Malicious PDF — malware analysis report

Static analysis result for SHA-256 aff025628f59ef72…

MALICIOUS

PDF

85.9 KB Created: 2021-09-17 18:06:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: ffd3396bb3bdc3ef40b0e6369fe537b8 SHA-1: 19186868fd4dfd7a1b1df167459ec0800171d056 SHA-256: aff025628f59ef724f9fdf455403107f85027282a7642cedd6eb19738032bd35
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or malware distribution intent. The presence of numerous external links, many pointing to disposable domains, suggests a link farm designed to redirect users to malicious content. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://expobar.vn/app/webroot/files/images/pages/files/68518988447.pdf In PDF document text
    • http://okna-stv.ru/userfiles/files/96494342567.pdfIn PDF document text
    • http://ngoinvest.com/uploads/ckfinder/files/33961695794.pdfIn PDF document text
    • https://consultemergingmarkets.cubsindia.com/files/62407846609.pdfIn PDF document text
    • http://domusanna.it/userfiles/files/98595484332.pdfIn PDF document text
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/c2473c848c4be813b593cb6990b57074/21167865605.pdfIn PDF document text
    • http://dakmoto.cz/obrazky/file/2831309892.pdfIn PDF document text
    • http://swaptoys.org/ckeditor/uploads/files/wekuvaxogoximelebiw.pdfIn PDF document text
    • http://bluebiz.kr/userData/board/file/wodumub.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ee015a8ae9---lusinema.pdfIn PDF document text
    • http://ozgu-yapi.com/firma/files/nifedipaw.pdfIn PDF document text
    • https://johanbjerke.se/userfiles/file/foxojigaxapajabofatenemi.pdfIn PDF document text
    • http://domplus.su/userfiles/files/34310983582.pdfIn PDF document text
    • http://asesoriazabalburu.org/azaba/files/file/dosepadiv.pdfIn PDF document text
    • https://bosingels.nl/ckfinder/userfiles/files/58427627439.pdfIn PDF document text
    • http://rallyteamwalraven.nl/file/darajumanakat.pdfIn PDF document text
    • http://bancasemecanino.com/userfiles/files/99545088394.pdfIn PDF document text
    • http://hotel-ambassador-nice.com/upload/files/duvewugivefosepuj.pdfIn PDF document text
    • http://rrarental.org/upload/file/kawuroxinatatitovunaz.pdfIn PDF document text
    • http://mu-rrrc.com/userfiles/file/gerabuvijavupe.pdfIn PDF document text
    • http://cerrutistudio.eu/userfiles/files/zakebawam.pdfIn PDF document text
    • https://pharmnet.cz/ckfiles/files/files/josozuzutuvelidasu.pdfIn PDF document text
    • https://sibconsulting.com/contents/files/fafuku.pdfIn PDF document text
    • http://mishor-uvk.com/uploads/files/dijomoke.pdfIn PDF document text
    • http://korvet-sp.ru/userfiles/file/686295688.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=how+to+recover+formatted+contacts+from+android+phonePDF 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_off0000e9d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9D0 10980 bytes
SHA-256: 3216f297326ec0b3939dc8f57ee3b94a5c3d2170b1ed888c980ee8adc7d4c0d6
font_01_sfnt_off00010322.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10322 17620 bytes
SHA-256: 42b2867cbc082020ae33ff61701f2911f9699afa0185f37d2ff833bd0cc42487
font_02_sfnt_off00013133.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13133 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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