Malicious PDF — malware analysis report

Static analysis result for SHA-256 c21be9b6e8035f73…

MALICIOUS

PDF

75.2 KB Created: 2021-05-22 05:59:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 0f75c34a414dbbc41147afb42527c0ba SHA-1: eab38acbce65406cffdcba8bed16ddfdf394b942 SHA-256: c21be9b6e8035f736d6b5339c8656ada8bb0b89a138586e025e9bdbd27789e0d
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

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 0.9999

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://leonvi.ru/strik?utm_term=felsefe+performans+kapa%25C4%259F%25C4%25B1 PDF link annotation
    • https://lunipudazu.weebly.com/uploads/1/3/4/4/134462877/kegegamagu.pdfIn PDF document text
    • https://jotowaviroretog.weebly.com/uploads/1/3/4/6/134604658/9237927.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/sefepugolupalax/35062304743.pdfIn PDF document text
    • https://s3.amazonaws.com/kukazowox/cbse_class_10_2020_exam_date_sheet.pdfIn PDF document text
    • https://s3.amazonaws.com/tikofaketonub/angry_babies_film_songs_free.pdfIn PDF document text
    • https://s3.amazonaws.com/xotomisen/the_death_of_ivan_ilyich_audio.pdfIn PDF document text
    • https://s3.amazonaws.com/zibenoroduzuw/california_pest_control_applicator_test_study_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8c9a547b-bd23-4e6f-b663-e559165b536d/jawekuvoxukadumir.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ae7609df-aa66-4c58-bd72-56a451911a46/xuminug.pdfIn PDF document text
    • https://s3.amazonaws.com/fizup/90723756481.pdfIn PDF document text
    • https://s3.amazonaws.com/rujimidujek/guitar_chords_book.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b1e1e36f-dcfb-4ec0-bde4-17a8220b8986/joxavamesufewunaje.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b8074667-b8b9-4eea-82bb-b47d913af8a6/ionic_pro_90ip01mi01w_black_compact_ionic_air_purifier.pdfIn PDF document text
    • https://s3.amazonaws.com/dovulavavo/79273175669.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ac2162fb-d2c1-4f26-b124-57efa94e1507/mokujovin.pdfIn PDF document text
    • https://s3.amazonaws.com/budovewesekaz/82490925815.pdfIn PDF document text
    • https://s3.amazonaws.com/sefiwegegagu/14280126055.pdfIn PDF document text
    • https://s3.amazonaws.com/muwomapotumugi/52814200016.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_off0000e5e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5E8 5328 bytes
SHA-256: 6d28aaf03ffa309269b491023424cbb3d89f87179f7fdbc62d02dc234dace77b
font_01_sfnt_off0000f7fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7FB 12252 bytes
SHA-256: 453936db54d20cb403b4c74cc05dd09ebd9732a0d5e1476bd5a2afce95545113

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