Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f7cd99808b291e8…

MALICIOUS

PDF

81.4 KB Created: 2021-09-15 23:53:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 979c78a33a104e7c2cb2b9f13ce438f3 SHA-1: 7c51c28fca2f640d9eb8325a3e5354d223706742 SHA-256: 6f7cd99808b291e8f10ee70463ec2cc1989cd764c59297c28c78a8d64becafd7
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as a malicious PDF by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to external link farms and disposable hosting, suggesting a phishing or malware distribution scheme. The PDF structure and embedded content are consistent with attempts to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 https://laborke.ru/uplcv?utm_term=pubg+android+link PDF link annotation
    • http://agierresrl.it/userfiles/files/litexelajew.pdfIn PDF document text
    • http://alituncer.net/userfiles/file/tugovomibaxuvufidojabuvek.pdfIn PDF document text
    • http://nato-denkmal.de/uploads/file/nagosixazosikuromufokuku.pdfIn PDF document text
    • https://lotte-ppta.net/beta/assets/file/bawodopafifurugiv.pdfIn PDF document text
    • https://habibitours.net/ckfinder/userfiles/files/25237977900.pdfIn PDF document text
    • http://jonme.net/ckupload/files/1073931426.pdfIn PDF document text
    • http://veterinariacomportamentale.it/userfiles/files/1352687210.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d35230fb96---niwuzenejutakusitozozibub.pdfIn PDF document text
    • http://cariboohose.com/userfiles/file/198772802.pdfIn PDF document text
    • https://tecnicadovolante.com/images/file/43129248348.pdfIn PDF document text
    • http://likuidart.com/files/ckeditor/files/16062156511.pdfIn PDF document text
    • http://dd-eng.com/files/files/vagupekewuguroji.pdfIn PDF document text
    • http://kommunikator.nu/demo/userfiles/file///56520070339.pdfIn PDF document text
    • http://kammed.com/userfiles/file/31237539650.pdfIn PDF document text
    • https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1613bc6e3843a9---ridijazejutafebadaguwogob.pdfIn PDF document text
    • http://chia4kids.ru/ckfinder/userfiles/files/pugexoxozuwuzajir.pdfIn PDF document text
    • https://lawweb.info/mycms/admin/userfiles/file/zibinonawolok.pdfIn PDF document text
    • http://italy-ex.com/images/blog/file/26802283486.pdfIn PDF document text
    • http://ulleungroadtour.com/FileData/ckfinder/files/20210901_BDFCC564F321B18B.pdfIn PDF document text
    • http://evaemlak.com/userfiles/file///25064598034.pdfIn PDF document text
    • http://spy-military-labs.com/userfiles/file/zejorogeviribakotujera.pdfIn PDF document text
    • http://hoya-system.com/uploads/files/202109131843275458.pdfIn PDF document text
    • https://ldoris.com/upfile/files/20210902011453.pdfIn PDF document text
    • https://egokituz.org/files/galeria/files/kajosanitisanu.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_off0000d973.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD973 18256 bytes
SHA-256: 46c9e6cbf37364f043c4d657184001c493106dcb7e56127b9b14ca29f960953f
font_01_sfnt_off00010908.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10908 10360 bytes
SHA-256: f3d19d729fb9dd8daea6c7608da150c34673269331c8a8dbd000878aa4f70602
font_02_sfnt_off0001202c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1202C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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