Malicious PDF — malware analysis report

Static analysis result for SHA-256 059d438baa18380c…

MALICIOUS

PDF

91.3 KB Created: 2021-03-17 15:54:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 7cc0f45691280b38685b0fb746c55069 SHA-1: 53905cdde978db59483e22e6124519ef495a127d SHA-256: 059d438baa18380cf6fd21ab53e02322a4e471dacd0083044b5433e162e0acf4
186 Risk Score

Malware Insights

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

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 0.9992

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://jottigo.ru/wix?keyword=the+great+gatsby+final+test+answer+key PDF link annotation
    • https://nufusuninad.weebly.com/uploads/1/3/4/6/134609023/tinupapumiwoduw.pdfIn PDF document text
    • http://istlan.space/physiology_book_in_hindi_download5c3vb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451355/normal_603c4276239cf.pdfIn PDF document text
    • http://figuxovutofid.mygamesonline.org/does_warming_beer_ruin_it.pdfIn PDF document text
    • http://tejifepubodol.iblogger.org/what_is_the_salary_of_software_engineer_at_google.pdfIn PDF document text
    • http://reduslim-italiaoficial.site/991363804386rzxt.pdfIn PDF document text
    • http://jiteruruw.sportsontheweb.net/programa_de_estudios_2011_secundaria_matematicas_primer_grado.pdfIn PDF document text
    • http://sewakasatixori.medianewsonline.com/not_about_angels_piano_sheet_music_musescore.pdfIn PDF document text
    • https://xunujigunabiwuf.weebly.com/uploads/1/3/4/0/134017077/5963291.pdfIn PDF document text
    • http://getplafond.xyz/aha_acls_pretest_answers_2015rovt4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4386591/normal_5fcf3e95a264f.pdfIn PDF document text
    • http://copyright-help-report.com/njdep_primary_and_secondary_drinking_water_standards4749w.pdfIn PDF document text
    • https://fubalaxusagipun.weebly.com/uploads/1/3/4/1/134108832/4685717.pdfIn PDF document text
    • https://xitarowax.weebly.com/uploads/1/3/2/6/132681505/javox.pdfIn PDF document text
    • http://kakafeg.scienceontheweb.net/frases_libro_el_caballero_dela_armadura_oxidada.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://jilutuve.rf.gd/46464036500.pdfIn PDF document text
    • http://jerovewoxisabu.epizy.com/inconel_625_sheet_uk.pdfIn PDF document text
    • https://64e18f06-8a0e-4dc1-8427-9dd81b4bff36.filesusr.com/ugd/baa514_48d07e7c2732430a884c958a66f397fa.pdf?index=trueIn PDF document text
    • https://7ef5d8b8-74ac-4e0a-b0a0-fa61ca6462a8.filesusr.com/ugd/23e9be_388350bb198d469fbc166b3c094fac3e.pdf?index=trueIn PDF document text
    • http://sidepojedava.myartsonline.com/bhagwat_gita_in_hindi_book_download.pdfIn PDF document text
    • https://aa700e4b-9450-4a85-8b7e-8c92ffe47626.filesusr.com/ugd/de972d_ee22f2e8cda14d0190f6d8c90aee89ea.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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010713.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10713 6744 bytes
SHA-256: 127b44c9f93874c96d25eb7ddc4688780d8877ce931cf296363fb5748d8d514b
font_01_sfnt_off000117fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117FA 5056 bytes
SHA-256: 2b9931ce5acd125c0e1036c52c9d497c90c45af91eba9ff32095eba669d19f53
font_02_sfnt_off00012934.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12934 11664 bytes
SHA-256: fd6e3b4bbef450ccf5c0b0f46de2afba1a8378c28e821115bdac2de9c89f5c59
font_03_sfnt_off000150e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x150E6 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34