Malicious PDF — malware analysis report

Static analysis result for SHA-256 78e66033d53a85dd…

MALICIOUS

PDF

65.6 KB Created: 2021-03-15 14:26:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-28
MD5: aaf7962220e3a59265f7b8e2ad14e0c7 SHA-1: 50b4f672b8bea9625687d23ff054f03a3624c93a SHA-256: 78e66033d53a85dde27d5305ca3552436fea863582ce2e9d03b8a4d9316f6a2d
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains, and is flagged by heuristics as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were extracted, the structure and embedded links suggest an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://golowaki.ru/wix?keyword=gm+map+sensor+seal PDF link annotation
    • http://linavaluviriv.getenjoyment.net/what_is_the_meaning_of_social_contract_theory.pdfIn PDF document text
    • http://bexemusu.mypressonline.com/baretegidikemumat.pdfIn PDF document text
    • http://lofoporubatul.mygamesonline.org/the_gift_of_the_magi_worksheet_answers.pdfIn PDF document text
    • http://tikanaw.mypressonline.com/51634487608.pdfIn PDF document text
    • http://juwoniki.getenjoyment.net/ensayo_sobre_alimentos_transgenicos.pdfIn PDF document text
    • http://towufato.mywebcommunity.org/fekedawipu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/zemunomipazikez/sezogenabo.pdfIn PDF document text
    • https://5a4e7950-e122-4b3c-9cf7-894e7f5b1216.filesusr.com/ugd/76aeb6_363c3f93ca3f4404967954efcb16921b.pdf?index=trueIn PDF document text
    • http://fojakosi.atwebpages.com/13705112340.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0732ec7f-b2af-46e2-b252-270f91866d81/nobelavetefe.pdfIn PDF document text
    • https://df256b98-640c-444d-885a-8195c7360722.filesusr.com/ugd/40b9e6_5cf6e75287ed4daf8fc4e29d0d6ad517.pdf?index=trueIn PDF document text
    • http://medexode.atwebpages.com/agenda_2020_imprimir.pdfIn PDF document text
    • http://nogafojomor.onlinewebshop.net/company_email_id_list.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/72950975-9ffa-40fe-b816-ef4acbc3da98/bissell_little_green_proheat_carpet_cleaning_machine_2513g_reviews.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d76fd9d0-5d93-46d4-9a4e-bf3348911ced/zafono.pdfIn PDF document text
    • https://s3.amazonaws.com/kakekojezutok/cracked_software_virus.pdfIn PDF document text
    • https://4f65501f-cdae-4966-b9db-49b15ad9d196.filesusr.com/ugd/52b593_005f79ef4e004cac866c91588afdbcab.pdf?index=trueIn 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_off0000c3e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3E2 4996 bytes
SHA-256: c5187042a896085776c492c794a4b32ad6e1404b08ea4f0c2275cf4a7738bac2
font_01_sfnt_off0000d4c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4C8 10924 bytes
SHA-256: e73d2b0d88a5495bd129d5964a1013e4b3eb61e9be725b8fafaef10921c8e989

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