Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e51089c872395e9…

MALICIOUS

PDF

82.9 KB Created: 2021-05-03 04:19:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: a2deddd485d8d63897053469048375ef SHA-1: 20c7d98d9f9000fc4c0f93e04988034be0a5ecb4 SHA-256: 3e51089c872395e947fbf6705aeb457d35b82881b2387fa511663b24313a2b16
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URIs, many of which point to disposable hosting and utilize UTM parameters, suggesting a link farm or redirection scheme designed to obscure the ultimate destination. The presence of these characteristics, combined with the PDF's structure, points towards a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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
  • 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/strik?utm_term=descargar+biblia+de+estudio+thompson+gratis+en+espa%25C3%25B1ol+pdf PDF link annotation
    • https://nepuvojikonutoz.weebly.com/uploads/1/3/4/6/134677469/faxakexaforabapu.pdfIn PDF document text
    • https://cdn.sqhk.co/vitimosugu/6hhggBd/uc_browser_apk_install.pdfIn PDF document text
    • http://xagevogewa.medianewsonline.com/47589516245.pdfIn PDF document text
    • http://zutatowatipo.mywebcommunity.org/robert_kiyosaki_cashflow_quadrant_free_download_in_hindi.pdfIn PDF document text
    • https://wemupubipu.weebly.com/uploads/1/3/5/3/135331653/9273067.pdfIn PDF document text
    • https://xizenajagixofus.weebly.com/uploads/1/3/4/6/134657686/7500271.pdfIn PDF document text
    • http://hayatevesigar.online/xexibewoxeroksqm2v.pdfIn PDF document text
    • https://cdn.sqhk.co/rufadexu/f9QjdPr/set_jams_crossword_clue_5_letters.pdfIn PDF document text
    • http://in-step.shop/safusagasjn250.pdfIn PDF document text
    • https://nojesinas.weebly.com/uploads/1/3/0/9/130969722/1853251.pdfIn PDF document text
    • https://dotomogef.weebly.com/uploads/1/3/4/7/134760479/a8ea8419ce54b.pdfIn PDF document text
    • http://afracheat2.xyz/jutabapoti7ym4.pdfIn PDF document text
    • https://cdn.sqhk.co/ziriziwebu/JWjghfE/football_club_president_mod_apk.pdfIn PDF document text
    • http://tuwasukam.getenjoyment.net/advanced_yoga_postures.pdfIn PDF document text
    • https://cdn.sqhk.co/lebogomatoze/jKjfidg/tobotav.pdfIn PDF document text
    • https://cdn.sqhk.co/dukasavubu/efL14Sg/ice_cream_cake_frosting_recipe_baskin_robbins.pdfIn PDF document text
    • http://itclick.pro/asm_handbook_volume_10_free_downloadvmsg1.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/0848e6a0-e36a-4742-9972-1b3fc04a5101/vocabulary_test_questions.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/483c0d13-b299-4117-8fbc-f80afbfad29b/what_washing_machine_does_consumer_reports_recommend.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/70dedf87-859c-4ba4-9b05-890d35691ac6/kexipifowazupe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e424a1e9-2fd4-4680-a9a6-902e65be7d7e/fobaravinovobabimupanisi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bbf626de-3ac0-488e-8c47-83679448d74d/pensar_rapido_pensar_despacio_sinopsis.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
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ecf2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECF2 6744 bytes
SHA-256: b29f9350a720d2da9dc50567d08c4a82684db1fcb28a47e3a5788345b392d808
font_01_sfnt_off0000fdd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDD7 5920 bytes
SHA-256: de84758a1b497939a5cac182937e91b97387af9fac87ae25e395cd630afc42e5
font_02_sfnt_off00011190.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11190 12636 bytes
SHA-256: 19335db1e388d7f892c36e41cf1091eee60d72408dba5dc448e6d6493679b895