Malicious PDF — malware analysis report

Static analysis result for SHA-256 322ad879b76d4827…

MALICIOUS

PDF

72.5 KB Created: 2021-09-10 14:12:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: e0702524c7a2803966d442be14a794cb SHA-1: 91f4980570aa5f9b77c4ee6b147a935bcdb2fa27 SHA-256: 322ad879b76d48273b530e90abd8b283820a0f6b0496bae9b590d7a8aa450d1a
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code within documents. The sample also exhibits characteristics of a link farm, with numerous external URIs pointing to disposable hosting, suggesting an attempt to redirect users to malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to deliver a secondary payload or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://dlugopis.kbo.pl/ckfinder/userfiles/files/jowisafewujadeki.pdf In PDF document text
    • https://motty-etai-sharon.com/files/files/jides.pdfIn PDF document text
    • http://www.mostenpo.jp/userfiles/files/sofum.pdfIn PDF document text
    • http://partnerplus30.ru/images/fornews/files/ropamoverimowoxosasupul.pdfIn PDF document text
    • https://oldd.adventurenetbg.com/userfiles/file/nosejudesufonedupugexor.pdfIn PDF document text
    • https://everywheregenes.com/uploadfile/qu26_qu106_com/files/tatazanamulobovixuvovozag.pdfIn PDF document text
    • https://salvamontbihor.ro/app/webroot/files/userfiles/files/migusidekut.pdfIn PDF document text
    • http://sasolution.kr/userfiles/file/58695838654.pdfIn PDF document text
    • http://shendaoguoji.com/data/attachment/file/xerifugagupobemuwutomezu.pdfIn PDF document text
    • http://cjmfgx.morefriendship.com/upload/files/28654050736.pdfIn PDF document text
    • https://mygamedaysports.com/wp-content/plugins/super-forms/uploads/php/files/98fe081f735134dbcaa382f583fd6106/poviwedub.pdfIn PDF document text
    • https://lawrenceyezersky.com/userfiles/file/66443088864.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/mcr2dlfqi6fhd38n673g3jqq8j/lidukojaxori.pdfIn PDF document text
    • http://chelseafoodmart.com/uploads/files/pivazofenu.pdfIn PDF document text
    • http://hoangminhsaigon.vn/@dmin/js/ckfinder/userfiles/files/77185878894.pdfIn PDF document text
    • http://ryanoomen.nl/uploadimages/files/kufegej.pdfIn PDF document text
    • https://sunnyvale.com/wysiwygfiles/file/51830125588.pdfIn PDF document text
    • http://abbeytraining.net/userfiles/file/43516057940.pdfIn PDF document text
    • https://banghenails.com/upload/file/jijapufilawimiseporo.pdfIn PDF document text
    • http://honeycontacts.com/uploades/userfiles/file/36769779397.pdfIn PDF document text
    • https://gtnet-engine.com/ckfinder/userfiles/files/pilototeforojulomena.pdfIn PDF document text
    • http://talleresjpg.es/img/file/32033456665.pdfIn PDF document text
    • https://confeccionesruiz.cl/UserFiles/File/97243949144.pdfIn PDF document text
    • https://0286869143.com/editor_images/files/tafisenotisitudesasez.pdfIn PDF document text
    • https://igruppe.no/ckfinder/userfiles/files/63730578352.pdfIn PDF document text
    • http://studiodispirito.it/userfiles/file/xivivulukojuxudaje.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=majesty+fantasy+kingdom+apkPDF 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_off0000b8fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB8FC 11024 bytes
SHA-256: d3cd2a2c5e1e4b8be6bc94881a3e1045bc6438bdc6e1915617a5698f085a089d
font_01_sfnt_off0000d272.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD272 16280 bytes
SHA-256: 3dee1c3552d1db3beda6d35aa810b2b8b61233beee362f88e71379adf39480f9
font_02_sfnt_off0000fc83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC83 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1