Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1111c72d3a7b25c…

MALICIOUS

PDF

71.9 KB Created: 2021-03-03 00:10:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 244ee6c4eaa857d6f6deba1b85bc3993 SHA-1: 88d3982b269c8beb2ded5b2529ccd26fe747bd5f SHA-256: a1111c72d3a7b25c31014baf2537972200b3801dd7f0f9d803f8637e1d2e0bae
126 Risk Score
Tags
free-cdn-ebook-manual-lure

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 0.9996

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://kuzutuzo.ru/123?utm_term=fl+studio+producer+edition+cheap PDF link annotation
    • http://zevixoleg.iblogger.org/13892983189.pdfIn PDF document text
    • http://kolomata.ru/altec_lansing_mini_life_jacket_3_wont_turn_on6ew47.pdfIn PDF document text
    • http://rezonansmusic.com/wuxizuml5uv.pdfIn PDF document text
    • http://datingdate.site/darexuwikilivixizazita9trd1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495684/normal_6011e52403f80.pdfIn PDF document text
    • http://chempion.coffee/splash_brushes_for_photoshop_cs6_frees4z16.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4422392/normal_5ffc15badc1fd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445103/normal_603b630845ded.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450889/normal_601952f4b1d88.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388174/normal_5fdb5463a41e9.pdfIn PDF document text
    • http://remontvorot24.com/simple_nursing_assessment_formw3w1n.pdfIn PDF document text
    • http://bridgecommerce.com/917254811125s7a0.pdfIn PDF document text
    • http://winclean-shop.space/android_chat_application_using_xmpp_tutorialjew4e.pdfIn PDF document text
    • http://fesupopimos.66ghz.com/sap_mm_certification_questions_answers_and_explanations.pdfIn PDF document text
    • http://libralab.digital/what_are_the_seven_basic_needs_of_all_living_thingsbmyqr.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/dudujopixejikug/58070752878.pdfIn PDF document text
    • https://s3.amazonaws.com/gagagakigibapo/airflow_jinja_template_not_found.pdfIn PDF document text
    • https://s3.amazonaws.com/papuja/flagler_sheet_metal_machinery.pdfIn PDF document text
    • http://wafugid.epizy.com/que_es_el_canvas.pdfIn PDF document text
    • http://todizegi.epizy.com/20711858930.pdfIn PDF document text
    • https://s3.amazonaws.com/resixexi/european_commission_bulgaria_report.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ce81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE81 4996 bytes
SHA-256: a24038cccfeaae264358df7d1b0a52e9368021a74e8676e7c4561e1ae8957394
font_01_sfnt_off0000df6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF6A 10320 bytes
SHA-256: b538d74bb63fabee8964a6d0c24523e984497c939598782245e3c68da613ed77
font_02_sfnt_off000102b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102B5 4324 bytes
SHA-256: ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230

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