Malicious PDF — malware analysis report

Static analysis result for SHA-256 bdb20b60dcab576b…

MALICIOUS

PDF

81.4 KB Created: 2021-04-21 20:07:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 278ec06574f421fe583b3e91e29a8a6f SHA-1: 7da91f05d97f301032cb3976dae0c7e26aac806d SHA-256: bdb20b60dcab576b5d37ade5b8aff2fb2b6c6cd32490dabffac157afc561fe40
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, indicative of a link farm or SEO manipulation tactic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://jottigo.ru/strik?utm_term=estructura+externa+de+textos+informativos PDF link annotation
    • http://dapisamifo.22web.org/manualidades_con_botellas_plsticas_de_gaseosa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4502511/normal_602fab45228f3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366957/normal_6041008fcd8fd.pdfIn PDF document text
    • http://fejiximodanu.mygamesonline.org/interaction_between_biotic_and_abiotic_factors_in_an_ecosystem.pdfIn PDF document text
    • http://kanudivuvim.iblogger.org/dsc_alexor_pc9155_manual.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://e4da1597-3bb3-488b-9226-7c2c9e06e9ce.filesusr.com/ugd/db5d73_9694e58570b14f5888f256f750427407.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/najubu/how_to_find_ratio_using_calculator.pdfIn PDF document text
    • https://s3.amazonaws.com/wovigebi/email_writing_format_samples_for_customer_service.pdfIn PDF document text
    • http://mirokukuvo.rf.gd/calendario_2020_ottobre.pdfIn PDF document text
    • http://zojimako.rf.gd/sega_genesis_classics_ps4_trophy_guide.pdfIn PDF document text
    • http://lugopupi.rf.gd/nicholas_sparks_books_ranked_best_to_worst.pdfIn PDF document text
    • https://s3.amazonaws.com/minabiwa/8828581723.pdfIn PDF document text
    • http://rivenoke.onlinewebshop.net/lavalatazelapururojojenu.pdfIn PDF document text
    • https://s3.amazonaws.com/fulazelof/kindergarten_coloring_sheets_fall.pdfIn PDF document text
    • https://s3.amazonaws.com/vuliwisuwig/labapategibidikavez.pdfIn PDF document text
    • https://f730d15c-1921-46d2-b6d4-288333e40990.filesusr.com/ugd/e2c223_f4ec82c7259e4c1083fe911b50fc1960.pdf?index=trueIn PDF document text
    • https://ed59cdd8-0d75-4634-8bb2-7afdb9da103e.filesusr.com/ugd/9cb112_ce2b03253e2c4c41ae2ddfe97938768a.pdf?index=trueIn PDF document text
    • https://b0c090b1-cb02-46d8-8a69-3fb9d82636b6.filesusr.com/ugd/4dbf3f_c412dbdb2c9d4df3b51e1e149c6eb0eb.pdf?index=trueIn 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://scripts.sil.org/OFLIn 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_off0000e861.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE861 5220 bytes
SHA-256: e00ba30db345d764fed3cca3b47a48573222095dddb5d4bd5903442e44766646
font_01_sfnt_off0000fa14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA14 12596 bytes
SHA-256: cdc8d95374c710e8dc912f6bda6d7a5fc63157628f0aec3d889a59d3a5181cab
font_02_sfnt_off0001234c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1234C 16164 bytes
SHA-256: 3f70697d8cfd0b9becff5adcad726f9ffedcc5d773cc6f7abbcc82b2f8034994

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