Malicious PDF — malware analysis report

Static analysis result for SHA-256 d15444feb31fe363…

MALICIOUS

PDF

69.1 KB Created: 2021-09-27 18:05:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: a90f934d596bcbcd9b8c19715e3d0607 SHA-1: fe2cf3c36559cfcf2a52c66c3ea8cf75f05d8f21 SHA-256: d15444feb31fe3633aedbb5ce7d3b28de072b26a52ca2ad23a7e50d4d64d8301
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript and a large number of external URIs, many of which are hosted on disposable domains and appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The embedded JavaScript is likely used to facilitate the redirection to these malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://oniceh.ru/uplcv?utm_term=chichen+itza+cancun+mexico PDF link annotation
    • http://dragonera.cn/admin/userfiles/file/97652662884.pdfIn PDF document text
    • https://reparationmobile.net/userfiles/file/68654245220.pdfIn PDF document text
    • https://chatsystem.site/js/ckfinder/userfiles/files/81153010790.pdfIn PDF document text
    • http://logo4you.dk/userfiles/file/58807771518.pdfIn PDF document text
    • http://chikatere.com/Upload/files/xemine.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16149094a54338---jiruba.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/50703947908.pdfIn PDF document text
    • https://verlauf-ekb.ru/admin/ckfinder/userfiles/files/33910353965.pdfIn PDF document text
    • https://inverpalmas.com/aym_image/files/79404054469.pdfIn PDF document text
    • http://kimhoatra.com/upload/fckimagesfile/63134304197.pdfIn PDF document text
    • http://shortguycentral.com/ck_uploads/files/98315414070.pdfIn PDF document text
    • http://www.stemcellhairclinic.com/files/files/dalirome.pdfIn PDF document text
    • http://www.hgbehringer.de/img/files/files/rurapixilixelimiwuw.pdfIn PDF document text
    • http://getsolarny.com/userfiles/file/10644876898.pdfIn PDF document text
    • http://auroraenergyproject.it/userfiles/files/49549528638.pdfIn PDF document text
    • https://martan.es/cenavarra_userfiles/files/58397029806.pdfIn PDF document text
    • http://mygiftltd.com/userfiles/file/13869273454.pdfIn PDF document text
    • http://geodez.com/pliki/file/95832712848.pdfIn PDF document text
    • https://keepingscore.org/userfiles/file/xeludapobenenegeteni.pdfIn PDF document text
    • https://www.renfrewareahealthvillage.ca/ckfinder/userfiles/files/liwugerulezimij.pdfIn PDF document text
    • https://tekmaker.com/upload/files/nujibesi.pdfIn PDF document text
    • http://zhodnoceni-penez.cz/is/images/FCKeditor/File/45027622813.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_off0000ad6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAD6B 10472 bytes
SHA-256: 73e673cdedb3c2133694a7139af4f1a97d12a6cca075056a72cf5e02bd396024
font_01_sfnt_off0000c51d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC51D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000dd2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD2F 16392 bytes
SHA-256: 99337d2ee25ac680981baf6d12f192f4d1ce0d3bb7b40becf0dd71ca3c771abb

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