Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3adbc2e1c3db069…

MALICIOUS

PDF

75.5 KB Created: 2021-02-11 01:32:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: db4bb9ef2c917625e7582a0abba462af SHA-1: cef42acdb6c223ce54a65177375c40d38af077aa SHA-256: c3adbc2e1c3db06988715a540924e9fc09b5b7773fe469482e8f4e3e4c913673
126 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, with one specifically flagged as an external URI pointing to 'druttle.ru'. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the PDF is part of a link farm on disposable hosting, further supporting a phishing or malware distribution scheme. No scripts were extracted, but the overall structure and URL patterns are indicative of a malicious PDF.

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 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://druttle.ru/123?utm_term=cell+biology+topics+for+presentation PDF link annotation
    • http://haustova.com/como_blanquear_el_ano_de_forma_naturall39pk.pdfIn PDF document text
    • https://pofubelepegeva.weebly.com/uploads/1/3/0/7/130776421/ea7065d4e4fee8.pdfIn PDF document text
    • http://b0xberry.online/wikuzuxatawuworiwelesebtnk0.pdfIn PDF document text
    • http://1cats.space/77928277556iy6dt.pdfIn PDF document text
    • https://ziwuvofoxovexo.weebly.com/uploads/1/3/1/1/131163777/639606.pdfIn PDF document text
    • http://auth02mobility.com/ib_theatre_collaborative_project_criteriag8x88.pdfIn PDF document text
    • http://makamar.tech/watch_romance_movie_onlineeaqr8.pdfIn PDF document text
    • http://requiremcgood.com/sibeteveresich7z8.pdfIn PDF document text
    • https://kezunegewekal.weebly.com/uploads/1/3/1/4/131483031/nixikeg.pdfIn PDF document text
    • https://gariligiradafa.weebly.com/uploads/1/3/4/0/134041078/8868452.pdfIn PDF document text
    • http://tacfitproducts.com/lexudagilobubikejanepozatvbw1.pdfIn PDF document text
    • http://realwockyc.info/gufuxekuzusetinerawa3jje6.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fofeparulofiz.rf.gd/experience_letter_template_for_green_card.pdfIn PDF document text
    • http://zasidad.epizy.com/chanel_annual_report_2017.pdfIn PDF document text
    • https://s3.amazonaws.com/ladiwuzetawedi/best_antivirus_software_for_windows_7.pdfIn PDF document text
    • https://s3.amazonaws.com/verirejon/external_style_sheet_for_table.pdfIn PDF document text
    • http://xubibufopude.epizy.com/36138571135.pdfIn PDF document text
    • https://s3.amazonaws.com/vabedafozo/basic_chinese_to_english_translation.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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e904.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE904 5328 bytes
SHA-256: 33f4378adc67d931739daa5d1177295bd9bdb9f73e980ebd4b1c7483b8ecb618
font_01_sfnt_off0000fb3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB3D 11108 bytes
SHA-256: 49c9862ebb894bd5979beb494c2f40afbf24c05595f13f7089a67e2a97bcd19b

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