Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd186355927dc307…

MALICIOUS

PDF

70.5 KB Created: 2021-10-04 09:03:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 238457362654dd7f9d211ac073fc0d04 SHA-1: f5de2165211bf5ae78438d8144e30f03f1a8d24f SHA-256: bd186355927dc3075b0dfe1d9d326213e57b1b4f59a61af1532d25a73207aaad
174 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document containing embedded JavaScript and a large number of external URIs, many of which are structured as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The embedded JavaScript and numerous links suggest an attempt to redirect the user to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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://chcial.ru/uplcv?utm_term=best+minecraft+hacked+client+for+2b2t PDF link annotation
    • http://debeleven.net/UserFiles/File/sunoku.pdfIn PDF document text
    • http://fence-alarm.com/userfiles/files/kunozosalolatezikokiga.pdfIn PDF document text
    • http://ccforum.kr/uploads/file/1632108467.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161585bb75414a---9672655969.pdfIn PDF document text
    • https://vivekanandbawwa.com/userfiles/file/zimodudunen.pdfIn PDF document text
    • http://qdcmd.com/data/files/bemewikileruvuzubakafeb.pdfIn PDF document text
    • https://budgetparking.ca/admin/uploads/file/kezulisuvexogusivome.pdfIn PDF document text
    • https://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/76795550e84b29de4e2a7924f4eee9f7/wegizuraraj.pdfIn PDF document text
    • https://tjp2-hotlink-j3t.com/contents/files/vapajaluti.pdfIn PDF document text
    • https://illustrations.noche.fr/images/files/dirakujivinox.pdfIn PDF document text
    • http://mytrangroup.com/uploads/userfiles/file/32713552025.pdfIn PDF document text
    • http://ndc-group.ru/uploads/files/vurasun.pdfIn PDF document text
    • http://adec-interiors.net/Uploads/file/gamujaxusuzamok.pdfIn PDF document text
    • http://e-photo.lv/ckfinder/userfiles/files/96755853213.pdfIn PDF document text
    • https://postele-z-masivu.sk/ckfinder/userfiles/files/78402508687.pdfIn PDF document text
    • http://nacyc.jp/Upload/file/velisowutaxenapo.pdfIn PDF document text
    • http://zvezda-rostov.ru/ckfinder/userfiles/files/vovojog.pdfIn PDF document text
    • http://baheth24cars.com/ckfinder/userfiles/files/lenem.pdfIn PDF document text
    • https://whitesal.com/data/images/file/1335_20210917111615.pdfIn PDF document text
    • http://kingtonkatsu.com/uploads/files/27751216907.pdfIn PDF document text
    • http://sooam.com/files/fckeditor/file/414045021615a5dd2a0601.pdfIn PDF document text
    • http://crystaltrade.hu/data/file/17007701391.pdfIn PDF document text
    • http://michellenevinracing.com/FCKeditor/file/25408415670.pdfIn PDF document text
    • http://jeansresource.com/js/ckfinder/userfiles/files/64417005166.pdfIn PDF document text
    • http://mega-gold.com/userfiles/files/gasamepute.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_off0000b2f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2F0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cb07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB07 11148 bytes
SHA-256: a610cd629f30b26157856c0a9013756e1a36a1317723f73f0b5a747305a7ae57
font_02_sfnt_off0000e4ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4EA 15448 bytes
SHA-256: bb0627bd5bd35bec6e8c72fb59efeb336db4940df7a257f2bddf24dc0c4445c4