Malicious PDF — malware analysis report

Static analysis result for SHA-256 993601e58caa5823…

MALICIOUS

PDF

74.9 KB Created: 2021-09-23 12:51:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 5c56a19d9b58d5f90f718392d2d65b8d SHA-1: f0b2dcde2b15f5d663c6cc940368a965548bcdaa SHA-256: 993601e58caa5823f8dbc51359bfe6ede39df2dd1175674c8bcdddf8ccffd5f8
142 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and numerous external URIs, many of which are part of a link farm hosted on disposable domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to trick users into downloading a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9827

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://theseadiaries.com/ckfinder/userfiles/files/79744602099.pdf In PDF document text
    • https://www.dogandemir.av.tr/paketler/ckfinder/dosyalar/files/93906721221.pdfIn PDF document text
    • http://ttmplus.com/userfiles/files/16972986861.pdfIn PDF document text
    • http://www.pacautomarketing.com/file/laranobi.pdfIn PDF document text
    • http://luxcottage.ru/stroykamen/userfiles/files/jaborazizi.pdfIn PDF document text
    • http://coniperfumes.cl/js/ckfinder/userfiles/files/ponisidozelazulo.pdfIn PDF document text
    • http://pandoraecza.com/genelresimler/file/peradirupuwewexo.pdfIn PDF document text
    • http://www.scsk12.org/policy/files/files/gimanadipamosaxejunowaf.pdfIn PDF document text
    • https://cvenhancer.com/wp-content/plugins/super-forms/uploads/php/files/f448116756609f7038a2dd00c7061f72/kupoge.pdfIn PDF document text
    • http://tele-fonika.pl/upload/file/30726675553.pdfIn PDF document text
    • http://fourfoods.com/images/files/27034913096.pdfIn PDF document text
    • http://sjmhospital.org/files/js/ckfinder/userfiles/files/bifuvugi.pdfIn PDF document text
    • http://qdsenfeng.com/data/files/85679498692.pdfIn PDF document text
    • http://bsp-oblspl.org/ckfinder/userfiles/files/wivutelevugotanatemes.pdfIn PDF document text
    • https://nslogisticservice.com/userfiles/files/48932933078.pdfIn PDF document text
    • http://www.sport-konyv.hu/userfiles/file/99617826639.pdfIn PDF document text
    • http://kleinschadenexperte.de/userfiles/file/xesatojiparerepuvid.pdfIn PDF document text
    • http://trunglamdecor.com/uploads/userfiles/file/joxoxilikulubutajete.pdfIn PDF document text
    • http://travelsi.ru/ckfinder/userfiles/files/podupomebibenufedegidexu.pdfIn PDF document text
    • http://80tner.netsociality.com/upload/files/jiwedikazinumupuzuj.pdfIn PDF document text
    • https://www.tri-or.fr/tri-or/ckfinder/userfilesfiles/44796881742.pdfIn PDF document text
    • https://cingenito.ca/upload/editor/file/fizuw.pdfIn PDF document text
    • https://eghamatyab.com/basefile/bainbookcom/files/96251628187.pdfIn PDF document text
    • http://khyljg.com/uploadfiles/files/pevabamisu.pdfIn PDF document text
    • https://tfsroanoke.com/home/tfs/public_html/new/ckfinder/userfiles/files/zakidiropagikurotosogeb.pdfIn PDF document text
    • https://rumusjitu.com/contents/files/zuvonaremebitesiwix.pdfIn PDF document text
    • http://cauthangdep24h.com/upload/files/dareri.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=photo+rescue+for+androidPDF 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_off0000c308.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC308 10628 bytes
SHA-256: db1e8d7f6b5a309faf7606babe130c0663e71b52409c03e888efa483d4f1508c
font_01_sfnt_off0000db55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB55 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f367.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF367 16772 bytes
SHA-256: a019284159edc998df35194bbbba4604ac304b376f58e40e8b2608e9abc13dcb