Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f2492d7805c7668…

MALICIOUS

PDF

81.3 KB Created: 2021-03-20 06:35:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-13
MD5: 2247674c197c35e06820afc6e2dc6cf2 SHA-1: b74c5b9b889a7051208e6c8584b6d14b3db02cc7 SHA-256: 3f2492d7805c766885667341f120a75f96ae76136a29d6d28a9784ab52ba1187
126 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating it is a phishing trojan. It contains numerous embedded URLs, with a primary one pointing to 'https://maypoin.ru/strik?utm_term=how+to+write+greek+symbols+in+latex', suggesting a lure to a malicious site. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports its nature as a link farm on disposable hosting, designed to distribute malicious content.

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
  • 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://maypoin.ru/strik?utm_term=how+to+write+greek+symbols+in+latex PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4371783/normal_600e621941643.pdfIn PDF document text
    • https://cdn.sqhk.co/ganidabizi/gfZhjB9/xosimomiguw.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387931/normal_6015c638498a6.pdfIn PDF document text
    • http://eurozone.pro/alesis_turbo_mesh_kit_manual7rhxd.pdfIn PDF document text
    • https://cdn.sqhk.co/jarebomu/eKSihid/bajawisibu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462678/normal_6049598ea40f9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410006/normal_6033c9c91bfdf.pdfIn PDF document text
    • http://visiblawty.com/solvent_extraction_organic_chemistry_lab_reportqy1mb.pdfIn PDF document text
    • http://kengoru.space/2367498198m7bo9.pdfIn PDF document text
    • http://bowoporoj.iblogger.org/wizard_of_oz_music_writer.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://mofibukuzoke.rf.gd/vimeo_er_ios.pdfIn PDF document text
    • http://pegawatovejugav.epizy.com/jefofijenud.pdfIn PDF document text
    • http://dezezefisimel.rf.gd/72710980537.pdfIn PDF document text
    • https://6ddb26ad-aa8e-4a3e-a925-5cef6fc035e1.filesusr.com/ugd/d3d820_f26d6169573b4a6c8f839725058729f0.pdf?index=trueIn PDF document text
    • https://e148473a-3d1a-46f8-b788-fbc1f5af68d4.filesusr.com/ugd/e1e70b_47d060cbaf304df091ddf1b103571893.pdf?index=trueIn PDF document text
    • http://kilizamigikulut.epizy.com/mopija.pdfIn PDF document text
    • http://jegowijuvu.epizy.com/complete_anatomy_3d4medical_android.pdfIn PDF document text
    • http://fufabufitilaf.epizy.com/gambar_animasi_bergerak_lucu_banget.pdfIn PDF document text
    • http://bejitepirisobi.epizy.com/android_analog_clock_with_second_hand.pdfIn PDF document text
    • http://lotuseposan.epizy.com/39628298303.pdfIn PDF document text
    • https://6196a4e6-b3b5-4a85-a139-4ec84e0a53d9.filesusr.com/ugd/d01287_c172045d908c41d1b05717a515ffe92f.pdf?index=trueIn 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_off0000ecbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECBF 5432 bytes
SHA-256: ea491890180506188e7d45bc61e4dbb466be19bfc24d9c79635ebc5986f81035
font_01_sfnt_off0000ff3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF3F 16372 bytes
SHA-256: de0f1751087c2f011af852575c80383437a95240a7022f55f4960aad91cff51e

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