Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab1603c4010082a9…

MALICIOUS

PDF

74.0 KB Created: 2020-12-04 09:40:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 8c638aa2b611c93508b959757da59be0 SHA-1: 8f301881087d2b27f6db78fe158d622fbd6cded7 SHA-256: ab1603c4010082a9d62a20d403f46a5c5ff971b47d2b14f0411804fbaa87d230
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 0.9998

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://traffnew.ru/strik?utm_term=sinusoidal+models+word+problems+answers PDF link annotation
    • https://bosaralox.weebly.com/uploads/1/3/4/6/134608385/madulelej.pdfIn PDF document text
    • https://gasipepimajut.weebly.com/uploads/1/3/4/3/134367512/tusamebofagotilomes.pdfIn PDF document text
    • https://wugowimuvup.weebly.com/uploads/1/3/4/7/134762233/4179875.pdfIn PDF document text
    • https://radamafusutu.weebly.com/uploads/1/3/4/6/134668344/dikifizotubikanagis.pdfIn PDF document text
    • https://juragubiv.weebly.com/uploads/1/3/0/8/130874328/8016999.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/zategafozasiru/lower_back_exercises_nhs.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/75166abb-cc14-490c-8d41-551a637f977f/9.1_practice_a_geometry_answers_page_291.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f4dfe547-4762-4c43-99f2-91cc297751e8/rojosofirudiziruw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9faf210c-f272-4b62-aed4-50bb8d531029/human_resource_management_mondy.pdfIn PDF document text
    • https://s3.amazonaws.com/domegagowevag/servsafe_manager_7th_edition_download.pdfIn PDF document text
    • https://s3.amazonaws.com/joterige/medieval_leather_armor_patterns.pdfIn PDF document text
    • https://s3.amazonaws.com/niwotipugonuvoz/study_island_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/jinabom/73433899955.pdfIn PDF document text
    • https://s3.amazonaws.com/bajapovogam/ibis_paint_x_download_for_android.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f5bde5d0-1a9d-4bc3-a765-27392b5b19dc/contoh_format_surat_lamaran_kerja_doc.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_off0000e366.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE366 5440 bytes
SHA-256: faddef99e30b30bfbaa04bf0b17cfc4d385a81367fbed71e4674d3c54a7e593f
font_01_sfnt_off0000f5d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5D4 11084 bytes
SHA-256: 77d2f225129bf7c111d7c53e6fd3afe9eb05919ca9d9848b2437a5effe0a5e95

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