Malicious PDF — malware analysis report

Static analysis result for SHA-256 53db4b7a9f71d524…

MALICIOUS

PDF

75.5 KB Created: 2021-02-10 21:47:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 354f76e6b049e852d7caa536816b59a0 SHA-1: 2390ec571c494f683877b25c568e00625b9ef572 SHA-256: 53db4b7a9f71d52413bcb026e2abc4acb8a3e4605f5e385d3953a735021e4bcf
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing or SEO link farm. It contains numerous external links, with one pointing to 'jacksth.ru', suggesting a potential attempt to redirect users or manipulate search engine results. While no scripts were explicitly extracted, the PDF structure and the presence of many external URIs indicate a likely malicious intent to host or link to further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 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://jacksth.ru/aws?utm_term=consonant+blends+worksheet+grade+4 PDF link annotation
    • https://bewobuvepo.weebly.com/uploads/1/3/2/6/132695749/6545454.pdfIn PDF document text
    • https://bizavewes.weebly.com/uploads/1/3/5/3/135323934/xevaz_borodujosoledem.pdfIn PDF document text
    • http://nefritthebestthing.site/jill_poole_textbook_on_contract_lawfpfgm.pdfIn PDF document text
    • http://bubuwem.iblogger.org/christian_songs_2019_free.pdfIn PDF document text
    • https://ginubeputugexow.weebly.com/uploads/1/3/0/7/130738710/849be.pdfIn PDF document text
    • http://mklhhhh.space/mcat_past_papers_download_sindhh8pyy.pdfIn PDF document text
    • http://clipshd.design/special_education_planning_templatet0h3r.pdfIn PDF document text
    • http://naturaleone.space/touhoumon_another_worldapn19.pdfIn PDF document text
    • http://neojust.ru/chapter_3_standardized_test_practice_answers_geometry8lmd9.pdfIn PDF document text
    • https://wonakusoxenim.weebly.com/uploads/1/3/5/3/135340368/2467043.pdfIn PDF document text
    • http://reduslim-italiaufficiale.site/business_loan_application_form_templatebkkvp.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/rakabexozu/96500665011.pdfIn PDF document text
    • https://s3.amazonaws.com/mexesazaxasa/tumusakaparejapu.pdfIn PDF document text
    • https://s3.amazonaws.com/banula/bikobija.pdfIn PDF document text
    • https://s3.amazonaws.com/loneminovu/gogilekukozig.pdfIn PDF document text
    • https://s3.amazonaws.com/nuvukivaxiren/learning_spanish_like_crazy.pdfIn PDF document text
    • https://s3.amazonaws.com/xesigeze/fejodukisanan.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_off0000ea3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA3E 5376 bytes
SHA-256: a7a6982a11341fa570a6de36337df32a7cefa586bb9a188fbcb42aed46cad23d
font_01_sfnt_off0000fc90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC90 10432 bytes
SHA-256: b60e17bd55da5be6d8bd7d6ab3f36301585231a7879bc0a01ae661d0aba1c43f

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