Malicious PDF — malware analysis report

Static analysis result for SHA-256 afdadf639ff2f3aa…

MALICIOUS

PDF

72.7 KB Created: 2021-09-26 06:47:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: ef3e46f2b9242f0a242b695ff0639b2f SHA-1: f1f08645a0a50b98bef3550d2328f6de30fe66b1 SHA-256: afdadf639ff2f3aaf2c58d29a604a6beb08cbf05ff89e6352bd61f2ccdf1cf65
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, and exhibits characteristics of a link farm with numerous external URLs. The PDF structure and embedded URIs suggest it is designed to lure users to potentially malicious websites, likely for phishing or to download further malware. While no scripts were explicitly extracted, the PDF format itself can embed JavaScript for malicious purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9827

Heuristics 5

  • 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.
  • 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://catamma.ru/uplcv?utm_term=infinite+mod+apk PDF link annotation
    • http://tevukasveza.lt/ckfinder/userfiles/files/renajotup.pdfIn PDF document text
    • https://aukshanya.promosing.com/alpha/ckfinder/userfiles/files/71871008956.pdfIn PDF document text
    • https://gkscam.com/userfiles/file/xokenuxarev.pdfIn PDF document text
    • http://rana-international.com/userfiles/files/busumovekavapinep.pdfIn PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/161386f7614dd6---telewezowabuzimakap.pdfIn PDF document text
    • http://blessingsngo.in/userfiles/files/kexil.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613990f85e86f---ragekajidetusifeka.pdfIn PDF document text
    • http://studiomilano.eu/userfiles/files/87524736262.pdfIn PDF document text
    • https://brothers-music.com/ckfinder/userfiles/files/62517102160.pdfIn PDF document text
    • http://santeh.md/img/files/mumoxiben.pdfIn PDF document text
    • https://linker.tw/files/79453673421.pdfIn PDF document text
    • http://karat-dobremiasto.pl/userfiles/file/sekiditupopina.pdfIn PDF document text
    • https://31app.com/userfiles/file/saxuduwurujus.pdfIn PDF document text
    • https://navliecky.net/userfiles/file/kopetalopilop.pdfIn PDF document text
    • http://eros-arena-reutlingen.de/eros/userfiles/file/motesanenegabonajojegibo.pdfIn PDF document text
    • http://lollanaclinic.com/image/upload/File/jadegis.pdfIn PDF document text
    • https://vietnam-pump.com/userfiles/file/33115145008.pdfIn PDF document text
    • http://luligang.com/ckfinder/userfiles/files/68927408181.pdfIn PDF document text
    • https://rajatotogroup4.com/contents/files/485640712.pdfIn PDF document text
    • http://sns-russia.ru/userfiles/file/kebunezofisabogatajesese.pdfIn PDF document text
    • http://thehedgerowchronicles.com/ckfinder/userfiles/files/36641912994.pdfIn PDF document text
    • http://zpb-maciejewski.pl/upload/fck/file/vuxovikoxomaror.pdfIn PDF document text
    • http://www.sm.ac.th/ckfinder/userfiles/files/73824991370.pdfIn PDF document text
    • http://carszana.com/image/upload/File/82209783317.pdfIn PDF document text
    • https://alrashed-alsaleh.com/userfiles/files/beridiwamebabonojag.pdfIn PDF document text
    • http://xn--9w3b11kh5l.com/ckupload/files/jeribitebupiwuxalanolevin.pdfIn PDF document text
    • https://ispartaorganizasyon.com/ckfinder/upload/files/todarivukiwiritorazo.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_off0000b74d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB74D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cf5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF5F 17892 bytes
SHA-256: c35c43d245a6a022820031d663115365720f741222c181f669384d9749235271
font_02_sfnt_off0000fdcd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDCD 10388 bytes
SHA-256: 70e75ec577517a3bb329ce1133ba65025bde02c07e5614791dda3be2e09f4580