Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ca13983a04098aa…

MALICIOUS

PDF

79.8 KB Created: 2021-03-13 22:11:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-20
MD5: 03781ac728425a5786a2ba5f0c0e0f90 SHA-1: ca81c53597d64e5ed201814c1d1d88bead78d337 SHA-256: 7ca13983a04098aafd1fb61c40fde8ec46a993943c5df6a0e3d842cc194e4d4e
126 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many of which are hosted on disposable domains and appear to be part of a link farm designed to obscure the true destination. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The presence of obfuscated text and the use of external URIs suggest an attempt to trick users into downloading a payload, aligning with spearphishing tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://soxebez.ru/123?utm_term=apache+maven+3.+3+3++for+windows PDF link annotation
    • http://ig-copyrightnotice.com/mini_speaker_ws-887_charging_timerlwpw.pdfIn PDF document text
    • http://help-nanny.site/vipegiletesemob6zqph.pdfIn PDF document text
    • http://sudilufib.getenjoyment.net/convert_adobe_to_word_document_free.pdfIn PDF document text
    • http://ampinternational.org/report_anti_social_behaviour_scotlandtpamb.pdfIn PDF document text
    • http://rirelavemug.iblogger.org/motorcycle_keihin_carburetor_tuning.pdfIn PDF document text
    • http://wisecredit.info/wahl_clipper_corp_sterling_il_usa_model_8081kww07.pdfIn PDF document text
    • http://mavigawika.scienceontheweb.net/92317127806.pdfIn PDF document text
    • http://sdfsdfsdf.shaketorch.com/55933375638.pdfIn PDF document text
    • http://xorabawik.medianewsonline.com/fitawifa.pdfIn PDF document text
    • http://xsafak.com/paquet_entrept_laiss_sheintdtxe.pdfIn PDF document text
    • http://unityfree.xyz/wagafulabogogesudawudobai29fc.pdfIn PDF document text
    • http://reform-st.ru/gutonujomuwadeqb6a.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/lumixi/beliluw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e7b78918-d479-4db5-ba83-de3a0c0b6883/xopunufozafojonefuzok.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/69fd4446-ddfe-4708-bc68-744604d11809/yamaha_rx-v373_bluetooth.pdfIn PDF document text
    • http://zumijuxuv.epizy.com/securecrt_free_for_windows.pdfIn PDF document text
    • https://s3.amazonaws.com/tujeviwakirawu/bakra_eid_mubarak_images_2019.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5c322621-2267-4205-93e6-fd7b118b1409/37151050208.pdfIn PDF document text
    • http://rogitini.epizy.com/83583004746.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4256498f-39f5-49fd-8949-daeedfaf43f1/peteb.pdfIn PDF document text
    • https://s3.amazonaws.com/davolazupivowi/42172689140.pdfIn PDF document text
    • http://mepulufe.epizy.com/how_to_write_an_army_policy_letter.pdfIn PDF document text
    • https://s3.amazonaws.com/vabemavuputenif/gotedozurubudosodumezubo.pdfIn PDF document text
    • https://s3.amazonaws.com/kegubinefuda/former_auditor_general_kenya.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e891.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE891 5408 bytes
SHA-256: fb833dbdace3779635824b3e56f62a76d0473eab0aa24cd74318702cf63c8b45
font_01_sfnt_off0000fadb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFADB 11984 bytes
SHA-256: ad02b5db87a73491754466b9763feb888935669224c225a4599045d9d28ccfaf
font_02_sfnt_off00012386.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12386 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2