Malicious PDF — malware analysis report

Static analysis result for SHA-256 098273fb6257f110…

MALICIOUS

PDF

77.1 KB Created: 2021-03-21 09:40:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 4f73efad354631eda08bb5110df85e27 SHA-1: 5e837772d7f8ba375ee560341d2218d372b39df9 SHA-256: 098273fb6257f110778d359882fc33b61b67ea7a89a059ce6f1545b4f8e80673
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 0.9989

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://xajibur.ru/wix?keyword=kkmoon+nvr+manual PDF link annotation
    • http://werenntaq.online/american_history_textbook_9th_grade4pnlx.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408340/normal_5fe3dee440156.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426967/normal_6013a3814d82c.pdfIn PDF document text
    • http://vienvozvrat.site/intermatic_wh40_timer_partsteqlv.pdfIn PDF document text
    • http://baffer-shop.space/projective_geometry_textbooksx9412.pdfIn PDF document text
    • http://lupazul.mywebcommunity.org/ccna_notes_download.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4497078/normal_5fe47f632fe5a.pdfIn PDF document text
    • http://ppl-nutrshopfit.website/89951917911jd2d.pdfIn PDF document text
    • http://e-devletodeme.net/jazuronibenifej9aiof.pdfIn PDF document text
    • http://semengergel.ru/documentary_storyboardsd4sf.pdfIn PDF document text
    • http://my-favshopg.online/dialysis_technician_salary_nyo2xo5.pdfIn PDF document text
    • http://sezejawi.mypressonline.com/27715639314.pdfIn PDF document text
    • http://vas-rem.ru/40921345107guqjm.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459319/normal_602da45d4c0a0.pdfIn PDF document text
    • http://stat-index-co.com/quran_in_roman_english_free_downloads1u32.pdfIn PDF document text
    • http://xufopizaxeto.medianewsonline.com/green_architecture_definition.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://e590c0d9-b694-44fb-9862-47327b30d8b0.filesusr.com/ugd/89363e_66e732aa05c047fa81d704f164304cd8.pdf?index=trueIn PDF document text
    • https://12f7643e-9106-4823-89c2-0bdaecd1bc22.filesusr.com/ugd/1f6d71_4502b057f2224f4cb71d1d24579947fb.pdf?index=trueIn PDF document text
    • https://70fbc5f3-53e4-4072-9ff7-a5862d19847b.filesusr.com/ugd/bb3bf9_435ebf07eea3456c818619bf64f30eb4.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/gajabedafot/sexenidated.pdfIn PDF document text
    • https://s3.amazonaws.com/xufaxoferugod/95819828787.pdfIn PDF document text
    • https://6f81cef9-66a2-447d-9e1d-4c0427ef15c5.filesusr.com/ugd/4d935e_3171798edd8b4219ba8ca3f19477339c.pdf?index=trueIn PDF document text
    • https://a40b6db0-1679-4e03-879f-ac5827b9aa7d.filesusr.com/ugd/dba42a_2478d05e4b124d3991a2dc0b2e0d560d.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/rudelazifizuvo/adobe_audition_3._0_trial.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_off0000e50a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE50A 2960 bytes
SHA-256: 3a99bfcc8a6322cb1f5d9dd0c76c95525b0630114fc12c53a342d41e6b6e0e01
font_01_sfnt_off0000ef7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF7A 4748 bytes
SHA-256: 2a907bbabd7ae926ab2b0412cd7f31e1de53c4c406fc58873390f5f5a69291c7
font_02_sfnt_off0000ff8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF8B 11120 bytes
SHA-256: 6c8cbcda2c3f57d2765ac34c58e22f308d817c8a576c92ab6530bcabb13d871c

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