Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a219f5d8773b972…

MALICIOUS

PDF

70.7 KB Created: 2021-09-18 22:19:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 1a24ed35f56b4a807de2ca267b91c57b SHA-1: 1b0ffd5bfd0f70ed70432e7aedc2bbabcc2ec448 SHA-256: 5a219f5d8773b9720bbc62f8b0a5c192ada44aeaa409307ed9de17bf960abd30
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous links to external PDFs hosted on disposable domains, suggesting a link farm used to obscure the ultimate destination or to distribute further malicious content. The presence of multiple distinct hosts and links points towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://blfimmobiliare.com/userfiles/files/vakilil.pdf In PDF document text
    • https://robertbah.si/files/file/kuzumupefejazujetukebo.pdfIn PDF document text
    • https://fceresources.com/ckfinder/userfiles/files/kifukuguxugav.pdfIn PDF document text
    • https://istanajpdua.com/contents/files/98461733265.pdfIn PDF document text
    • http://provia-events.de/pics/fotos/1/file/57634746377.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131a80ee54b7---25317853731.pdfIn PDF document text
    • http://vekosgroup.ru/userfiles/file/rupeturodowevudop.pdfIn PDF document text
    • http://obkladacstvikolar.com/content/petivago.pdfIn PDF document text
    • http://ieeepes-thailand.org/app/webroot/files/files/79124159833.pdfIn PDF document text
    • http://expnavi.com/sites/all/sites/default/files/file/9853888527.pdfIn PDF document text
    • http://www.supair-lux.hu/ckfinder/userfiles/files/bimogabunesiresit.pdfIn PDF document text
    • http://alsace.annuaire-regional.com/ckfinder/userfiles/files/67212524967.pdfIn PDF document text
    • https://vinadesigndanang.vn/uploads/image/files/jezidadupefemifuwi.pdfIn PDF document text
    • http://herningbadintra.dk/app/webroot/upload/files/5079982581.pdfIn PDF document text
    • http://montpellier-businessplan.com/mbp/upload/images/images/upload/ckfinder/maniguvifotetapijukud.pdfIn PDF document text
    • http://khonggianmang.com/upload/files/xevuvofomupenopajamuf.pdfIn PDF document text
    • http://www.masozilina.sk/ckfinder/userfiles/files/23580437507.pdfIn PDF document text
    • http://allier.proximeo.com/ckfinder/userfiles/files/ganavinimisagodupenopi.pdfIn PDF document text
    • http://orvositudasbazis.eu/images/upload/file/6773341523.pdfIn PDF document text
    • https://quatcongnghieput.com/uploads/files/buxebovakakinalujerojuvir.pdfIn PDF document text
    • http://dgjinhak.kr/DATA/upload/files/202109120822556603.pdfIn PDF document text
    • https://catequesisnavarra.org/guiarte_userfiles/files/31749347505.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=best+way+to+watch+live+footballPDF link annotation
    • https://rt9.rspo.org/ckfinder/userfiles/files/83899424659.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_off0000b5c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5C0 10688 bytes
SHA-256: 059c8a04519e82b8b7662e9f409a7353c0b43794980f9fe7912c852a9de06f0f
font_01_sfnt_off0000ce8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE8C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e69e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE69E 15268 bytes
SHA-256: 39e7a515914e4a4206ceda7dacd5a26db60a4ba1fbc2fcdc19e37684e24738d8