Malicious PDF — malware analysis report

Static analysis result for SHA-256 39d2547759cdd6f0…

MALICIOUS

PDF

84.0 KB Created: 2021-10-10 17:05:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: b430d73b08e62984c357ec8e1522bb87 SHA-1: fc59e318774061fe889076c10b4ba6ea746ce705 SHA-256: 39d2547759cdd6f09220a6b684a00908dbe9b60d15bb2c7e07c462eac598726c
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM indicates a large number of links to potentially disposable domains, suggesting a link farm used for SEO manipulation or to host phishing pages. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to malicious sites for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://trevorhannant.com/nedigokesegi.pdf In PDF document text
    • http://verypool.cn/images/upload/File/panukizawarunun.pdfIn PDF document text
    • http://lactopad.com/uploads/files/xerug.pdfIn PDF document text
    • http://asqcert.net/files/files/27436646256.pdfIn PDF document text
    • http://scvumaichiramen.com/uploads/files/rugebadexirafopidun.pdfIn PDF document text
    • https://ferado.vn/userfiles/file/lotitawamuwadej.pdfIn PDF document text
    • https://eownauto.com/uploadpic/files/nufiporirejujoxag.pdfIn PDF document text
    • https://ismart99.net/upload/files/memivularubuti.pdfIn PDF document text
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/vp51sqssibdn0ouk9tr5ofbihl/wibejopawidaratetibazixu.pdfIn PDF document text
    • http://centralgiving.com/media/userfiles/file/79069239157.pdfIn PDF document text
    • http://www.phsdcenter.com/temp/js/ckfinder/userfiles/files/vujavopefeduma.pdfIn PDF document text
    • http://crediramasrl.it/public/file/4992796635.pdfIn PDF document text
    • https://ozanetiket.com/TasarimAcarnet/serhali/upload/files/wujewadelekigevamelul.pdfIn PDF document text
    • http://onfireinteriors.com/userfiles/sekoworibonominag.pdfIn PDF document text
    • http://klm-co.ru/foto/ck/files/lexijerusidodikolideler.pdfIn PDF document text
    • https://webhosting4.net/media/file/87811715212.pdfIn PDF document text
    • https://officialbacknumber.org/editor_up/texugojoloraso.pdfIn PDF document text
    • http://vincityhomes.vn/wp-content/plugins/super-forms/uploads/php/files/07qc22s773ab7uugd4bauhruhs/mopanefimiromusuzafe.pdfIn PDF document text
    • https://minhkygroup.com/luutru/files/wigajenigojoxuputilolup.pdfIn PDF document text
    • http://hacoauto.vn/upload/files/jifitejimetibiwenagoso.pdfIn PDF document text
    • http://plenaseguroseprevidencia.com/fotosempresa/files/wulinusojuziparag.pdfIn PDF document text
    • http://jewelry-shopping-city.com/uploads/files/202109201122133326.pdfIn PDF document text
    • http://friulanapanini.com/images/file/95616853871.pdfIn PDF document text
    • https://clinicaabrahaoosta.com.br/ckfinder/userfiles/files/76191659885.pdfIn PDF document text
    • http://ihanzao.com/userfiles/file/20211008175149_719645254.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=frequency+separation+tutorial+pdfPDF 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_off0000e03c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE03C 10948 bytes
SHA-256: cedb66de2d67774e490c10524f76a101cfa3e08fb6d6e28532e0ef793a7786c4
font_01_sfnt_off0000f989.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF989 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001119b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1119B 18420 bytes
SHA-256: c992ba3f1462822467aee73318c08c9a01a5ca2a73c499da599aeb4ed66c8a96