Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a7f38cdf35da4a6…

MALICIOUS

PDF

71.6 KB Created: 2021-09-10 18:24:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 7b547510a0321f8ec46bdb1e1aee00a1 SHA-1: 2cffa48c2e0837df0302a14e0dca26b7eee987be SHA-256: 5a7f38cdf35da4a613bb280e701ab8d3bd3ac86ec0ae3b9ced21177c40705a9d
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs and is flagged by heuristics as a link farm on disposable hosting, indicating a phishing or redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to exploit vulnerabilities or trick users into downloading further payloads.

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 http://duet-czluchow.pl/userfiles/file/45482728493.pdf In PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1613af6cf94b74---34247949650.pdfIn PDF document text
    • http://tandartsindex.nl/images/uploads/54586417225.pdfIn PDF document text
    • https://edusfera.pl/upload/file/doxazuwuk.pdfIn PDF document text
    • https://buildingexpertsdirectory.com/ckfinder/userfiles/files/janeviket.pdfIn PDF document text
    • https://khachsan295doson.vn/namthuan/images/news/files/zoraxazovusagibager.pdfIn PDF document text
    • http://vector-food.com/userfiles/file/75947125041.pdfIn PDF document text
    • https://birotex.rs/images/files/62172194764.pdfIn PDF document text
    • http://telegid.tv/userfiles/file/baxebanevinikumitefe.pdfIn PDF document text
    • http://satyamtracparts.com/userfiles/file/70589542369.pdfIn PDF document text
    • http://copy-office.it/userfiles/file/94303670167.pdfIn PDF document text
    • http://arrhythmiaclinic.com/userfiles/file/20210905181708.pdfIn PDF document text
    • http://bordahusfeldolgozo.hu/editor_up/norozomeganusabujeselekop.pdfIn PDF document text
    • http://phutungotodungha.com/img/files/zibavesefewugag.pdfIn PDF document text
    • https://cyc-catering.pe/disac/userfiles/file/86353222605.pdfIn PDF document text
    • http://h-st.nl/bestanden/files/gegezopora.pdfIn PDF document text
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/59c3977587b8b498a4af9702311a929e/nanifaja.pdfIn PDF document text
    • http://jhdljz.com/userfiles/file/1630684508.pdfIn PDF document text
    • http://cloverdiamond.com/file/fopulejodeb.pdfIn PDF document text
    • https://osakaav.com/userfiles/files/11223218594.pdfIn PDF document text
    • https://www.cifphosteleriayturismo.es/ckfinder/userfiles/files/sulakemulavix.pdfIn PDF document text
    • http://stlukesfp.org/ckfinder/userfiles/files/genarusuxusigunobinatij.pdfIn PDF document text
    • http://usaoxin.com/userfiles/2021-9/file/73150944231.pdfIn PDF document text
    • http://racecross.com/upload/edito_fckeditor/file/munisokobisasusa.pdfIn PDF document text
    • http://eqletstalk.com/uploads/files/202109070134231784.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=fall+guys+beta+androidPDF 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_off0000b8a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB8A3 10752 bytes
SHA-256: 7e313873130e364a7efafa51ab55610432e5f3098da4f7ef94fde95b68194b79
font_01_sfnt_off0000d147.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD147 15672 bytes
SHA-256: f3e4255e1c68ca284a9014a8ecbc6eaab22d1316e1cf16a40a6c0104d35c1fe3
font_02_sfnt_off0000f911.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF911 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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