Malicious PDF — malware analysis report

Static analysis result for SHA-256 4fac3adc7bb4c7c1…

MALICIOUS

PDF

79.6 KB Created: 2021-03-25 02:44:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 941b91378672443939cd738ead905269 SHA-1: 19b4b7c40ba1e7fd8d6f6e7b9006b94db553751c SHA-256: 4fac3adc7bb4c7c1c1558f43ae57316f9ff90a32c670fd7d1737588cd5d66c29
226 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to disposable hosting, characteristic of a link farm or phishing lure. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were directly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to potentially malicious content, possibly for credential harvesting or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 7

  • 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.
  • 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://pelibifir.ru/wix?keyword=marco+mariani+south+bend PDF link annotation
    • http://egosikenclub.com/ys_lacrimosa_of_dana_fishing_guidezoly8.pdfIn PDF document text
    • http://fullpisetc.ru/91629900846erkv7.pdfIn PDF document text
    • http://slimitalia.space/whirlpool_portable_dishwasher_connectorrphwh.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4464083/normal_5ff049309390d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367937/normal_605523494ea55.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4378157/normal_6006d362ad836.pdfIn PDF document text
    • http://instapriz24.site/jijixodl5f5s.pdfIn PDF document text
    • http://on24-system.club/telenovela_a_madrastra_capitulo_603h3sv.pdfIn PDF document text
    • http://ilkertr.shop/how_to_delete_ipod_nano_7th_generationf9hez.pdfIn PDF document text
    • http://mebelrostov.ru/what_is_the_difference_between_nitecore_i4_and_d4jy2fk.pdfIn PDF document text
    • http://stavki.link/isumsoft_zip_password_refixer_registration_keyrx9zb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447465/normal_5fd3c119363d5.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://689a2394-1721-4ce0-b6f7-af9f1dc0d621.filesusr.com/ugd/0f5b72_f9fd740d493640118476b731dd64a69e.pdf?index=trueIn PDF document text
    • https://3568ea06-17fa-4787-91ae-86b9aa918cbd.filesusr.com/ugd/8ade13_b93e0e6a124a46f991f0a24f9ad3952f.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/8a227864-01f4-47f1-8bf7-db909477b028/pak_study_book_9th_class.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/11367a8d-030f-4d13-9517-5f5d0cfdb5b8/36916012294.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b9bd23bf-9cbd-43b8-b921-45827b5eb7b1/zexaridipunogewefetubor.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ea261968-117f-4cba-96a5-78c5ede46578/velocity_vs_time_graph_increasing_acceleration.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f25f783e-992e-47b2-b696-49798510d138/wugifize.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f18d022a-2ae5-4a43-a901-d733f989c82f/gapusidijopirebobeli.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/20cabbe6-1da1-4406-b5f7-a3436cd577fb/81610989907.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7aed114d-2a00-4ad3-8cbb-2fc5a07ef3dc/where_to_study_international_law_in_europe.pdfIn PDF document text
    • https://94db4134-5784-44c5-a63d-963e509970fa.filesusr.com/ugd/9c58c5_9fedfff9a8564159a7460741311ecb19.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/2abc1873-400a-4713-81c6-2c0272d2e087/32331949794.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d163a500-d685-49a5-9e66-cf87bd5ab5a1/cuales_son_los_derechos_humanos_en_venezuela.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_off0000f7de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7DE 5292 bytes
SHA-256: dc0fe9923f2f1989b01a39205380d744d5f4d6d28160aa16ba379a63eb9ead25
font_01_sfnt_off000109b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109B3 11156 bytes
SHA-256: ab4f9794c0bb330715ae5b4db79458f6d6e091664af6c27460d07d26ee508317