Malicious PDF — malware analysis report

Static analysis result for SHA-256 61882ca73bcf1bf0…

MALICIOUS

PDF

73.8 KB Created: 2021-03-31 16:10:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 748a9809de3f66a2af023a0b6ddff4b3 SHA-1: 59887e09e25d0a5a44ca75e61983304ef165c8b7 SHA-256: 61882ca73bcf1bf04cbce10e6d6b5aca08c3593b04b0f51e1eaef42d563b355f
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://kuzutuzo.ru/award?keyword=a+ha+take+on+me+sheet+music+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4415321/normal_6022344bb9cd2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454990/normal_5fd9595c5b849.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484609/normal_5fd130d0b5e49.pdfIn PDF document text
    • http://ramifapufebi.scienceontheweb.net/if_you_could_see_me_now_book_free_download.pdfIn PDF document text
    • http://newuwedeza.mypressonline.com/27614854113.pdfIn PDF document text
    • http://xamoxipuwizutux.scienceontheweb.net/andres_segovia_partituras.pdfIn PDF document text
    • http://wimuzawoxi.getenjoyment.net/approaches_to_classroom_management.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://5f90d536-2a72-4461-adff-280afd3056cb.filesusr.com/ugd/27c394_405f78482eaf4bcfb517192fb14c945c.pdf?index=trueIn PDF document text
    • http://kubowulurarekij.myartsonline.com/9927419653.pdfIn PDF document text
    • https://s3.amazonaws.com/davubewu/pepulijokomalisemal.pdfIn PDF document text
    • https://f238abdf-92e3-4651-90df-65b6e8a648d9.filesusr.com/ugd/99965f_b4b12694fa3e430899ffe1072db20d52.pdf?index=trueIn PDF document text
    • https://80c93ba6-74df-4afb-9852-3a83eaba20e3.filesusr.com/ugd/4cf28d_3ed50de579984311b69ce8f4466f999a.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/bovenotojitowe/formal_complaint_letter_to_school_sample.pdfIn PDF document text
    • https://e57d8632-f742-4524-ada6-9cdf759d9f13.filesusr.com/ugd/b0cb2d_42325daaccae439298d16e13f8f59475.pdf?index=trueIn PDF document text
    • https://a62e46b8-d933-4087-892c-e5439cec6991.filesusr.com/ugd/e9cba9_2685eea914534710b7aa9370a1e81ade.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/vonuxagupeduze/komovegazibu.pdfIn PDF document text
    • https://8df9d1b7-8f6e-49e1-bdac-c9da4d4291fd.filesusr.com/ugd/12c198_73dd97da37a54e379453f44f3d2c094d.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/vixuwogetiv/27559157583.pdfIn PDF document text
    • https://da5bec28-7969-4117-8ffb-5069fce5e80c.filesusr.com/ugd/31593d_0e0aa9e4318c4ac4a58cdda303f08127.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_off0000e2e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2E4 5320 bytes
SHA-256: 2915e90064bf6a12692dd4f97d3b8c26a90e30a43034af043355cba48a71ef83
font_01_sfnt_off0000f4e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4E0 10928 bytes
SHA-256: 89d45f7ea0aaf6cb826d4df3211251e09589266839aaf88e04207effaccd08a9

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