Malicious PDF — malware analysis report

Static analysis result for SHA-256 dcb63cc0e8653ad8…

MALICIOUS

PDF

74.4 KB Created: 2021-04-04 00:04:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 0c7e35df597660c7e16885c3cf3ebd74 SHA-1: 1dd651ecce7929893110c056a2c524b75cf9d28e SHA-256: dcb63cc0e8653ad86d16839eee1513af36792b56b954a1f9dc1d2afdcc08ad08
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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://jottigo.ru/123?utm_term=reporting+factorial+anova+results+apa+style PDF link annotation
    • http://zesisoxesevi.22web.org/jebokupi.pdfIn PDF document text
    • http://rumafelaneli.mygamesonline.org/pengertian_jantung_koroner.pdfIn PDF document text
    • http://difijeso.iblogger.org/bosquejos_para_predicar_en_celulas.pdfIn PDF document text
    • http://nawireg.22web.org/char_broil_performance_4_burner_replacement_parts.pdfIn PDF document text
    • http://smartbright.club/are_arms_attractive1cd62.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4484154/normal_5fec881f5a6d9.pdfIn PDF document text
    • http://nubekamejulug.iblogger.org/sasuvogowe.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4487187/normal_5ff2aab58efc6.pdfIn PDF document text
    • http://foyou.store/sql_formatter_sql_developermjdd5.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/6805c2df-6cc6-46bc-adc5-01158e06ad2a/beethoven_sonata_op_109_no_30.pdfIn PDF document text
    • http://vedisupekak.epizy.com/80164433737.pdfIn PDF document text
    • http://xafupuzekiv.rf.gd/xiruzuwereroramixaluxebe.pdfIn PDF document text
    • http://guwajogijifode.rf.gd/2d_game_kit_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/13a6fd48-76bf-47e9-8159-ff680211cf82/pablo_escobar_mi_padre_descargar.pdfIn PDF document text
    • http://gagolugumetuvo.epizy.com/48098406122.pdfIn PDF document text
    • http://jezevenakos.myartsonline.com/oedipus_rex_movie_2008_trailer.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_off0000e440.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE440 5352 bytes
SHA-256: 2f93361ad7b2b3024b030070b76cb39514e1b01d99b0beca62167e955329d8b2
font_01_sfnt_off0000f6a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6A2 11320 bytes
SHA-256: 0e986c79c251f24903da9504e978d8f0f16fa56a721dedf6eba4dfa3b6a37fdf