Malicious PDF — malware analysis report

Static analysis result for SHA-256 34184af4b23ff309…

MALICIOUS

PDF

95.2 KB Created: 2021-09-18 14:47:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 6bd0524d16662d753890ae3ce8d7fca8 SHA-1: c735a37479d5c0c8c03f3b45c0278fa02033daaf SHA-256: 34184af4b23ff309c66b494178027a2d403a6957cb5ab95374145311c102473e
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of embedded JavaScript and numerous external URIs, including a link farm on disposable hosting, suggests the PDF is designed to redirect users to malicious sites, likely for phishing or to download further payloads. The specific URL 'https://inwebjor.ru/uplcv?utm_term=blessing+and+honour+glory+and+power+lyrics' appears to be a primary redirection point.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9929

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://inwebjor.ru/uplcv?utm_term=blessing+and+honour+glory+and+power+lyrics PDF link annotation
    • http://kimandyoo.com/userfiles/file/50081892854.pdfIn PDF document text
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/16132e66eafddb---nowefasil.pdfIn PDF document text
    • https://clubberia.com/js/ckfinder/userfiles/files/wadafugixod.pdfIn PDF document text
    • https://www.potravinyav21.cz/ckfinder/userfiles/files/xufiwasususe.pdfIn PDF document text
    • http://www.elmundodelapiscina.com/ckfinder/userfiles/files/42370029601.pdfIn PDF document text
    • http://olech-rzeszow.pl/userfiles/file/duposopewubi.pdfIn PDF document text
    • https://verlauf-ekb.ru/admin/ckfinder/userfiles/files/momumukufepa.pdfIn PDF document text
    • http://pi-consulting.ch/download/63721173871.pdfIn PDF document text
    • http://wakabaeducation.com/userfiles/file/81008621938.pdfIn PDF document text
    • http://h-st.nl/bestanden/files/zogujubisa.pdfIn PDF document text
    • http://levant-tekstil.com/other_files/File/92138645534.pdfIn PDF document text
    • http://wxeina.com/userfiles/files/17969704960.pdfIn PDF document text
    • https://wroclawmodelshow.pl/ckfinder/userfiles/files/30204058101.pdfIn PDF document text
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/vcdqsa0gbhqusbu8ts9hohjmeg/witasugi.pdfIn PDF document text
    • https://www.xtremefitness.com.au/application/third_party/ckfinder/userfiles/files/91658378742.pdfIn PDF document text
    • http://liubeauty.com/luutru/files/pididefatujakulojaxojoduw.pdfIn PDF document text
    • https://securitydm.com/slicice/file/70477027251.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/25326389357.pdfIn PDF document text
    • http://888chji.com/userfiles/files/dupirapodozavoziju.pdfIn PDF document text
    • http://www.southpointinstitutehowrah.com/admin/uploads/file/zodububujososojefozaj.pdfIn PDF document text
    • http://laureysnv.be/uploads/files/werezuzakopusesifutivot.pdfIn PDF document text
    • https://aparcaderoshaddaichile.cl/uploads/images/files/pavagakepetofob.pdfIn PDF document text
    • http://tomei4x4.jp/js/upload/files/zekekifokamokemod.pdfIn PDF document text
    • https://mlbcsimleague.com/ckfinder/userfiles/files/volugutetuwojiso.pdfIn PDF document text
    • http://rickgrisolia.com/userfiles/files/9373276020.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_off000100cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100CD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000118df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118DF 22788 bytes
SHA-256: 6ad252b6ca33ae579614c8b1245e92ca61bb912cdf8de1e39a031aa6f68ee4c4
font_02_sfnt_off0001554f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1554F 11048 bytes
SHA-256: 09b361fa1b182e338590c681c1dc24610247e7221427951632e367c049e33a39