Malicious PDF — malware analysis report

Static analysis result for SHA-256 729b30e73f10fda0…

MALICIOUS

PDF

78.5 KB Created: 2021-03-30 00:30:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 4da315c8510e1257c6ca0daed81bd1f7 SHA-1: 88393d5f481e289f3b8eed8046c9ef22fe19cbb9 SHA-256: 729b30e73f10fda0b6a052b408933cd77349c961c5c69ce9131b1f44804732fc
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 0.9996

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://resalured.ru/award?keyword=diccionario+biblico+nelson+pdf+gratis PDF link annotation
    • https://lenapejasuma.weebly.com/uploads/1/3/4/7/134749539/gezutaxotaveranar.pdfIn PDF document text
    • https://cdn.sqhk.co/medukukekuke/FibS6id/origami_box_easy.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4415065/normal_6002ea4cdf6ea.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403820/normal_5ff120dcd3e06.pdfIn PDF document text
    • http://nasporte1.fun/consumer_reports_best_stick_vacuumgg81s.pdfIn PDF document text
    • https://topifovav.weebly.com/uploads/1/3/4/5/134595147/furupudibudixin_vasizuwalike_xinipemeno.pdfIn PDF document text
    • https://cdn.sqhk.co/xosuridasago/akCBKah/39925089502.pdfIn PDF document text
    • http://zdsshop.top/49188150271u726d.pdfIn PDF document text
    • https://cdn.sqhk.co/tedubifo/CX4jelh/driving_school_simulator_2016_pc_download.pdfIn PDF document text
    • https://cdn.sqhk.co/difixoruze/Tiboic7/3126126027.pdfIn PDF document text
    • http://socialwave.me/13030121918sbdmb.pdfIn PDF document text
    • http://mail-autoscout24.net/kasibabutugowipezolazik19mzl.pdfIn PDF document text
    • https://pudajimerexinag.weebly.com/uploads/1/3/4/8/134896131/xoveg_lexagozakus_gejitexu_jutaseneseb.pdfIn PDF document text
    • https://cdn.sqhk.co/jovowosifo/b4gjYjh/best_3_star_army_clash_of_clans_th9.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
    • https://s3.amazonaws.com/gogunabones/31867572771.pdfIn PDF document text
    • https://s3.amazonaws.com/jupudizadid/bioscope_apps_link.pdfIn PDF document text
    • https://s3.amazonaws.com/lomuper/11846860541.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off0000fe6e.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xFE6E 18780 bytes
SHA-256: b76ca9265718a30198228eeca84aac52ccf8454be9896415e270b325f702c4fa
font_00_sfnt_off0000c485.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC485 5252 bytes
SHA-256: 8ebffbb503a16d2948307a6a97b26824364d584457caf588de598a56573f0da6
font_01_sfnt_off0000d65d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD65D 12932 bytes
SHA-256: eba4ed25d8e15936d4cdecc853013fbfb6bc6496c307051a8f23795b8f2a6cd5
font_03_sfnt_off00011cca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CCA 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3