/cewit/images/file/13436626915.pdfIn PDF document text
    • http://rqconsultores.com/userfiles/file/75524570179.pdfIn PDF document text
    • http://agilesolutions.in/uploads/pokavezanome.pdfIn PDF document text
    • http://czechnews.cz/userfiles/files/7495919948.pdfIn PDF document text
    • http://cupta.org/userfiles/files/20210907125326.pdfIn PDF document text
    • https://pr-dienst.ch/file/kakijozajamidifadubamab.pdfIn PDF document text
    • http://hamlineparkplaza.com/assets/amund/ckfinder/userfiles/files/52461488690.pdfIn PDF document text
    • https://al-farh-iq.com/upload/userfiles/file/15267425308.pdfIn PDF document text
    • https://biserica-izvorul-tamaduirii.ro/files/36450534357.pdfIn PDF document text
    • http://sanalights.com/admin/admin/uploadfiles/file/gesaxa.pdfIn PDF document text
    • https://catherinehourihan.art/wp-content/plugins/super-forms/uploads/php/files/af5c1ef6d4a23db2687fe6793c888fef/bajejebosovaferidopunopu.pdfIn PDF document text
    • http://unixsensor.com/uploads/files/202109130754104243.pdfIn PDF document text
    • http://techbis.pl/files/file/pofema.pdfIn PDF document text
    • https://allcondosales.rodeodrivecondosale.com/userfiles/files/zojekewepa.pdfIn PDF document text
    • http://koszyczarek.pl/userfiles/file/85233280909.pdfIn PDF document text
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/b2ae109a31a8eda0e72261b38eabeff4/fozakoxilukusowakoxexu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=400+robux+redeem+codePDF 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_off00012e49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E49 10304 bytes
SHA-256: 497c7ac3a6b06e488a4f4842a48e605adc8fce7f3496e85179c8f64c7d085b2f
font_01_sfnt_off00014579.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14579 19640 bytes
SHA-256: 75f881695cdac7434ffe7cc20b786ef17ca4654fab9fde114dfa892af1e5665a
font_02_sfnt_off000178f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x178F0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1