Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb93861b22524264…

MALICIOUS

PDF

73.8 KB Created: 2021-09-17 22:55:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: ae9b36e87586561c270a798407cad691 SHA-1: 6fd7544d889da88f72f14628713aa58a2a58a109 SHA-256: cb93861b22524264a2ae1e7e62192cb980e14d70b7f5908bc70c7712088735c2
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, and it contains embedded JavaScript. The PDF also exhibits characteristics of a link farm, with a high number of external URLs pointing to various domains, many of which are likely disposable. This suggests the primary function is to redirect users to potentially malicious content or facilitate the download of additional payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

Heuristics 6

  • 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.
  • 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://pixomot.ru/uplcv?utm_term=pixel+data+saver PDF link annotation
    • https://techlan.pl/files/file/18540115996.pdfIn PDF document text
    • http://lmleadmanagement.com/userfiles/files/zasiresuwegenajuronokow.pdfIn PDF document text
    • http://futurepoolandspa.com/ckfinder/userfiles/files/nimododupapavojapel.pdfIn PDF document text
    • https://energiadirect.pl/application/resources/ckfinder/userfiles/files/fiwalumoloxubeliv.pdfIn PDF document text
    • https://jgranit.pl/userfiles/file/9286040429.pdfIn PDF document text
    • http://mixmarketing.vn/upload/fck/file/dedipulutegotukaroja.pdfIn PDF document text
    • http://appartementslisa.it/an3_Uploads/file/47724229540.pdfIn PDF document text
    • http://weorderfood.com/uploads/files/8530412336.pdfIn PDF document text
    • http://zamgph.com/FCKeditor/editor/filemanager/connectors/php/uploads/file/121350357567.pdfIn PDF document text
    • http://jr.ac.th/ckfinder/userfiles/files/22650666018.pdfIn PDF document text
    • http://ylplj.com/ckfinder/userfiles/files/79554232645.pdfIn PDF document text
    • http://hicoweld.com/shop/fck_file/file/73901047382.pdfIn PDF document text
    • http://alatasfilms.gr/ILC/img/file/60115540466.pdfIn PDF document text
    • http://architettoseneca.com/userfiles/files/22303723138.pdfIn PDF document text
    • http://ksiclubcom.ksiclub.org/svnprojects/DHD/Source/images/files/gujowegamajadazibixasaz.pdfIn PDF document text
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/ea6b35abfef826ef749baa4b04fa2eec/sozobazegirofutanuda.pdfIn PDF document text
    • http://wxmx.cn/upload/ckimg/files/202109011046515401.pdfIn PDF document text
    • https://legacydockandmarine.com/wp-content/plugins/super-forms/uploads/php/files/3a1d1a9fd123c46e98d2841d90e3ba0a/noxukoxolo.pdfIn PDF document text
    • http://www.laterveer-biesenbeek.nl/ckfinder/userfiles/files/barozojepegirararapebi.pdfIn PDF document text
    • http://nwatchonline.net/userfiles/file/wojesedukodaz.pdfIn PDF document text
    • https://ruh-center.ru/userfiles/file/gotafogag.pdfIn PDF document text
    • http://aunay-sous-auneau.fr/ckfinder/userfiles/files/89450483621.pdfIn PDF document text
    • http://toyotaprius-custom.com/js/upload/files/2222757964.pdfIn PDF document text
    • https://groupekineconcept.com/userfiles/file/tabodawowowafur.pdfIn PDF document text
    • http://cjatkinson.com/userimages/rekarareze.pdfIn PDF document text
    • http://magiepourenfants.com/images/mediamanager/file/jodaxunasapakirira.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_off0000ba91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA91 18412 bytes
SHA-256: db72ddd2416e8d79c386767f59ea3478c55688d29114f9159182ae17d167912b
font_01_sfnt_off0000ea92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA92 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000102a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102A9 10184 bytes
SHA-256: 4684299ccbd5b42ef2c4e8890f85bc1c3197b96945aa899584270ad80d24aed2