Malicious PDF — malware analysis report

Static analysis result for SHA-256 a814d7ab3e4f53e8…

MALICIOUS

PDF

82.2 KB Created: 2021-09-23 09:28:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: c24b3f338386d5fa03a4c2fbeb9ab037 SHA-1: bb82a5b5663175afb381c28a140fd5b076de7b90 SHA-256: a814d7ab3e4f53e8ea9b15bc311359d72eb26292fc814d63d328d66d64e94b92
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to external domains, many of which are identified as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM suggests a tactic to obscure the true malicious destination by using many disposable domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://crewmak.ru/uplcv?utm_term=how+to+get+back+deleted+viber+messages+android PDF link annotation
    • http://gibisch.info/files/files/98130637221.pdfIn PDF document text
    • http://nacyc.jp/Upload/file/lowujukufuza.pdfIn PDF document text
    • http://odontotecnicacoop.it/userfiles/file/66955348500.pdfIn PDF document text
    • http://liluby.com/upload/file/15441369007.pdfIn PDF document text
    • http://mikailang.com/userfiles/file/20210911194750_1769774027.pdfIn PDF document text
    • https://abisspaandboutique.com/nbloom/fckuploads/file/mupipafanifuzoxulodowuma.pdfIn PDF document text
    • https://www.hinkler.com.au/application/third_party/ckfinder/userfiles/files/fovurifidimunidomeguned.pdfIn PDF document text
    • http://yas-center.ru/userfiles/file/pepuwitanefosefuwilife.pdfIn PDF document text
    • http://myxroad.net/upload/userfiles/file///bixidekulujirezatis.pdfIn PDF document text
    • https://a2designbg.com/userfiles/file/7254352062.pdfIn PDF document text
    • https://threadworx.com/thread/admin/uploads/file/70029692803.pdfIn PDF document text
    • http://www.museopizarra.com/ckfinder/userfiles/files/98086023594.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/161445aa37441e---vadagatemibe.pdfIn PDF document text
    • http://hanifeugur.com/image/files/jijaxafi.pdfIn PDF document text
    • https://sieuviet.net/webroot/img/files/31331111814.pdfIn PDF document text
    • http://www.lnk-creation.fr/upload/file/70970322281.pdfIn PDF document text
    • https://xn--fct8ml6mwue.tw/uploads/files/fofebadimipuzapuja.pdfIn PDF document text
    • http://timnhanhonline.com/upload/files/1172290508.pdfIn PDF document text
    • http://zkojicin.cz/userfiles/file/vaxozi.pdfIn PDF document text
    • http://luxlustry.ru/img/upload/xomowo.pdfIn PDF document text
    • http://reckdance.pl/userfiles/file/zapej.pdfIn PDF document text
    • https://www.baust.edu.bd/app/webroot/ckfinder/userfiles/files/fiwibuzolakasoluri.pdfIn PDF document text
    • http://zs.tom.ru/jsplugins/ckfinder/userfiles/files/tipofimejerimusukom.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_off0000dbe7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBE7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f3fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3FE 11088 bytes
SHA-256: 33bfa3c6c27ca27c66fdb067d2dfd282822639901c39206d2ecd5cc408eb8f4f
font_02_sfnt_off00010db1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DB1 17664 bytes
SHA-256: 25e1310f516e2ac4a6976de4d2a9b26e4b4a68991976301302143408680a65a9

Open this report in the interactive analyzer, or submit your own file for analysis.