Malicious PDF — malware analysis report

Static analysis result for SHA-256 b89f4efdbf555214…

MALICIOUS

PDF

70.8 KB Created: 2021-06-01 00:49:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: ce3c9db1e293e72b2087d26ecf2de5d8 SHA-1: ecedb5827b6e7b27c8324940756c524f35a7343a SHA-256: b89f4efdbf5552149a7d86274aa90ab382b9380dfeb9a23a28c3ce1648b794f2
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document contains a large number of external links, identified as a link farm. The primary malicious URL observed is https://kuzutuzo.ru/123?utm_term=george+adamski+libros+pdf. The presence of a link farm suggests an attempt to direct users to potentially malicious websites, aligning with phishing or malware distribution tactics. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 6

  • 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 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/123?utm_term=george+adamski+libros+pdf PDF link annotation
    • https://rilewinip.weebly.com/uploads/1/3/5/9/135964764/6397880.pdfIn PDF document text
    • https://wugumura.weebly.com/uploads/1/3/4/6/134601103/kejipolifa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4468571/normal_5ff02d91edb2e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415527/normal_6009f877d9427.pdfIn PDF document text
    • https://tujazemedup.weebly.com/uploads/1/3/4/4/134473975/1250474.pdfIn PDF document text
    • https://venatijaw.weebly.com/uploads/1/3/4/6/134680547/fapolejenevofob.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367004/normal_604d171970924.pdfIn PDF document text
    • https://lemusudavigi.weebly.com/uploads/1/3/5/3/135395292/fesidajo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426550/normal_603fcb5ae1c54.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gulisapil.pbworks.com/f/how_to_write_daily_progress_report.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d84c8ff8-42f5-43cf-b5c9-78fb24c2c58f/formato_de_minuta_de_trabajo_en_excel.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7c975365-16b5-494f-a9d8-b227fcd873c7/macmillan_mcgraw-hill_science_grade_4_online_book.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e8b32195-6489-404f-8828-4e67a450d750/lododeverojepe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/de744ed2-33c6-4ebe-8656-bcc0bc51045b/sizatajokezuwusijeger.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1154063b-f022-4bb4-a7df-df828d65cdf2/go_tell_it_on_the_mountain_movie_1984.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0bd61846-77f4-4081-89ec-5c968dd8e9bf/zotimotopimebu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bfca46c2-26d8-4218-87b8-b20d01831ba2/why_is_my_powera_controller_not_working.pdfIn PDF document text
    • http://zezimin.pbworks.com/w/file/fetch/144412257/the_measure_of_man_and_woman_human_factors_in_design.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5e27b866-244b-42f8-8253-aad4bb498a13/65513014891.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dff2f338-47b1-472c-b572-799f709fcb9c/mosemibutodevugotogedote.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4dd59618-525f-46b8-99a1-eaa9352c2944/79480757858.pdfIn PDF document text
    • http://viluxese.pbworks.com/w/file/fetch/144428688/razudad.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9f714b23-6fbf-4c21-aef7-a10a98357423/craftsman_platinum_7.25_163cc_oil_type.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_off0000d6a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6A7 5596 bytes
SHA-256: 1c25a7ca2bdbc9aaec7feae3680f4c8614f487cf5ea5d4984805272bd46daa76
font_01_sfnt_off0000e99b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE99B 10956 bytes
SHA-256: fa25927b8580ed1273c78ecde5a0ba1f1a3e9fd36f2eb107df6b641103f0eac1

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