Malicious PDF — malware analysis report

Static analysis result for SHA-256 e81f4857ef951976…

MALICIOUS

PDF

100.6 KB Created: 2021-03-26 09:56:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: e779b8a465b8e53a9fcc962257a3cd41 SHA-1: 0782454cc8416d0e43323095dd75e9dea478ea49 SHA-256: e81f4857ef95197600a14527a380deaed52b08b3b695dd3a79a42cc33b88d3bf
186 Risk Score

Malware Insights

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

The PDF contains numerous external links, many hosted on disposable domains, indicating a link farm designed to redirect users to potentially malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards an attempt to leverage external resources for malicious purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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.
  • 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=ultimate+fallout+3+setup+and+mod+guide PDF link annotation
    • http://lefejot.22web.org/beginning_english_worksheets.pdfIn PDF document text
    • https://cdn.sqhk.co/zidexamuwela/fgeLlge/truck_driver_city_crush_mod_apk_hack.pdfIn PDF document text
    • https://cdn.sqhk.co/peruvereraba/iajhghC/offshore_fishing_report_gold_coast.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379842/normal_60170be08208b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4414871/normal_60006999bc889.pdfIn PDF document text
    • https://cdn.sqhk.co/nelufebo/hhcpjhc/yorick_urf_guide.pdfIn PDF document text
    • https://cdn.sqhk.co/varomapit/RwihjhW/dinosaur_battle_world_championship_wiki.pdfIn PDF document text
    • https://cdn.sqhk.co/xumifutave/gjIiiih/xiboze.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458145/normal_602414719922b.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://4c72699b-aa2e-4dc8-8bd5-1a54e8f938a6.filesusr.com/ugd/f3cb45_b6bfc394394d4dd183753943298c84da.pdf?index=trueIn PDF document text
    • https://2eda13a9-9e0f-47dd-bbfa-a9a5028a3314.filesusr.com/ugd/61c57f_8a3b7038e1a846e9acd63a6a19eb3e35.pdf?index=trueIn PDF document text
    • https://18aefb47-0221-41c7-ace0-4f78eb33e730.filesusr.com/ugd/bca722_38d5d8275939401fb658d65ab28dae17.pdf?index=trueIn PDF document text
    • https://8d59741e-369e-44be-b01e-8fbcb09d2d01.filesusr.com/ugd/7cefa9_753f8b54fc5a4aeaa5abed3431daa2d8.pdf?index=trueIn PDF document text
    • https://5366dd3f-28a3-4342-b8e5-5bed86455aec.filesusr.com/ugd/a92322_9dc8fa7652e746379c929d69f376917b.pdf?index=trueIn PDF document text
    • http://badisaxutut.rf.gd/descriptive_essay_topics_for_class_9.pdfIn PDF document text
    • https://51da6a7d-ee05-4a49-87ee-1b74af3aeb07.filesusr.com/ugd/b80405_688edfa3d9b54408b75cfa05975a544b.pdf?index=trueIn PDF document text
    • https://f2f8a3c9-3ea7-4a25-b7e2-3e2749f32899.filesusr.com/ugd/f0e51d_0eea3f4aac72492ea35d48be0c87974c.pdf?index=trueIn PDF document text
    • https://d12d056d-c16f-42d2-bb36-b12dbd13f8e5.filesusr.com/ugd/a2005d_e11f496837984957a18793e37a820ac0.pdf?index=trueIn PDF document text
    • https://bf5f3f24-cfb9-4aec-9f01-83e6d863dc5b.filesusr.com/ugd/1f4526_3714c5aaa3384de787d046e4eeb05e24.pdf?index=trueIn PDF document text
    • https://a7193630-a032-4ee2-b136-33837135b76a.filesusr.com/ugd/fac845_00b3fec995da479eb8527dabbf7bb24f.pdf?index=trueIn PDF document text
    • https://5fa60de5-32ab-41ac-ba65-77330e21e623.filesusr.com/ugd/2e16aa_a82cdf333dc145aa952b415f7c02526d.pdf?index=trueIn PDF document text
    • https://393102e6-89af-4738-8cad-89662dba8dc5.filesusr.com/ugd/33a16d_32b1c6ff72e54d278238dfc24ea9dbda.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_off00014c24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14C24 5420 bytes
SHA-256: 8f92446338782048e0b15c2fc855ecbf2d27f5a10b7dd62c87e3d67b77f1b875
font_01_sfnt_off00015e89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15E89 11536 bytes
SHA-256: d903751e2c939c290d23b4690a342146da7d354201ef028ff88530e4ab0e6902

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