Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d170f2da748c876…

MALICIOUS

PDF

78.8 KB Created: 2021-03-21 10:07:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-13
MD5: 6182c966613c3f68d70b155950a8dbc0 SHA-1: ab4e53cc1a40fc692ac273b4ebdfe65c1aacef5c SHA-256: 2d170f2da748c87679a68bed85be203997eddfa144d35aca391f01dd4a7ef76d
184 Risk Score

Malware Insights

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

The sample is a PDF file identified as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs pointing to disposable domains, suggesting a phishing or link farm attack. The heuristic PDF_MALICIOUS_REDIRECTOR_LINK specifically calls out a URL leading to known malicious redirector infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9967

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
  • 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://dafemum.ru/award?keyword=biotechnology+and+food+security+pdf In PDF document text
    • http://jemulobapamiwu.mywebcommunity.org/36792098351.pdfIn PDF document text
    • http://wijofotezopadik.medianewsonline.com/percy_jackson_battle_of_the_labyrinth_movie_release_date.pdfIn PDF document text
    • http://dizititakozazi.mywebcommunity.org/jain_bhaktamar_stotra.pdfIn PDF document text
    • https://jematujevuzonip.weebly.com/uploads/1/3/4/2/134235480/2833fce670b0.pdfIn PDF document text
    • http://dodajavux.scienceontheweb.net/civic_engagement_theory.pdfIn PDF document text
    • https://jidupedepinamup.weebly.com/uploads/1/3/2/6/132680921/vikimowinupoxuwa.pdfIn PDF document text
    • http://rifijetuvijilam.medianewsonline.com/xexuxi.pdfIn PDF document text
    • https://lapawiniposa.weebly.com/uploads/1/3/5/3/135323982/739eb2cea7aab.pdfIn PDF document text
    • https://xebubezapabiw.weebly.com/uploads/1/3/5/3/135327697/pofozojav.pdfIn PDF document text
    • https://cdn.sqhk.co/wizokawoxo/dhcjdib/votokunufadaluxave.pdfIn PDF document text
    • https://cdn.sqhk.co/vasinabew/iczjgia/buildings_for_minecraft_pe_pro_free.pdfIn PDF document text
    • http://luwogexejel.getenjoyment.net/i_am_lucky_poem_class_2_lesson_plan.pdfIn PDF document text
    • http://jadogaxarabu.mygamesonline.org/come_home_to_roost_idiom_meaning.pdfIn PDF document text
    • http://mojadejazisapa.sportsontheweb.net/bluedio_ufo_plus_pro.pdfIn PDF document text
    • https://mufosuxid.weebly.com/uploads/1/3/4/0/134040625/velerisawusugeli.pdfIn PDF document text
    • https://cdn.sqhk.co/genedofe/bvidjgg/binomische_formeln_bungen_klasse_11.pdfIn PDF document text
    • http://gagivukamuw.getenjoyment.net/free_math_worksheets_for_2nd_grade_addition.pdfIn PDF document text
    • http://setopin.mypressonline.com/bhagavad_gita_in_telugu_online.pdfIn PDF document text
    • http://davorivugexawu.sportsontheweb.net/81254615228.pdfIn PDF document text
    • http://retapadu.medianewsonline.com/biwaravisubit.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/52493e67-6fea-4479-9f45-57c850fa572d/the_scientific_approach_to_intermittent_fasting_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d756b584-da44-4c75-b039-977a2f051506/simpson_3300_pressure_washer_parts_diagram.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a94a03e4-f782-4d6c-84ed-cae1dd269600/fomuzux.pdfIn PDF document text
    • http://kagijido.myartsonline.com/english_language_gcse_revision_guide.pdfIn PDF document text
    • http://koriwironawuva.myartsonline.com/scanner_canon_lide_220_fiche_technique.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0e27bdab-2d4d-4295-8727-b2df64b859c0/how_to_develop_a_program_evaluation_plan.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_off0000f2e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2E0 5568 bytes
SHA-256: b1d38b40a38a55a7d38047da59bbc7750f2fbbb4f606b9b3bb0fcead76419f56
font_01_sfnt_off000105db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105DB 11780 bytes
SHA-256: e97f4965e337a957dd4c28dd843a01d661dbe59b70261eabc8df919e7bd82c5a