Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4cb7eabd8667c63…

MALICIOUS

PDF

69.3 KB Created: 2021-03-31 05:37:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: d1817da54ef7e165a33e6e89787e445e SHA-1: d18d6dffa3582481a8c9862f725e7770845401ee SHA-256: f4cb7eabd8667c63169379594560c4f29154763478bc212e9dc569db5de276fc
184 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious. It contains numerous embedded URLs, with a critical finding indicating a link to known malicious redirector infrastructure at `https://crophysi.ru/wix?keyword=taladro+manual+madera`. The document also functions as a link farm on disposable hosting, suggesting an attempt to distribute malicious content or conduct phishing. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://crophysi.ru/wix?keyword=taladro+manual+madera In PDF document text
    • https://static.s123-cdn-static.com/uploads/4366405/normal_5fe0c7d9c8d88.pdfIn PDF document text
    • http://duwunil.22web.org/13735614002.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4500692/normal_60265b85dd8ee.pdfIn PDF document text
    • http://ukranews.icu/amazing_deals_group_reviews09mw0.pdfIn PDF document text
    • http://aires.fun/zexusubosax2n1.pdfIn PDF document text
    • https://mafobosapufi.weebly.com/uploads/1/3/4/5/134505980/liwokagusiku_japigemudaneto_ponumimiva_roduzenepuf.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470678/normal_5ff92a9e3b79d.pdfIn PDF document text
    • https://gevexivojuler.weebly.com/uploads/1/3/4/4/134444242/risemakeguz.pdfIn PDF document text
    • https://bitigufej.weebly.com/uploads/1/3/5/3/135337089/guxewovemuxip-zozowawa-gojuvelegavu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473616/normal_6051cc25f2ab2.pdfIn PDF document text
    • http://vosipefosorup.iblogger.org/sefofurepuxem.pdfIn PDF document text
    • http://health-top.ru/luvixujomuxufuribagvs3o8.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xirifoxoxoxuxi.rf.gd/muriborafiroja.pdfIn PDF document text
    • https://a0f1d9c0-ea46-4e0e-9383-d87711d3127f.filesusr.com/ugd/1e3fb7_328348e9b355488f9c4c4f5f8e14b887.pdf?index=trueIn PDF document text
    • http://vovugawe.rf.gd/geek_pub_arcade_plans_free.pdfIn PDF document text
    • http://mevediruzorapaz.rf.gd/agenda_escolar_2020_a_2020_preescolar.pdfIn PDF document text
    • https://c06d174a-caca-4ab2-b5a0-4525cd3135d4.filesusr.com/ugd/856cea_4244c9616ae9486c9d504a0c47dcf8e7.pdf?index=trueIn PDF document text
    • https://06ebba1c-c738-45d4-b58d-83edbdcc9420.filesusr.com/ugd/b14caa_22ea757ee60f4df793dd7e3db18c61ca.pdf?index=trueIn PDF document text
    • http://sidujulekefe.epizy.com/webaz.pdfIn PDF document text
    • http://zimakufupakafor.rf.gd/de_que_trata_el_libro_la_riqueza_de_las_naciones.pdfIn PDF document text
    • http://livunox.rf.gd/borobob.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_off0000d1a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1A5 4740 bytes
SHA-256: c28a7252361d81220a5cce40b695de9c4a8446b7135cf310c8f87763e1d97fed
font_01_sfnt_off0000e1a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1A7 11340 bytes
SHA-256: c6b5a46209c0be9ae4f07a68682c28f13469f9e00143b494ea6e2908c476bbc8

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