Malicious PDF — malware analysis report

Static analysis result for SHA-256 ceb5cb45c3accf95…

MALICIOUS

PDF

81.8 KB Created: 2021-05-16 11:40:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 5ef0ca646015037dc6bf65ea04d03a96 SHA-1: 7010d718a7bb30932cd2f99d77e39eff4400fb91 SHA-256: ceb5cb45c3accf954b294df54be9a1577655f6707c684577220e33dc47bca368
134 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 and presents a deceptive download button. 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 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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/strik?utm_term=baldur%2527s+gate+2+enhanced+edition+download PDF link annotation
    • http://fonivoguko.medianewsonline.com/72906337234.pdfIn PDF document text
    • http://fixebojamofi.iblogger.org/daru_peeni_band_kar_de_mp3_song_download_dj.pdfIn PDF document text
    • http://nawajojipiv.iblogger.org/kogonogulamukikev.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415530/normal_6047e68cab891.pdfIn PDF document text
    • http://wudenufodoroziv.scienceontheweb.net/list_of_important_days_in.pdfIn PDF document text
    • http://kexedeziferu.sportsontheweb.net/36162318379.pdfIn PDF document text
    • http://pabazumakubonok.66ghz.com/geometric_sequence_and_series_practice_worksheet.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411479/normal_5fd1e3cc15946.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447086/normal_603ed99682b37.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479906/normal_603c756ceb2cf.pdfIn PDF document text
    • http://tiluvopira.medianewsonline.com/28551043933.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481999/normal_6050184e04a30.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://molagegivijoxu.onlinewebshop.net/2005_ford_mustang_gt_for_sale_craigslist.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bf91307a-36e4-4b23-977a-010fc3cdcc49/the_laramie_project_by_moises_kaufman.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/61e2a32b-1947-43b9-a21a-669d182077cc/kenmore_smartwash_dishwasher_reset.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c59ff8c8-7f94-4f4e-a41c-fe62adfac5a4/how_do_you_factory_reset_a_amazon_fire_tablet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8b5c8079-0da2-4bb9-987f-67099816ce3a/xusija.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/08bc1315-65a6-4f16-aa56-b0cee75e34be/nosajutage.pdfIn PDF document text
    • http://karokifewugasuz.onlinewebshop.net/zojan.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00011fda.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x11FDA 17492 bytes
SHA-256: 4f8a61a6d276b8a1ec671ff2908f7e9166af559548b04afcce5b75560c77250f
font_00_sfnt_off0000e833.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE833 5508 bytes
SHA-256: bcf3ab6469c33f0564fdcc6c85ec804350518dd91b978c54c137b65d58a94162
font_01_sfnt_off0000fb0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB0A 10720 bytes
SHA-256: ce3566346182c4dc50b92039c356e6f70efacf40d659d8343c614300caa2139b

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