Malicious PDF — malware analysis report

Static analysis result for SHA-256 c40a9d99ca2f57b7…

MALICIOUS

PDF

86.7 KB Created: 2021-09-20 02:28:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 5b4e55cfdac2aaf2821e4d2ef58fdd83 SHA-1: bc45d556cae5879312dc5843e7f201799b9ddb64 SHA-256: c40a9d99ca2f57b79528ac4cf7c8f7b236da0f0e8f90008c58e94888cde619c8
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which are hosted on disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is likely used to facilitate the redirection to these malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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://archism.ru/uplcv?utm_term=root+apk+for+android+11 PDF link annotation
    • http://ristorantebiscione.com/userfiles/files/58060599992.pdfIn PDF document text
    • http://isleford.com/filespath/files/20210907203055.pdfIn PDF document text
    • http://printific.com/images/contentimages/files/mofenosobolurorimelek.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139eb41818d2---wufolo.pdfIn PDF document text
    • http://mecateengenharia.com.br/ckfinder/userfiles/files/8815897081.pdfIn PDF document text
    • http://safetyassessmentsolutions.co.uk/ckfinder/userfiles/files/39067726577.pdfIn PDF document text
    • https://www.democratum.com/wp-content/plugins/super-forms/uploads/php/files/d45f12e020b5390f917c873f641adea5/52471148863.pdfIn PDF document text
    • http://tugrabilgisayar.net/resimler/files/nozivumafokoxugup.pdfIn PDF document text
    • http://technoauto.jp/js/upload/files/kinorabemizuxufexav.pdfIn PDF document text
    • http://zulassung4you.de/bilder/file/8816212733.pdfIn PDF document text
    • https://laznia-radom.pl/userfiles/file/liwawarejatawu.pdfIn PDF document text
    • http://bjyhyy.cn/filespath/files/20210908082454.pdfIn PDF document text
    • https://venus-forever.com/image/files/nujufodugimivorovo.pdfIn PDF document text
    • http://gidromall.ru/img/uploads/file/95711719218.pdfIn PDF document text
    • https://mimpishiosatu.com/contents/files/56320907712.pdfIn PDF document text
    • http://pattarasawat.com/ckfinder/userfiles/files/92148331330.pdfIn PDF document text
    • http://misbahelmudii.org/ckfinder/userfiles/files/nefiwikopenuxuf.pdfIn PDF document text
    • https://endobible.com/userfiles/file/rezevivevipenevanebegud.pdfIn PDF document text
    • http://tpdw.pl/userfiles/file/renusosafoposane.pdfIn PDF document text
    • http://kajo-frings.de/userfiles/file/bavevuwasavadofogag.pdfIn PDF document text
    • http://eva.am/files/95b137a87c1c656c.pdfIn PDF document text
    • https://delaneyllc.cfonewsletter.com/ckfinder/userfiles/files/6819536473.pdfIn PDF document text
    • http://cmtdental.com/upload/ckimg/files/2298751021.pdfIn PDF document text
    • http://el-system.jp/uploads/2012/files/30143503947.pdfIn PDF document text
    • http://legalinet.eu/userfiles/files/lowix.pdfIn PDF document text
    • https://pasarantogel2.com/contents/files/zifat.pdfIn PDF document text
    • https://pointwebhost.com/calisma2/files/uploads/29201458934.pdfIn PDF document text
    • http://agilesolutions.in/uploads/55196057369.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_off0000ebf3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBF3 19116 bytes
SHA-256: b844038a25d099eae3660cffe8e136343d52669c7428827f0f466b7cce23c0f7
font_01_sfnt_off00011d44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D44 10336 bytes
SHA-256: 130dcc7e26a581da458cea41fb910fe99d45751ac68753a551fcd304aafcd9e5
font_02_sfnt_off000134c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134C2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1