Malicious PDF — malware analysis report

Static analysis result for SHA-256 24768ef7c21eccf4…

MALICIOUS

PDF

83.2 KB Created: 2021-09-19 00:47:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 70f33ba2387136a36f45b07e216c512e SHA-1: ee318c0afe90c3b50a22846fc694887635b3b3b1 SHA-256: 24768ef7c21eccf41398012b2da72460c4287ecf15df458b7b5c173fc31c93fd
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded URLs, many of which point to disposable hosting or link farms, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://coretry.ru/uplcv?utm_term=joey+online+stream PDF link annotation
    • https://bbu.vn/Images_upload/files/pakedomepopepukasikug.pdfIn PDF document text
    • https://t2sc.me/userfiles/62004661878.pdfIn PDF document text
    • https://militarynetwork.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613c59eace48e---73436321993.pdfIn PDF document text
    • https://reviewz.eu/app/webroot/files/userfiles/files/repareliwizuriwanimo.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c45a1c9edb---80945071967.pdfIn PDF document text
    • https://peusch.lu/userfiles/files/lolakelunepado.pdfIn PDF document text
    • http://www.addvanceo.info/userfiles/files/19735907915.pdfIn PDF document text
    • http://sobateracota.ro/mm/file/75363550476.pdfIn PDF document text
    • http://lsphc.com/userfiles/file///89648066027.pdfIn PDF document text
    • http://p-energo.ru/content/file/97501988415.pdfIn PDF document text
    • http://amicissiapiemonteisa.it/userfiles/files/98483670839.pdfIn PDF document text
    • http://anhuishangbiao.com/upload_fck/file/2021-9-2/20210902043019514131.pdfIn PDF document text
    • http://jmvlpslimited.com/ci/userfiles/files/tovarupatefuxad.pdfIn PDF document text
    • https://tahuacoop.com/cms_gpadmin2015/sgi_userfiles/userfiles/files/20892056128.pdfIn PDF document text
    • http://annassteen.com/ckfinder/userfiles/files/dudepufuletopugalirini.pdfIn PDF document text
    • http://realestatespoznan.com/uploads/45866741125.pdfIn PDF document text
    • http://yacpa.org/yacpafiles/file/96476429883.pdfIn PDF document text
    • http://vtaky.sk/media/file/gewegujezagupu.pdfIn PDF document text
    • https://satnamunicipalcorporation.com/admin/ckfinder/userfiles/files/vezekuzovogumuxux.pdfIn PDF document text
    • http://dpsnowodworze.pl/userfiles/file/69030037698.pdfIn PDF document text
    • http://aostavet.it/userfiles/files/bedisabilidiribijobutinut.pdfIn PDF document text
    • http://ewtch.com/upload/files/88773889079.pdfIn PDF document text
    • https://associazionebriciole.it/public/file/46872824439.pdfIn PDF document text
    • http://ihdbd.org/upload/files/39737169113.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_off0000e2d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2D7 17424 bytes
SHA-256: 5387be0a05d013953644834fb858836b60a29cf23811cad2a90c6f9288700d7e
font_01_sfnt_off00010f9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F9E 10376 bytes
SHA-256: ee620cd5c64b24ca189e35aaf81704739d68af502f87f5829933729bc7e66c2f
font_02_sfnt_off00012721.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12721 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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