Malicious PDF — malware analysis report

Static analysis result for SHA-256 c445cf4a0376c3c1…

MALICIOUS

PDF

81.2 KB Created: 2021-09-12 06:37:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 8dc946f70f973a9d2fc4ac13e5b74234 SHA-1: 8b8af80407ed609c60fbcd34f6dce50ae3fa4843 SHA-256: c445cf4a0376c3c17761ce29da1b90d6eca722c4ca7ce1fa02b85f67e61c90c0
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, indicating it's designed to redirect users to potentially malicious websites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports the malicious nature by identifying a pattern of disposable hosting and link farming.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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 https://inwebjor.ru/uplcv?utm_term=farming+simulator+15+play+store PDF link annotation
    • https://lmcmanager.com/ckfinder/userfiles/files/39248743308.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/161391b8821198---dejiwivugorofa.pdfIn PDF document text
    • http://carszana.com/image/upload/File/javonalamimokuxikopabavik.pdfIn PDF document text
    • http://xn----7sbbbizu2bxaod.xn--p1ai/userfiles/file/ralizevememuwutojawevo.pdfIn PDF document text
    • https://sahyadrisevasanstha.in/userfiles/file/18193549715.pdfIn PDF document text
    • https://fotobolfestmeny.hu/mvc/userfiles/file/nojaluwuxifujozedojok.pdfIn PDF document text
    • https://nidi.mk/ckfinder/userfiles/files/wirig.pdfIn PDF document text
    • http://makrostal.pl/user_images/file/30856212126.pdfIn PDF document text
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/c181dcb16e988df1450e2eecd949e6cd/kuvaxasoketarujabutup.pdfIn PDF document text
    • http://jca-t.com/fck_image/file/solanitomasajesi.pdfIn PDF document text
    • http://captainkillmite.com/uploads/files/202109110110158182.pdfIn PDF document text
    • https://nezrenweb.com/calisma2/files/uploads/kixax.pdfIn PDF document text
    • http://geriatriccarenewjersey.com/userfiles/files/fuwifiderutebevuku.pdfIn PDF document text
    • http://deltools.com/userfiles/file/kovategikebodinoxusux.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/rifelodapivo.pdfIn PDF document text
    • http://spad.kr/userData/ebizro_board/file/77170884983.pdfIn PDF document text
    • http://nakamurasangyou.jp/app/webroot/uploads/files/zegukuxipofe.pdfIn PDF document text
    • http://xn--hy1bt45apoap01a.net/jangheung/userfiles/file/jawexamutobifidar.pdfIn PDF document text
    • https://sonntag-immobilien.lu/userfiles/files/damikovozojebugexukawi.pdfIn PDF document text
    • http://nowyhotelik.pl/userfiles/file/80703309436.pdfIn PDF document text
    • http://brucemayrockinstitute.com/assets/ckfinder/core/connector/php/uploads/files/vibiraxexi.pdfIn PDF document text
    • http://www.sun-green.eu/ckfinder/userfiles/files/wazirinokamaf.pdfIn PDF document text
    • http://pressvaluation.net/FCKeditor/editor/filemanager/connectors/userfiles/file/39861506264.pdfIn PDF document text
    • https://sfasg.jp/js/ckfinder/userfiles/files/pojawawejotigi.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_off0000da3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA3B 16664 bytes
SHA-256: a168b2160378ce948900620984d2bb57dfe8ead62353eebba9f2509025fdcb4d
font_01_sfnt_off0001058f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1058F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011da6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DA6 10972 bytes
SHA-256: 62509b53dc803f25598a9df30c031a2f17cb3592eeb22a3ebdcc70f5a3209413