Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a95f428fb0a3f4d…

MALICIOUS

PDF

81.4 KB Created: 2021-09-18 05:10:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 03f9a06e4e5cf77ad45f9f5adbf50f67 SHA-1: 79a13ecede9b6ca5f60c63184060b7273ba9c8b0 SHA-256: 4a95f428fb0a3f4d5f23795ba24205d484a15ac62055f2b3635ccaa506ca8923
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file containing embedded JavaScript, which is a common technique for executing malicious code. The PDF also hosts a large number of external URIs, many of which are on disposable domains, indicating a likely phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly support the malicious verdict.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://queure.ru/uplcv?utm_term=photo+moon+app+android
    • http://machinesupplier.cn/data/product/file/2021918_61057_705.pdf
    • https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/f9fa0a1ef4fc438435781bd070ed1b5b/nejoturidipuzugi.pdf
    • http://daiduongmetal.com/uploads/ckfinder/files/63973083746.pdf
    • http://crestviewshopping.abwingsmd.com/uploads/files/83143660153.pdf
    • http://absolutelyneon.com/userfiles/file/lejabewa.pdf
    • http://tobn56.com/UpFiles/file/85886068782.pdf
    • https://ecohort.biz/userfiles/files/xiniluwis.pdf
    • http://net-work.cz/data/file/40563620460.pdf
    • http://www.mananthavadynorbertines.org/www/js/ckfinder/userfiles/files/15984256774.pdf
    • http://terezmisszio.eu/files/file/zamoxenefufakuvoreres.pdf
    • http://newshop.jp/archive/file/wugoweziwubimaju.pdf
    • http://burningspearmarketplace.com/js/ckfinder/userfiles/files/2000039470.pdf
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137482963a88---xevikosugurisukajama.pdf
    • http://dfwarbitrator.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/55584743716.pdf
    • http://tinhdauvietnam.vn/upload/files/zefajanuluku.pdf
    • https://chowdhurytourism.com/ckfinder/userfiles/files/tepovariletoruzifaf.pdf
    • http://blackhorsesc.pl/userfiles/file/fexal.pdf
    • http://na-bytecek.cz/UserFiles/File/ruwor.pdf
    • https://csn-alliance.com/data/files/nipiwosenutodu.pdf
    • https://exihomes.com/userfiles/files/37865950982.pdf
    • https://vpmemorial.net/images/file/somawijenugovesiku.pdf
    • http://ros.by/ckfinder/userfiles/files/vodalatap.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dc36.bin
c4135f68fb0e7226d00452bcb258cd9fa9478d5da466574be3770ff5c79f89f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDC36 17412 bytes
font_01_sfnt_off00010944.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10944 16792 bytes
font_02_sfnt_off0001215b.bin
45b78045df27f2688dc382fb4a133af11b9c17419908983ce4a0fa923ae07074		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1215B 10312 bytes

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