Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f71e6d4eb1929cb…

MALICIOUS

PDF

84.1 KB Created: 2021-09-20 14:47:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: c9030d5fe6060baa1c0047f633f437bc SHA-1: 105ae051639e0b916b933da33385249a9ba35548 SHA-256: 5f71e6d4eb1929cbd82689b478d8a9b47bddcbb3b5990b2a521bfc18d31ba0fb
174 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains embedded JavaScript and a high number of external URIs pointing to disposable domains, indicating a phishing or malware distribution attempt. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic strongly suggests the document is designed to trick users into downloading a password-protected payload, likely to evade gateway scanning. The ML classifier also flagged this PDF as malicious with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://coretry.ru/uplcv?utm_term=photo+makeup+app+download+for+pc PDF link annotation
    • http://www.dagmarsvendova.cz/admin/js/ckfinder/userfiles/files/84846827378.pdfIn PDF document text
    • http://pass38.com/images/contentimages/files/derupupubadigimuwot.pdfIn PDF document text
    • http://moonlightmontessori.com/upload/files/ramus.pdfIn PDF document text
    • http://mhfmjournal.com/data/22/2/55/64/2544879/user/2788947/htdocs/userfiles/file/13198874365.pdfIn PDF document text
    • http://jsqnchem.com/upload/files/gapenugikinitomoxalo.pdfIn PDF document text
    • http://assisdrive.pt/userfiles/file/mokijifodofedoma.pdfIn PDF document text
    • https://ataru.site/js/ckfinder/userfiles/files/nezeru.pdfIn PDF document text
    • http://emirates-offshore.com/uploads/image/file/rigedalonasedulib.pdfIn PDF document text
    • https://servicepapik.ro/files/57326995764.pdfIn PDF document text
    • http://palenice.net/obrazky_clanky/file/xolefomexivira.pdfIn PDF document text
    • https://brincandoeaprendendo.com/fotosempresa/files/40906352306.pdfIn PDF document text
    • http://shop-exclusive.cz/userfiles/file/59526036420.pdfIn PDF document text
    • http://dichvutot99.com/webroot/img/files/domofuzojekukon.pdfIn PDF document text
    • https://stabiactiv.com/userfiles/file/31196009590.pdfIn PDF document text
    • https://tiemhoahaibara.com/data/dulieu/files/wupedapevoxokatezufagasak.pdfIn PDF document text
    • https://eastoncn.housemember.com/uploads/files/movenewe.pdfIn PDF document text
    • http://drentmedischadvies.nl/uploads/files/36347042249.pdfIn PDF document text
    • http://aburobocon2019.mnb.mn/uploads/files/9068743832.pdfIn PDF document text
    • https://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/2674ae777c29cd74e05886e7cb7dac28/zadidatukuganuzibobedab.pdfIn PDF document text
    • http://samocvet.org/foto/ck/files/36135778888.pdfIn PDF document text
    • http://psychanalyste-gard.fr/ckfinder/userfiles/files/banamodijisagejopobo.pdfIn PDF document text
    • https://ls-machinery.com/uploadpic/files/202109151737523919.pdfIn PDF document text
    • http://teamwork-poetschke.com/ckfinder/userfiles/files/muviw.pdfIn PDF document text
    • http://prepearl.com/uploadsfile/27219439565.pdfIn PDF document text
    • http://24x7taazasamachar.com/assets/ckfinder/core/connector/php/uploads/files/nutum.pdfIn PDF document text
    • https://csmgh.net/pevron/www/img/file/25541257071.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_off0000e30c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE30C 10904 bytes
SHA-256: f217cfa4fec4a2bc5eeaa03db860ac6f2c1525b9150097c9cd5279c130c99d69
font_01_sfnt_off0000fc2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC2A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001143c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1143C 17864 bytes
SHA-256: ded6a9ac52f8d82cf764bfe38e56493d80fcd78ce849ddabab2ed05123ec1f1e