Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3274666c660e404…

MALICIOUS

PDF

82.5 KB Created: 2021-06-09 15:34:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 87fcaa17f074e4d8871aee2cfacd78a7 SHA-1: 66a01979389ba9669e17e05376077dc7e46e86c1 SHA-256: f3274666c660e404c2eff81d647af997fe447a26ddb880ac05e45915f3610f34
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a significant number of external links, identified as a link farm. The primary malicious URL, 'https://smidgel.ru/pbw?utm_term=battle+warship+naval+empire+apk+mod', suggests a lure related to game mods. The heuristic 'PDF_SEO_LINK_FARM' indicates the document's purpose is to generate traffic or distribute content through a large number of links, potentially leading to phishing or malware downloads. ClamAV detection further confirms its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://smidgel.ru/pbw?utm_term=battle+warship+naval+empire+apk+mod PDF link annotation
    • https://damelexivukek.weebly.com/uploads/1/3/4/7/134771288/1313855.pdfIn PDF document text
    • https://wefupavoxed.weebly.com/uploads/1/3/2/6/132682659/rivodemazu.pdfIn PDF document text
    • https://kukixagunobi.weebly.com/uploads/1/3/5/3/135325453/1430800.pdfIn PDF document text
    • https://pobanuritixejun.weebly.com/uploads/1/3/4/6/134601578/budepeputolabu.pdfIn PDF document text
    • https://xelasukozulete.weebly.com/uploads/1/3/2/6/132681542/3403746.pdfIn PDF document text
    • https://somejokal.weebly.com/uploads/1/3/4/4/134494219/foxamelowadez-runipog.pdfIn PDF document text
    • https://susemozud.weebly.com/uploads/1/3/2/8/132814624/3188205.pdfIn PDF document text
    • https://duwelebizan.weebly.com/uploads/1/3/4/7/134701088/viseg-polajedisedido-jagavev.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sozevupegufi.pbworks.com/f/tazakoxakon.pdfIn PDF document text
    • http://niwomif.pbworks.com/w/file/fetch/144427908/achyutam_keshavam_radha_krishna_serial_song_mp3_download_pagalworld.pdfIn PDF document text
    • http://lakebimutep.pbworks.com/w/file/fetch/144420897/borderlands_2_salvador_op8_build.pdfIn PDF document text
    • http://foxobekizax.pbworks.com/w/file/fetch/144468180/ruger_sr9_spec_sheet.pdfIn PDF document text
    • http://garewewaziwu.pbworks.com/f/rojuzofepivobakuleded.pdfIn PDF document text
    • http://lovixov.pbworks.com/f/chinnari_thalli_background_music_download.pdfIn PDF document text
    • http://kakexigodelo.pbworks.com/f/descargar_dragon_ball_z_tenkaichi_tag_team_psp.pdfIn PDF document text
    • http://goxuluk.pbworks.com/f/food_vocabulary_list_in_english_download.pdfIn PDF document text
    • http://sufasujozu.pbworks.com/w/file/fetch/144925185/desavudumekalenad.pdfIn PDF document text
    • http://jejosuxiz.pbworks.com/f/galufurilesibuzixamim.pdfIn PDF document text
    • http://xobapotowi.pbworks.com/w/file/fetch/144660735/super_chibi_knight_2_hacked.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dd8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD8C 3668 bytes
SHA-256: a29a4d9638c8314d7e4a274018c98fe552564dd6b51e5547f93043ea861ba273
font_01_sfnt_off0000eaa9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAA9 5464 bytes
SHA-256: b7db34227795dff3e84ed3a8f3c77d39d4941a184404254345914e2569a506c2
font_02_sfnt_off0000fd27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD27 14564 bytes
SHA-256: d0e14e7c04aea08278a60b93dafcc6676d86685a0dc0fb3ea50d15ba4c7545fd
font_03_sfnt_off000126d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126D9 16144 bytes
SHA-256: 2a5f1667c2e343500efde63e3dd6a136498333968b1680966ac5eb34589f1174