Malicious PDF — malware analysis report

Static analysis result for SHA-256 e07a756d97d71479…

MALICIOUS

PDF

69.2 KB Created: 2021-09-25 13:26:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: bdf7b8129021bf9ffb5b827959d501de SHA-1: 0b9fd139a4cd91f882dd8681079bd386e239308d SHA-256: e07a756d97d71479b4304c0b4c119434cea68ca50ffeb1f5a8b1759321d21c86
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for exploiting PDF vulnerabilities or redirecting users. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates the document is part of a link farm, and the ML classifier and ClamAV detection strongly suggest malicious intent. The embedded JavaScript likely facilitates the redirection to the numerous unknown URLs found, contributing to a link farm strategy.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://naturalmis.com/userfiles/file/38322888157.pdf In PDF document text
    • http://guides2alpes.fr/uploads/file/dajutimexipiwegu.pdfIn PDF document text
    • https://sanipacific.com/attachment/file/mitunebelavizopuxafifa.pdfIn PDF document text
    • https://yukkumpulgroup2.com/contents/files/wonazakeg.pdfIn PDF document text
    • http://dangkydoanhnghiep.org/hinhanh_fckeditor/file/42446019980.pdfIn PDF document text
    • https://worldpigment.com/image/upload/File/68687361462.pdfIn PDF document text
    • http://www.nagsa.es/ckfinder/userfiles/files/70512700629.pdfIn PDF document text
    • http://www.thegrcinstitute.org/app/webroot/js/ckfinder/userfiles/files/simumikinenarifelus.pdfIn PDF document text
    • http://www.kizkulesikizogrenciyurdu.com/public/ckfinderuploads/files/fotifudekafenirolebifila.pdfIn PDF document text
    • http://les-dvorik.ru/userfiles/file/42952421928.pdfIn PDF document text
    • http://ilovehikari.com/uploads/files/mapoda.pdfIn PDF document text
    • http://abwplazaview.com/uploads/files/79203996050.pdfIn PDF document text
    • http://www.masozilina.sk/ckfinder/userfiles/files/wavekasikaxukijax.pdfIn PDF document text
    • http://watch62.ru/files/files/ditepabidirolavoliladila.pdfIn PDF document text
    • http://chaukitchen.com/uploads/files/magiviwomi.pdfIn PDF document text
    • http://hublihorse.com/uploads/userfiles/files/fijejurofofurugixenepu.pdfIn PDF document text
    • http://ventilyatsia-v-sochi.ru/ckfinder/userfiles/files/4441036464.pdfIn PDF document text
    • http://skia22.ru/pic/file/66437713629.pdfIn PDF document text
    • http://tecksco.com/upload/files/fokifetupufexebutujim.pdfIn PDF document text
    • https://istanajp.net/contents/files/74878855473.pdfIn PDF document text
    • http://abwcoliseum.com/uploads/files/pedejenurudowova.pdfIn PDF document text
    • http://winteringlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/91824604828.pdfIn PDF document text
    • http://studiosantese.eu/userfiles/files/tovipoxapube.pdfIn PDF document text
    • http://piazzademarini3ge.com/userfiles/files/luvelemulosisawel.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=hanuman+chalisa+page+downloadPDF 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_off0000af3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF3C 10940 bytes
SHA-256: b1a4494286816d53a562f7011a07a427a8de96ec232343f43148faf915aeb932
font_01_sfnt_off0000c828.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC828 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e03a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE03A 15632 bytes
SHA-256: 2bbe82a79c3746013c431bdff205f3b33a621ff67a8426d7caf33660036d016b

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