Malicious PDF — malware analysis report

Static analysis result for SHA-256 adf7f403b015098c…

MALICIOUS

PDF

69.3 KB Created: 2021-09-23 19:01:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 3f9ffb2fdd52ed02c1cc9aa8e5111955 SHA-1: 8adbfe111758b088b630ed7b306462f95dc24555 SHA-256: adf7f403b015098c7ea4f3f3d2f33563ca90f9dfb5bdca2f928c9ea656b5d58e
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample contains embedded JavaScript, a common technique for malicious PDFs to execute actions like redirecting users to malicious sites. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic and numerous unknown URLs suggest a link farm designed to obscure the true destination, likely a phishing or malware distribution site. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://elitestrategyglobal.com/wp-content/plugins/super-forms/uploads/php/files/256047f2b0b1e81284c81e2322892043/zajubabolikebefatozel.pdf In PDF document text
    • http://domainecomps.com/documents/files/95315757588.pdfIn PDF document text
    • https://oglethorpeclub.org/~oglethor/UserFiles/file/82974678599.pdfIn PDF document text
    • http://wxmx.cn/upload/ckimg/files/202109210822196606.pdfIn PDF document text
    • http://harringtonandlombardi.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/56108907433.pdfIn PDF document text
    • http://aibasavar.edu.bd/app/webroot/ckfinder/userfiles/files/57553359475.pdfIn PDF document text
    • http://dobrasekacka.cz/userfiles/file/10601679921.pdfIn PDF document text
    • http://leruichem.com/upload/files/resuxeditewazaleleka.pdfIn PDF document text
    • http://viral-list-monster.com/ckfinder/userfiles/publics/files/vexudatoxetokojogojizu.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/3d9c89dd917d48baa8bfe46baa78b445/lejedinumenotinuluf.pdfIn PDF document text
    • https://maritime-models.com/userfiles/file/pumilikegorawafal.pdfIn PDF document text
    • https://palcev.ru/userfiles/file/32726461529.pdfIn PDF document text
    • https://dzido.pl/userfiles/file/rufagawijova.pdfIn PDF document text
    • http://kpotplace.com/uploads/files/89286554385.pdfIn PDF document text
    • https://forumhrdbekasi.com/webroot/userfiles/files/72083172347.pdfIn PDF document text
    • http://www.coverseg.com/uploads/ckfinder/files/3108525114.pdfIn PDF document text
    • http://bienbao.org/uploads/files/ridisapewebuditawazogil.pdfIn PDF document text
    • http://samtekelektrik.com/files/94012054956.pdfIn PDF document text
    • http://technoauto.jp/js/upload/files/62366356643.pdfIn PDF document text
    • https://interstudy.net/userfiles/file/40992243641.pdfIn PDF document text
    • https://flcevent.fcu.edu.tw/plugin/ce1/ckfinder/userfiles/files/20210902083617.pdfIn PDF document text
    • http://codefon.hu/js/ckfinder/userfiles/files/44180395728.pdfIn PDF document text
    • http://huerural.com/uploads/image/files/42154425225.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=how+to+secretly+record+screen+on+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_off0000b3dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3DD 10556 bytes
SHA-256: 5a80936bdee912a4b015b5c73eb6927bafe00c2819291a7d8f04cba0d75e8add
font_01_sfnt_off0000cc1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC1F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e431.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE431 14268 bytes
SHA-256: 46a624ae04563bdf5d69f28496cbf406f0d32cc9d88e025fc04e562a2924a201