Malicious PDF — malware analysis report

Static analysis result for SHA-256 f76308af4b56566e…

MALICIOUS

PDF

83.3 KB Created: 2021-09-16 21:28:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 042a5a4b5d52ed56703afefb78af620f SHA-1: 62d276eda85059741eea4e245571977ee44b13c4 SHA-256: f76308af4b56566ed88f90b3535509271d81303d325fbbafc783230ac3a04de1
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are part of a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to trick users into downloading malware via the deceptive links. The embedded JavaScript may be responsible for initiating the download or redirecting the user to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 https://wastran.ru/uplcv?utm_term=dream+league+2018+obb+file PDF link annotation
    • https://optical-axis.com/uploads/files/202109031400286043.pdfIn PDF document text
    • http://rspon.pl/images/wyswig_images/file/18016063018.pdfIn PDF document text
    • https://digireg.org/upload/22100925244.pdfIn PDF document text
    • https://gameclub.by/uploads/files/kanefewikopuki.pdfIn PDF document text
    • http://sangsangins.com/upload/upload/file/lidexuxixomot.pdfIn PDF document text
    • https://journeywithmypet.com/ckfinder/userfiles/files/52078478160.pdfIn PDF document text
    • http://shinies.ru/img/lib/file/sitinoxetadabem.pdfIn PDF document text
    • https://khonggiansangtao.com/platformecom/img/upload/file/72508868697.pdfIn PDF document text
    • http://hanarotalk.com/userfiles/file///joboregazeje.pdfIn PDF document text
    • http://www2.grupoksl.com.br/js/ckfinder/userfiles/files/miraw.pdfIn PDF document text
    • http://tuvanluatdanang.com/upload/ck/files/dudevukurutuxabagudimuka.pdfIn PDF document text
    • http://career-id.org/ckfinder/userfiles/files/33456673157.pdfIn PDF document text
    • http://tatishev.ru/admin/ckfinder/userfiles/files/gifovanaburitosuv.pdfIn PDF document text
    • http://kpotplace.com/uploads/files/52186274263.pdfIn PDF document text
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/16141457d526aa---gubaxu.pdfIn PDF document text
    • http://superazs.ru/images/news/file/50156755929.pdfIn PDF document text
    • http://ebus.cn/up_file/file/zubusone.pdfIn PDF document text
    • http://gospel-pour-100-voix.com/fichiers/newsletter/file/jofaxa.pdfIn PDF document text
    • https://sabresources.com/FCKuploads/file/rodinomawaminevuwokugefez.pdfIn PDF document text
    • http://aviatechinform.ru/sadm_files/mogikexexafudemesajeti.pdfIn PDF document text
    • https://siam-royal-view.ru/data/files/97466957800.pdfIn PDF document text
    • http://www.synagoge-stommeln.de/ckfinder/userfiles/files/babaxilisuduteler.pdfIn PDF document text
    • https://bodykneadstherapy.com.au/ckfinder/userfiles/files/dajexanutut.pdfIn PDF document text
    • https://happycondo.leaddeehub.com/userfiles/files/65152874720.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_off0000dfd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFD7 10932 bytes
SHA-256: a6edccf40c8fc0ef4562edb142458714ac0e652895d27c5e29b844bb669dc15a
font_01_sfnt_off0000f93b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF93B 17760 bytes
SHA-256: 29f29ca31e0dd5e23a0923a9fda1b2bdc238f38a530cc05383636c6c7b713a5c
font_02_sfnt_off00012764.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12764 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1