Malicious PDF — malware analysis report

Static analysis result for SHA-256 2543fe8f537fea3d…

MALICIOUS

PDF

77.8 KB Created: 2021-04-07 19:03:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 76c02ecf0a45df30ab42bc8bc18b3427 SHA-1: 0e2dcfd3f229fe466c1a6cd1be975ac8150a5406 SHA-256: 2543fe8f537fea3de1bb599f6a1f6eab18deb2fb54c2572889b6d7f529fd7abb
166 Risk Score

Malware Insights

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

The PDF contains numerous external URIs and is flagged by ClamAV as Pdf.Phishing.Trojan. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' suggests the document may be part of a multi-stage attack, potentially providing a password for a separate malicious archive. The ML classifier output of 0.999270 further supports a malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://bologen.ru/strik?utm_term=does+kindle+have+a+lending+library PDF link annotation
    • https://cdn.sqhk.co/jasekazus/eaChahk/56876418721.pdfIn PDF document text
    • https://cdn.sqhk.co/wigatozaduw/nggijBl/37740997892.pdfIn PDF document text
    • http://socialwave.me/58150514482jrvm3.pdfIn PDF document text
    • http://geleostone.online/ant_er_addon_for_firefox2sdm4.pdfIn PDF document text
    • http://xeeewq.xyz/58153792646ov7.pdfIn PDF document text
    • https://cdn.sqhk.co/tamejenonisi/jVqytuc/small_business_board_of_directors_compensation.pdfIn PDF document text
    • http://prizinsta.online/sashiko_tutorialpl46i.pdfIn PDF document text
    • https://cdn.sqhk.co/xudekutof/hdJbahR/18564255657.pdfIn PDF document text
    • http://hookup157.site/arnie_the_doughnut_worksheetswo2mf.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/1f4c322c-4464-450d-8c34-cbcab9bce466/ms_word_hindi_font_download_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/74242435-393b-48f9-8fb2-d20311c58db2/faruparu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/060d75f0-30e1-4a95-b68d-5eda9a916a77/jafogetedulekivodu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8d0df82f-b2c0-4068-b5a5-c0d6059b127e/que_hace_un_mecanico_de_mantenimiento.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e74a0aa1-185c-4188-b1cd-044e8129681a/finders_keepers_documentary_full_movie.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bde17355-6d14-4221-b877-0e90685caf13/varozukolag.pdfIn PDF document text
    • http://jokosalona.epizy.com/velumijoseduluda.pdfIn PDF document text
    • http://pugagewuda.rf.gd/dowopovaso.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d88a9968-1a0a-4660-8250-3b58dd083469/48846541514.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/382e2085-1d57-43c0-924f-3563a1038ac1/losudafefizelonurij.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8ab36960-c0c7-41d3-9268-188bbd922998/20433707350.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a5c9c49d-c2df-4b69-b427-224043848e70/pejafenoxovigufutevusiwuz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0d5623f6-be16-4513-a072-21a2eb98ae3b/60472258774.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c8de0aa7-ed5a-4901-88b8-6a2283abed60/united_states_army_recruiting_office_near_me.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_off0000f0b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0B2 5452 bytes
SHA-256: d8c44ca00a0af3af045a1da04f931afc44877b91abcdb24a0a74eb9c667e7318
font_01_sfnt_off00010344.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10344 11148 bytes
SHA-256: 1c6aec1c5a2d3e7989c0d8f4f1dd518428819ddfdf939ec14e97cde5316bb5c8

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