Malicious PDF — malware analysis report

Static analysis result for SHA-256 1e61c033dae72c48…

MALICIOUS

PDF

92.2 KB Created: 2021-10-04 19:21:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: b0a1ac0721fbe39b3c848c282219bde7 SHA-1: bba6ae35d8de32a0ca9d3932f708aca0caf1c35d SHA-256: 1e61c033dae72c48adc59a1d61c40fe803730ae2ba7dd598f46b237cdd311e78
134 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for exploiting vulnerabilities or redirecting users. The high number of external URIs, many pointing to disposable domains, suggests a link farm or phishing infrastructure. ClamAV and ML classifiers also flagged this sample as malicious, reinforcing the phishing and potential malware distribution intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9806

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://donauwell.at/userfiles/file/pubimatevitupoxupesukukog.pdf In PDF document text
    • http://yuha.be/_files/file/95884192542.pdfIn PDF document text
    • https://milkywayads.com/webroot/img/files/liratufowerejumijatume.pdfIn PDF document text
    • http://thanhcongtechtra.com/upload/files/63270620357.pdfIn PDF document text
    • http://www.slappedtogether.com/editoruploadfiles/file/11163262450.pdfIn PDF document text
    • http://golden-candies.ru/webroot/files/files/laradadirisubufurelosebin.pdfIn PDF document text
    • http://kfnmsz.com/upfolder/e/files/20210930225732.pdfIn PDF document text
    • http://custom-mugs-factory.com/uploadfile/files/86749725038.pdfIn PDF document text
    • https://vidaleve.ind.br/ckfinder/userfiles/files/xumamuxotejazolufekebel.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161421d191ef2d---jokasurolukuj.pdfIn PDF document text
    • http://tryinvest.eu/userfiles/files/mifogotaboxab.pdfIn PDF document text
    • https://drrajanmahtani.com/userfiles/files/89092613799.pdfIn PDF document text
    • http://itcck.org/upload/editor/file/95993549880.pdfIn PDF document text
    • http://www.saaegfpolis.org.br/ckfinder/userfiles/files/joronunobukokag.pdfIn PDF document text
    • https://handientu.vn/userfiles/file/89224070576.pdfIn PDF document text
    • https://dcimx.com/files/bopubaresexapafetaluki.pdfIn PDF document text
    • https://butzbacher.turnpoint.jo/app/webroot/upload/files/13920222525.pdfIn PDF document text
    • https://binarbaidrealestate.com/public_html/userfiles/file/75192936023.pdfIn PDF document text
    • http://studiolegalebisantis.it/userfiles/files/86139557899.pdfIn PDF document text
    • http://cathyourhair.nl/js/ckfinder/userfiles/files/nupekolurufewobed.pdfIn PDF document text
    • https://bibonatura.com/ckfinder/userfiles/files/demoturuzebipuj.pdfIn PDF document text
    • https://candica.pl/ckfinder/userfiles/files/81485879359.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/16142c54e6142d---bakoxiw.pdfIn PDF document text
    • http://ourpreferred.com/userfiles/files/xakusazusovukaxumofupiwop.pdfIn PDF document text
    • https://casabresciani.it/uploads/file/jusoropodumix.pdfIn PDF document text
    • http://incomingmakedonia.com/files/files/waxipeburororenek.pdfIn PDF document text
    • https://wronba.pl/uploads/wysiwyg/file/sepuxol.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=can+lice+survive+bleachPDF 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_off0000fe09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE09 10444 bytes
SHA-256: 14ca193d9b5e93bf0ff8656d04da63bd3214072a5ea95a204a71a18b8a0b7cc7
font_01_sfnt_off000115ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115AD 20364 bytes
SHA-256: d8051b907554b73b81ae212f57493ce6b26f266e86c6af0fa68a1a9a9a685dc2
font_02_sfnt_off00014b25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B25 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1