Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1e5db4875d19a7e…

MALICIOUS

PDF

76.8 KB Created: 2021-09-13 12:16:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 4117e5b173ea69d8eb724a4b406ebf20 SHA-1: 5fcf1a9cdebdd9832d2f55e12e22fe3cc59f5344 SHA-256: a1e5db4875d19a7e6641301da910509c54a7d5bc0890bb1b5ed4a5c33c3ae1a3
134 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript 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 contains numerous external links, many of which point to unknown or potentially malicious domains, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 http://restavratorstvo.com/ckfinder/userfiles/files/38204104602.pdf In PDF document text
    • http://ameshamagazine.com/js/upload/files/zawuxovalus.pdfIn PDF document text
    • http://miass.realxenon.ru/uploads/files/gojusomited.pdfIn PDF document text
    • http://bluecars.pl/userfiles/file/79242576339.pdfIn PDF document text
    • http://gjbbang.com/userData/board/file/kozapeg.pdfIn PDF document text
    • http://formpart.com/upload/ckfinder/files/90943506682.pdfIn PDF document text
    • http://studioagronomoserragiotto.eu/userfiles/files/repolosujasonenolesidow.pdfIn PDF document text
    • http://pm-property.pl/userfiles/file/15164794763.pdfIn PDF document text
    • http://www.iece.in/userfiles/file/maraxisubetofigevutusor.pdfIn PDF document text
    • http://tipkeo.com/js/ckfinder/userfiles/files/turojege.pdfIn PDF document text
    • http://mamtomchabahai.com/uploads/files/files/37540407723.pdfIn PDF document text
    • http://de.ruben.pl/ckfinder/userfiles/files/99462821890.pdfIn PDF document text
    • http://www.gulbaharsigorta.com/contentData/file/66210119645.pdfIn PDF document text
    • http://nerezove-kuchyne.cz/UserFiles/File/pamugajikogidufixonad.pdfIn PDF document text
    • http://aal.tw/uploads/htmlupload/files/koxudarug.pdfIn PDF document text
    • http://internationalnetworksolutions.net/files/In PDF document text
    • https://alakharia.com/public_html/userfiles/file/75537244828.pdfIn PDF document text
    • http://mezon.jp/userfiles/file/63853394366.pdfIn PDF document text
    • https://ourlady-schools2.com/userfiles/files/81100545326.pdfIn PDF document text
    • https://lazerom.pro/media/file/87959346310.pdfIn PDF document text
    • http://jszl-rolls.com/filespath/files/20210901191329.pdfIn PDF document text
    • https://www.actionconstructionjax.com/wp-content/plugins/super-forms/uploads/php/files/895d49c9e9d6b43519570b8af69efe78/sajevigoginelunu.pdfIn PDF document text
    • http://ammk.sk/userfiles/file/39921330392.pdfIn PDF document text
    • http://bolt-go77.com/fckeditor/userfiles/file/94698881081.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=podcasts+for+androidPDF link annotation
    • http://s292376414.onlinehome.fr/datas/imgmail/file/91964798098.pdfIn PDF document text
    • 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_off0000cbde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBDE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e3f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3F0 16436 bytes
SHA-256: 53b3efd4013b19f86fb864e1d2388a02cd4ca13384ea54f03a08eecf071858c0
font_02_sfnt_off00010e25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E25 10292 bytes
SHA-256: 16bde9f73a2aa539971e339d2ca02b22c328aa7d53e7f9a795b7ab50e7a4ff01

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