Malicious PDF — malware analysis report

Static analysis result for SHA-256 62c5c3935e0aa7c0…

MALICIOUS

PDF

81.1 KB Created: 2021-09-10 22:18:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-01
MD5: d7dc45a95ad34c2badc58cc649f5e969 SHA-1: ac59cf8d170521335486d706ca1ef817490b1b1d SHA-256: 62c5c3935e0aa7c06f0264c5e5c0a72b87f3259b86d1b9926c70d09dbe3a62e4
126 Risk Score

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 0.9975

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://ketchas.ru/uplcv?utm_term=jelly+bean+app+download PDF link annotation
    • https://oncallanatomist.org/ckfinder/userfiles/files/61182663140.pdfIn PDF document text
    • https://grandegroup.net/files/voledefaguzewilaxu.pdfIn PDF document text
    • http://hotechike.com/files/files/velevosapujume.pdfIn PDF document text
    • http://medicamarsala.it/userfiles/files/gigajuwufuzodixexak.pdfIn PDF document text
    • http://ecohouse-lab.com/userfiles/file/didoxupo.pdfIn PDF document text
    • http://abwva.com/uploads/files/tekaxejewigonemol.pdfIn PDF document text
    • http://airconbank.com/upload/fckeditor/file/3832548404.pdfIn PDF document text
    • https://fentesmakina.com/paket/upload/files/69249201224.pdfIn PDF document text
    • https://gullyracing.it/admin/ckfinder/userfiles/files/18126798770.pdfIn PDF document text
    • https://red-adlay.com/upload/files/zuxof.pdfIn PDF document text
    • https://weekendtripskolkata.com/userfiles/file/gebunoxu.pdfIn PDF document text
    • https://drakbera.com/ckeditor/ckfinder/userfiles/files/nakuzale.pdfIn PDF document text
    • https://mannoorpally.com/uploads/file/45369139048.pdfIn PDF document text
    • http://hoteldanang.com/uploads/images/files/fagejutofi.pdfIn PDF document text
    • http://gotween.com/userfiles/file///bifexosimovasepot.pdfIn PDF document text
    • http://zhihepvb.com/upload/ckimg/files/202109101300036703.pdfIn PDF document text
    • http://thucancakoihikari.com/luutru/files/finufiwuwivebapabuzitul.pdfIn PDF document text
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/3856cdcc75280195b433556aea74c6e0/lifesabugokuf.pdfIn PDF document text
    • http://plymouth-logs.co.uk/ckfinder/userfiles/files/50509876443.pdfIn PDF document text
    • http://dunajecbiala.pl/upload/File/66864297908.pdfIn PDF document text
    • http://cherriestattoo.com/ckfinder/userfiles/files/99678933920.pdfIn PDF document text
    • https://bongkartuantakur.com/contents/files/94439955615.pdfIn PDF document text
    • https://xn--lenachatka-57b.pl/uploaded/file/levasabonelalagusux.pdfIn PDF document text
    • http://jarosi.hu/files/file/lunusokixajodubaweritax.pdfIn PDF document text
    • https://stotex.rs/files/67674593277.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000db66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB66 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f378.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF378 17064 bytes
SHA-256: 917fcf489e89857114637d6b0ba7ffeeb44d41bd44ef4e76cf3316d272c74dab
font_02_sfnt_off00011fca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FCA 10256 bytes
SHA-256: 82df2521270d04396d9655aceaaaf7fa3a4485bb4acac82077175b8ac4fc46bf

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