Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1ac8d469a33122a…

MALICIOUS

PDF

75.6 KB Created: 2021-09-26 04:48:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: ecbbf5963a95e55e4dbdf71ada9b6aec SHA-1: 414fa99b603b0de57f637c433b4101bcf7781517 SHA-256: f1ac8d469a33122a10c695c8c86be35aa170b0a84d37591bc7cc2187884d4775
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript and multiple external URIs, indicating malicious intent. The ML classifier and ClamAV detection strongly suggest this is a phishing or malware distribution document. The embedded JavaScript likely facilitates the redirection to malicious sites, as evidenced by the numerous external URLs found, many of which are hosted on disposable domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://irlanc.ru/uplcv?utm_term=swords+and+sandals+5 PDF link annotation
    • http://ayurveda-shiatsu-nice.com/upload/files/xiruz.pdfIn PDF document text
    • https://aslplastic.com/ckfinder/userfiles/files/xulakixaxizobuwefesopif.pdfIn PDF document text
    • http://hoshitorionline.com/uploads/files/35055614718.pdfIn PDF document text
    • http://dekoblickfang.de/userfiles/file/vuxanedejixediw.pdfIn PDF document text
    • http://luxlustry.ru/img/upload/dotuzekelidamafoxokubuk.pdfIn PDF document text
    • http://climtech.com/files/files/89470177216.pdfIn PDF document text
    • http://ciarajewellery.com/editor_upload/file/62353846502.pdfIn PDF document text
    • http://titibbs.xyz/js/ckfinder/userfiles/files/kolifotoruloka.pdfIn PDF document text
    • https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/bb77c81b6e2c0ed452c18cc687bc24fc/mozolomedemuv.pdfIn PDF document text
    • https://prestinireedcorp.com/userfiles/files/75964436199.pdfIn PDF document text
    • https://thic.muki001.com/plugin/ce1/ckfinder/userfiles/files/visuxatidowik.pdfIn PDF document text
    • https://kingwaterpure.com/ckfinder/userfiles/files/fawudasopadasololenefebe.pdfIn PDF document text
    • http://dc-a0dcf319a153.breakthroughsport.com/userfiles/files/tunefibosenof.pdfIn PDF document text
    • http://logopeda-empatia.pl/content/file/pozuruwekopu.pdfIn PDF document text
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141e5559db45---sazuda.pdfIn PDF document text
    • http://trinitysportsandleisure.ie/userfiles/file/lisoko.pdfIn PDF document text
    • http://jysfh.com/upload_fck/file/2021-9-8/20210908105816663053.pdfIn PDF document text
    • http://eurolocal.info/sites/default/files/images/file/totopiduronemige.pdfIn PDF document text
    • https://florerialafloresta.com/ckfinder/userfiles/files/xalinifarigoruguvosegir.pdfIn PDF document text
    • http://mmsmarin.com/imgimage/file/40289492930.pdfIn PDF document text
    • http://mediedil.eu/userfiles/files/80293106165.pdfIn PDF document text
    • http://alrabbancapital.com/file/files/7135745109.pdfIn PDF document text
    • http://decaldankinh.net/upload/files/vitifajarexidoka.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_off0000bf43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF43 10216 bytes
SHA-256: 0f51ff1c4d600da03dd6740a18d414891836ded62815b9eb7a7291e1b99a935a
font_01_sfnt_off0000d657.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD657 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ee69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE69 19640 bytes
SHA-256: e1868c0f3d60ae60de57bf224126709a5b3b6265ecca675cf2d042bbda63983a

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