Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe5ab730a037a9d7…

MALICIOUS

PDF

85.3 KB Created: 2021-09-10 07:06:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 9d0885d9b978f67a4924a8ca6466783c SHA-1: c14c5446f94c5cbacf8002ede4f7c03b4d175a9a SHA-256: fe5ab730a037a9d7fcc868ac839f331201fd78f2ea588df5d2ca881b8543aefe
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URLs, many hosted on disposable domains, suggesting a link farm or phishing lure. The PDF structure and embedded URIs point towards an attempt to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://allytemp.ru/uplcv?utm_term=define+the+word+curriculum PDF link annotation
    • http://filippodelvita.com/demo/userfiles/file/mejufiguvefekuxan.pdfIn PDF document text
    • http://kmsenior.org/file/files/45994765231.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/161353c9f62178---nemudejare.pdfIn PDF document text
    • http://romanasulcikova.cz/userfiles/36066267893.pdfIn PDF document text
    • http://sarigol.kr/userData/ebizro_board/file/27481369364.pdfIn PDF document text
    • http://computergramm.com/userfiles/file/denusatilanepob.pdfIn PDF document text
    • https://fengshan-zhennangong.org/upload/ckfinder/files/86542373722.pdfIn PDF document text
    • https://nangluongvada.com/uploads/files/rodigegokig.pdfIn PDF document text
    • http://cattaneoarchitetti.it/userfiles/files/43612714338.pdfIn PDF document text
    • http://offerparts.com/upload/files/zaluzekoti.pdfIn PDF document text
    • http://athaj2.specialty-match.com/upload/files/rilekularojedajikewetavab.pdfIn PDF document text
    • https://stgeorgedentalcare.in/ckfinder/userfiles/files/fonapigodutasok.pdfIn PDF document text
    • http://cansuyu.org/resimler/files/jinomifamuraxetifadaj.pdfIn PDF document text
    • http://les-dvorik.ru/userfiles/file/towopu.pdfIn PDF document text
    • http://erpsamik.com/ckfinder/userfiles/files/87099675207.pdfIn PDF document text
    • http://www.sushmitamukherjee.com/fckimages/file/3102442470.pdfIn PDF document text
    • http://sasalidayanisma.org/uploads/file/436040624.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/xoxevogono.pdfIn PDF document text
    • https://andymullinscommercial.com/home/andy/public_html/ckfinder/userfiles/files/67778112171.pdfIn PDF document text
    • http://ramenzoni.eu/userfiles/files/75650519236.pdfIn PDF document text
    • https://anna-bel.com/app/webroot/files/userfiles/files/82340100997.pdfIn PDF document text
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/df37b67ec4566eeafb53df909ea87153/7779558817.pdfIn PDF document text
    • http://kayapalinakliyat.com/file/kojileri.pdfIn PDF document text
    • http://plechotice.sk/tmp/file/3062747006.pdfIn PDF document text
    • https://careerexpo.alljobsinliberia.com/ckfinder/userfiles/files/48700297213.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_off0000eb5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB5C 17220 bytes
SHA-256: 80042957cc29ea9037597c66263ae11c927b17b4b4ee05931881b929b2f3a3d6
font_01_sfnt_off000117a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117A3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012fba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FBA 10596 bytes
SHA-256: a65ddc41b7d0596f29738489d0cc1edd703cc79f6202cb81cca03550fd49a91d