Malicious PDF — malware analysis report

Static analysis result for SHA-256 8464acea983c2e5b…

MALICIOUS

PDF

97.1 KB Created: 2021-04-09 01:33:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 8ac0e7aab8bcac74767efa7ea77d8c89 SHA-1: 48e7e4bcae8e31a8e5e1cc05989e96e5d4a09bc5 SHA-256: 8464acea983c2e5b07b08f536d201cccb8eac0adbf78cba27baf317fac769821
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable domains and are structured to appear as search results or file downloads, indicating a phishing or scam attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a phishing lure, likely leading to further malware or credential harvesting.

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://maypoin.ru/strik?utm_term=what+is+the+purpose+of+complexity+in+academic+writing PDF link annotation
    • http://sweetmeet.online/bedtime_stories_movie_australian_ratingz71c0.pdfIn PDF document text
    • http://uplrezina.site/boa_vida_healthcare_reviewsndpu6.pdfIn PDF document text
    • http://thesimplycompleteseries.com/81847375074p68vt.pdfIn PDF document text
    • http://zeropium.com/17124228267gpv9v.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4382423/normal_5ffa57e026a39.pdfIn PDF document text
    • http://form-lnstagramcopyrightservices.com/aviwest_pro380omlpa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4527747/normal_5fc90704d12d7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450907/normal_60324e648c0af.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459464/normal_605f63c31a584.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369651/normal_6038693123b19.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380545/normal_60485f672695f.pdfIn PDF document text
    • http://helplnstagramcontact5087423.com/berevawelixaribpeoc.pdfIn PDF document text
    • http://serdyukov.pro/b_arch_previous_year_question_paper_download5i8ue.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409610/normal_605d6af7c3591.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4411917/normal_6001163d1b176.pdfIn PDF document text
    • http://mavito.online/rulurigeviguvopowexuxe6gxjs.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467043/normal_601a74a2ae3eb.pdfIn PDF document text
    • http://hytri.com/what_is_the_electrical_outlet_in_costa_ricawgm65.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446635/normal_5fd1d8efdc2e5.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://76c87692-cca9-4651-be8e-de6412dad411.filesusr.com/ugd/fdad67_5b1c10f5ba84431ab77a7a1f8fc4da0e.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/a2223dbf-4fde-42ab-bf36-e012c0d05a48/skywalker_trampoline_15_ft.pdfIn PDF document text
    • https://b064d0e4-88d6-4b7e-8087-8ebf790fcba6.filesusr.com/ugd/ca32a8_b78acae25a82472ab7f46509258dabbf.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/daa48570-ac9b-4b36-8904-1431f4d0e0c1/does_ahsoka_tano_have_a_child.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_off00011eec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EEC 5724 bytes
SHA-256: f219cab747779b1c069133a8c40d9bd6f54e271b2d3e1ee3143d636c0d3dff18
font_01_sfnt_off00013266.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13266 17568 bytes
SHA-256: 32b09ad12372cb0508e88ebcf4fd6c8b3e0d4f3a89ab3d0f2d1df761c9739c63
font_02_sfnt_off0001689a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1689A 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333