Malicious PDF — malware analysis report

Static analysis result for SHA-256 9051fee849feea52…

MALICIOUS

PDF

71.3 KB Created: 2021-09-19 16:53:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 7568f51ad50647d1b1d3939ed31e86ce SHA-1: bb789f6b43d65abb8d78a51eda9429b694c30e4d SHA-256: 9051fee849feea52564ce0b6e50fadaf2fbcd94be7b86c95b7d1c078ffd2135c
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, with high confidence. It contains embedded JavaScript and numerous external URIs pointing to disposable domains, indicating a phishing or malware distribution attempt. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this by identifying the sample as a link farm on disposable hosting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://allytemp.ru/uplcv?utm_term=histogram+chart+excel PDF link annotation
    • http://lnshiyue.com/userfiles/file/20210905182300_917777766.pdfIn PDF document text
    • https://www.lire-les-notes.com/ckfinder/userfiles/files/22486463420.pdfIn PDF document text
    • http://elsped.hu/files/file/bexapetuvagubadixuwolu.pdfIn PDF document text
    • http://wangguanhardware.com/userfiles/file/rilejeje.pdfIn PDF document text
    • http://tnslib.su/userfiles/files/9273828502.pdfIn PDF document text
    • http://tubietelbar.hu/uploadfile/55985350727.pdfIn PDF document text
    • https://nasikampung.info/contents/files/29557846310.pdfIn PDF document text
    • http://e-district.org/userfiles/file/tugisegalar.pdfIn PDF document text
    • https://kcharp.com/ckfinder/userfiles/files/32068498550.pdfIn PDF document text
    • https://luatsuavina.com/userfiles/file/dokunefidelefex.pdfIn PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/16146e2c11139e---35627439704.pdfIn PDF document text
    • http://gloria-eurex.com/images/blog/file/bumakizefafevufozifiv.pdfIn PDF document text
    • http://www.ettermanenterprises.com/ckfinder/userfiles/files/36480164477.pdfIn PDF document text
    • https://hospvetcentral.pt/site/upload/file/dalopetitikibega.pdfIn PDF document text
    • https://huaku3c.tw/uploads/files/202109020711063287.pdfIn PDF document text
    • https://vinadesigndanang.vn/uploads/image/files/lojiduvukuxuguvamef.pdfIn PDF document text
    • https://i-chat.tw/js/ckfinder/userfiles/files/28888796921.pdfIn PDF document text
    • http://vlaamspatientenplatform.be/_plugin/ckfinder/userfiles/files/dugesobenofizixoxurigaz.pdfIn PDF document text
    • https://ip-kamera-rendszer.nuttydog.hu/ckfinder/userfiles/files/kimefufidebirenariketi.pdfIn PDF document text
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/161322e2e3d028---pebux.pdfIn PDF document text
    • http://www.azurwelcomeservices.com/userfiles/file/vivigu.pdfIn PDF document text
    • http://opgzvh.hr/upload/file/75623048000.pdfIn PDF document text
    • http://pharmabiosolutions.com/filespath/files/20210912031727.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_off0000b5e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5E1 10668 bytes
SHA-256: 219e8f2203c2d92f8e11643ad8e67e87237a6d30f9656eafb076d363127ca564
font_01_sfnt_off0000ce5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE5B 15984 bytes
SHA-256: 3b36655675808fb1770edc7be8738b33cce0ba66dce9068e121238d3f74d1a9c
font_02_sfnt_off0000f788.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF788 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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