Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec8c70811335bbb3…

MALICIOUS

PDF

78.6 KB Created: 2021-09-09 18:05:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 7bff3cff59bfe79cbcbaf1ae141d141c SHA-1: a13709edc2df8a5529fd2361cba9e83e7d601a34 SHA-256: ec8c70811335bbb38263d75293ee2fc542ba4ca7f57306faed88c2d2a2243ade
126 Risk Score

Malware Insights

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

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs pointing to a link farm, suggesting a phishing or SEO manipulation scheme. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of exploitation and potential redirection to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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://noithatnhapkhaugiasi.com/luutru/files/13431130989.pdf In PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/161383a5f1e252---38315839805.pdfIn PDF document text
    • https://yucekalipmakina.com/tsrm1/img/userfiles/file/zozozagefagojoralulojux.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f4326513c8---wazobatarame.pdfIn PDF document text
    • http://2018.letnifestiwal.pl/ckfinder/userfiles/files/58556213382.pdfIn PDF document text
    • http://antichigelsi.it/userfiles/files/bojogi.pdfIn PDF document text
    • http://alfavs.eu/userfiles/file/86025791925.pdfIn PDF document text
    • http://alexandersorokolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/30322875082.pdfIn PDF document text
    • http://abpjse.news-read.com/upload/files/93340576137.pdfIn PDF document text
    • https://shoppe.everybodyisnotdoingit.org/gift/userfiles/files/birowutut.pdfIn PDF document text
    • https://linardi.ru/files/file/puxokux.pdfIn PDF document text
    • http://www.ujepites.hu/userfiles/files/tofunazigatiponewip.pdfIn PDF document text
    • https://niboparis.com/upload/fckeditor/file/1630956895_1.pdfIn PDF document text
    • http://zeroseistudio.eu/userfiles/files/32541056756.pdfIn PDF document text
    • https://www.bevillelecomte.ovh/ckfinder/userfiles/files/1539824573.pdfIn PDF document text
    • http://plaschke-partner.com/uploaded/file/94388945396.pdfIn PDF document text
    • https://sieuthimaycafe.vn/uploads/file/nowadefiniginujupatufuko.pdfIn PDF document text
    • https://serviceelectric.ca/userfiles/file/doxolaxovarozigokowikife.pdfIn PDF document text
    • http://leebyenghun.com/new/upload/board/files/neteje.pdfIn PDF document text
    • https://nichecnk.leaddeehub.com/userfiles/files/joxuvibakivudejesawobur.pdfIn PDF document text
    • https://securitydm.rs/slicice/file/51219288751.pdfIn PDF document text
    • http://inercial.es/uploads/files/67722256866.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/65341692893.pdfIn PDF document text
    • http://lctrading-gmbh.com/ckfinder/userfiles/files/72616550386.pdfIn PDF document text
    • http://dogalakustik.com/depo/sayfaresim/file/66526201767.pdfIn PDF document text
    • http://sunriverps.com/data/editor/file/19059396961.pdfIn PDF document text
    • http://dpsnowodworze.pl/userfiles/file/fujokolewenorar.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=lucifer+season+3+putlockerPDF 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_off0000cdc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDC3 10796 bytes
SHA-256: 7af5c080780afc146cca1e4e372ea72f33fc188f80b0f0207ec7edba46ddbe39
font_01_sfnt_off0000e6d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6D4 17864 bytes
SHA-256: 9edbee06d1123f23a7f550dddb6bc84301734af24552ae999029b1e88f5a1da3
font_02_sfnt_off0001149b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1149B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1