Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b75a6ad114d137c…

MALICIOUS

PDF

79.0 KB Created: 2021-03-31 08:37:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 43eb20e46f93e211a484f1c0e3c55a2b SHA-1: 56cba25652bd54f1e1492f728e738e677c5ce412 SHA-256: 5b75a6ad114d137c873019ef934fcf742ccb32b4d07b5d124044c832410130d0
184 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by multiple heuristics, including a critical finding for linking to known malicious redirector infrastructure. The embedded links, such as 'https://yafferge.ru/wix?keyword=thermal+energy+and+specific+heat+worksheet+answers', are designed to lead users to potentially harmful sites. The document's structure and numerous links suggest a phishing or scam attempt, likely using a spearphishing attachment vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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://yafferge.ru/wix?keyword=thermal+energy+and+specific+heat+worksheet+answers In PDF document text
    • http://bogavevi.22web.org/free_template_daftar_riwayat_hidup.pdfIn PDF document text
    • https://jukaregexiw.weebly.com/uploads/1/3/2/8/132816195/nitamisodagajavavo.pdfIn PDF document text
    • https://cdn.sqhk.co/tuwesedujila/jausTgh/bopum.pdfIn PDF document text
    • http://laxeded.iblogger.org/fiwirevuluzufunasizil.pdfIn PDF document text
    • http://daduriwikoniza.22web.org/full_meaning_of_spreadsheet_in_computer.pdfIn PDF document text
    • https://cdn.sqhk.co/wofazexej/hadhY1D/moseku.pdfIn PDF document text
    • https://tegidaweriwasul.weebly.com/uploads/1/3/1/4/131483440/divizafapi.pdfIn PDF document text
    • https://rolafaxamowoti.weebly.com/uploads/1/3/4/9/134903079/jumerolu.pdfIn PDF document text
    • https://cdn.sqhk.co/lididiregi/bjhIgiw/bujopizeze.pdfIn PDF document text
    • http://bawagel.22web.org/the_forty_rules_of_love_summary.pdfIn PDF document text
    • https://vokedovewugom.weebly.com/uploads/1/3/5/3/135349322/1d1117.pdfIn PDF document text
    • http://sepibuzare.22web.org/philippine_soap_opera.pdfIn PDF document text
    • https://cdn.sqhk.co/rozesivotix/8BidghT/59131028206.pdfIn PDF document text
    • https://cdn.sqhk.co/sobekalob/iibyheC/xexakusakamakuximejik.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
    • http://vezoxonu.epizy.com/adobe_premiere_plugins_free_windows.pdfIn PDF document text
    • http://fanurumuge.epizy.com/reason_for_leaving_job_interview_answer.pdfIn PDF document text
    • http://banidokote.epizy.com/95571040032.pdfIn PDF document text
    • http://tejogasev.rf.gd/unrequited_love_quotes_love_in_the_time_of_cholera.pdfIn PDF document text
    • http://guxenubegipus.epizy.com/bujowenanedu.pdfIn PDF document text
    • http://wezekopufoj.rf.gd/68474757098.pdfIn PDF document text
    • https://s3.amazonaws.com/zopenave/que_significa_inteligencia_emocional.pdfIn PDF document text
    • https://s3.amazonaws.com/kigavanus/xapimixi.pdfIn PDF document text
    • http://dogipozonuxa.epizy.com/43589921495.pdfIn PDF document text
    • https://s3.amazonaws.com/wujixus/microsoft_machine_learning_algorithm_cheat_sheet.pdfIn PDF document text
    • http://jutividaw.rf.gd/busulirawitesupomegomoba.pdfIn PDF document text
    • http://genufewewirim.rf.gd/xofenekekuxozeduwu.pdfIn PDF document text
    • https://s3.amazonaws.com/wewiro/epic_sports_live_apk.pdfIn PDF document text
    • http://xifonefoje.epizy.com/tukavawedodijowedelemok.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_off0000e88e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE88E 5564 bytes
SHA-256: ec06a1d3bd744268197af8a175f22b078747c38e79ff2e3b3fcb7b258b930296
font_01_sfnt_off0000fb66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB66 10568 bytes
SHA-256: 7b120cfb30f2f21c1ee84269df06f0162e46e2fa43d0731c55309048ffc2d828
font_02_sfnt_off00011f9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F9C 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3