Malicious PDF — malware analysis report

Static analysis result for SHA-256 f74dc0ec7e4d8bc3…

MALICIOUS

PDF

87.6 KB Created: 2021-09-17 13:59:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 5e7be4c283aca7b775e24fc444259390 SHA-1: e2191fdb2ef8e3d12117fc8231bcf81c658b21f8 SHA-256: f74dc0ec7e4d8bc3334fcb31383aa73cfaa10f18d60cbb88231ce4d20fde4f9a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable or potentially malicious domains, suggesting a link farm or phishing attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly 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 0.9974

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://mariautonoleggiomarsala.it/userfiles/files/kifoxusajujuxawugab.pdf In PDF document text
    • http://kcntanduc.vn/img_duhoc/files/62194715760.pdfIn PDF document text
    • https://rippa.pt/files/file/limoferuzoronarek.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/48849537358.pdfIn PDF document text
    • http://le-bouquet.be/userfiles/files/jaxadagimen.pdfIn PDF document text
    • https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/ef3e69f9faae456b779b181a9110c6ac/41509078865.pdfIn PDF document text
    • http://trieuduong.com/images/Download/28587405315.pdfIn PDF document text
    • http://degeninhotel.ru/admin/ckfinder/userfiles/files/dikusobo.pdfIn PDF document text
    • http://choragwica.pl/userfiles/file/jumoxefuwuk.pdfIn PDF document text
    • http://bocghedanang.com/media/ftp/file/84535905102.pdfIn PDF document text
    • http://hlqh.net/userfiles/file/20210917004759_1932881536.pdfIn PDF document text
    • https://extremedriveline.com/ckfinder/userfiles/files/ginuwobob.pdfIn PDF document text
    • https://faresaldabbous.com/uploads/file/19502154283.pdfIn PDF document text
    • https://knoxvilleremembers.com/media/xukiranigo.pdfIn PDF document text
    • http://nemdanangpho.com/uploads/2021-09-16/images/files/47500131807.pdfIn PDF document text
    • https://galaxytraining.examinationonline.com/files/sebamekoza.pdfIn PDF document text
    • http://spec-so.ru/sites/default/files/file/deverugitukojimirojezara.pdfIn PDF document text
    • https://artinterior.bg/userfiles/file/zigaxufogofupotagem.pdfIn PDF document text
    • http://sieuthibds.net/images/files/81434878802.pdfIn PDF document text
    • https://photopoligrafic.ru/ckfinder/userfiles/files/26809721984.pdfIn PDF document text
    • https://xn--22ck6bdp5cach0mc23a.com/ckfinder/userfiles/files/90060498288.pdfIn PDF document text
    • https://thefencedocumentary.com/adminfiles/file/57631751160.pdfIn PDF document text
    • https://mcq.bmtinhoc.vn/InteriorWeb/images/images_news/files/nutaximezovafozetirili.pdfIn PDF document text
    • http://katyababash.com/images/uploads/file/91753023257.pdfIn PDF document text
    • http://thanhnienxp.com/vietkiendo/upload/file/gitisijajid.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=free+liker+instagramPDF link annotation
    • 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_off0000f311.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF311 10400 bytes
SHA-256: 5173649ea81a033ab24a1bf00f1cadf360e70643e9314c4a5fc9c3e26f724d13
font_01_sfnt_off00010a8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A8F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000122a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122A1 17904 bytes
SHA-256: 8367ad608861adf15376014d70419a14b566c2ef5fabf4dcdc7e1de58ae6c701