Malicious PDF — malware analysis report

Static analysis result for SHA-256 59763776eeda03d8…

MALICIOUS

PDF

80.0 KB Created: 2021-09-12 16:56:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: df101e2eb360e02ea3039704ede2a029 SHA-1: a96a3101d1322e7329810007dfa7aa677e93bb2b SHA-256: 59763776eeda03d8670a024992a2572463c90f106ed77c5117fb6a78140bcfba
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm with numerous external URIs pointing to potentially malicious or disposable domains. While no scripts were directly extracted, the PDF structure and the presence of many unknown URLs suggest an attempt to redirect users to malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 5

  • 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.
  • 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 http://songpinhao.com/userfiles/files/xarokisisinidis.pdf In PDF document text
    • http://pusancard.com/userData/board/file/xiputebejofi.pdfIn PDF document text
    • https://mediaskills.rs/files/walifozonorolixidubo.pdfIn PDF document text
    • http://gmart-express.com/demo/uploadpic/file/rakaputog.pdfIn PDF document text
    • https://binarbaidtrading.com/public_html/userfiles/file/27231400477.pdfIn PDF document text
    • http://clinicaveterinariaalbese.eu/userfiles/files/52156170715.pdfIn PDF document text
    • http://lycee-elm.org/userfiles/file/61865518568.pdfIn PDF document text
    • http://telegid.tv/userfiles/file/loboned.pdfIn PDF document text
    • http://bacsiha.com/public/ckfinder/userfiles/files/58440692173.pdfIn PDF document text
    • https://iieng.org/editor/ckfinder/userfiles/files/23750545641.pdfIn PDF document text
    • http://pantanalmsnews.com.br/ckfinder/userfiles/files/baxareniragizijoz.pdfIn PDF document text
    • http://dlabiura.kbo.pl/ckfinder/userfiles/files/89424340587.pdfIn PDF document text
    • https://hagakure.by/upload/editor/files/bisixitebome.pdfIn PDF document text
    • http://tatagz.com/uploadfile/files/75980987838.pdfIn PDF document text
    • http://barbusci.it/maisUserFile/file/kijatawux.pdfIn PDF document text
    • http://analogsys.com/uploaded/file/11337027161322916caa4f.pdfIn PDF document text
    • https://regiefranchet.fr/userfiles/files/zaniwekopajawinala.pdfIn PDF document text
    • http://murielbellhomes.com/userfiles/files/4752016118.pdfIn PDF document text
    • http://vcelari.naceradec.cz/includes/ckfinder/userfiles/files/sobadafigazilenoberuro.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d33536fe9a---10755881239.pdfIn PDF document text
    • http://doudou.tw/userfiles/files/lexojuwesegumesobajewemaw.pdfIn PDF document text
    • https://polymadeniyaglar.com/fckeditor/userfiles/file/10961440142.pdfIn PDF document text
    • http://abwwilson.com/uploads/files/goromiga.pdfIn PDF document text
    • http://straub-online.ch/userfiles/files/16728694738.pdfIn PDF document text
    • http://szhlfz.net/upload/28031985255.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=android+wifi+channelPDF link annotation
    • 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_off0000d5af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5AF 17768 bytes
SHA-256: 4b87f0b8445cc9a82938f4b3d069400d0c5da21c4ecb38eb3aac8641b244a27e
font_01_sfnt_off0001034c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1034C 10372 bytes
SHA-256: 686f40ffe767c26dd0b9a8ecd1c43ebfc9190a941d166be08082eb042cd3cc7a
font_02_sfnt_off00011ab3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AB3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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