Malicious PDF — malware analysis report

Static analysis result for SHA-256 2fdd88fa34a93996…

MALICIOUS

PDF

77.6 KB Created: 2021-09-23 12:20:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 18f898081dcb8ce8c53082db0a2e3f3f SHA-1: 4543cd5122415dd32ca7a495a5b3dc478cee5ebf SHA-256: 2fdd88fa34a93996bd106be3963d73cdc33bce9c63ad2d8c1ac017d698087c65
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was flagged by a machine learning classifier and ClamAV as malicious. It contains numerous embedded URLs, many of which point to PDF files on potentially disposable domains, suggesting a link farm or redirection mechanism. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a high likelihood of malicious intent, possibly for phishing or distributing further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9827

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://ricettebiagi.it/uploads/assets/file/bugasasufazefo.pdf In PDF document text
    • http://kythuatviet.vn/uploads/userfiles/file/sivuzexuxemujerefabak.pdfIn PDF document text
    • http://artikos.pl/userfiles/file/pijigavafavaxoxinejap.pdfIn PDF document text
    • http://kfnmdg.com/upfolder/e/files/20210906010625.pdfIn PDF document text
    • http://doubles301.jp/files/ckeditor/files/75855397204.pdfIn PDF document text
    • http://zlzljc.com/uploadfile/file///2021090319204511.pdfIn PDF document text
    • http://makaroma.fr/upload/file/78883847920.pdfIn PDF document text
    • https://apoiotelecom.com/imagens/img_fckeditor/file/toxalazogusoneseniwomete.pdfIn PDF document text
    • http://tochalco.com/uploads/files/vadexom.pdfIn PDF document text
    • http://lagrupacio.cat/file/88536262163.pdfIn PDF document text
    • http://kutscher-customs.de/gfx/userfiles/files/mujejepugunegakatu.pdfIn PDF document text
    • https://polresseluma.com/assets/ckfinder/core/connector/php/uploads/files/65996951515.pdfIn PDF document text
    • https://candica.pl/ckfinder/userfiles/files/zataralodazajonozurajitu.pdfIn PDF document text
    • https://newshieldinsurance.com/demo/gsa/final/images/file/65085867697.pdfIn PDF document text
    • http://babijie.com/upload_fck/file/2021-9-16/20210916064731305019.pdfIn PDF document text
    • http://nhuaduongnhapkhauaz.org/upload/files/77075000695.pdfIn PDF document text
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/ad981f39604a483b2302c9089030a7f3/vabelopavirezixaxafu.pdfIn PDF document text
    • http://tai-yang.tw/taiyang/upload/file/71115077612.pdfIn PDF document text
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/4v8e0knh0tf0u9f04490qa686v/63399332154.pdfIn PDF document text
    • http://nfrostov.ru/upload/files/48755904200.pdfIn PDF document text
    • http://brezov-gaj.si/uporabnik/file/30047946039.pdfIn PDF document text
    • http://vervesimuhub.com/userfiles/file/pusifexugonabusaguwivanew.pdfIn PDF document text
    • https://www.renfrewareahealthvillage.ca/ckfinder/userfiles/files/60368791099.pdfIn PDF document text
    • https://ovistar-dz.com/ckfinder/userfiles/files/91295404892.pdfIn PDF document text
    • http://realfootball.gr/userfiles/file/6215154567.pdfIn PDF document text
    • http://fujiya-burbank.com/uploads/files/3900979943.pdfIn PDF document text
    • https://advik.net/userfiles/file/11549302025.pdfIn PDF document text
    • http://iuf.kr/pds_down/files/gajufuvekum.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=ink+sans+phase+3+addon+mcpePDF 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_off0000c567.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC567 10656 bytes
SHA-256: ada5c1854329c8a0feb1aa67ca4928fa50b2231a34d260ebba9aab6999313b08
font_01_sfnt_off0000dd9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD9C 20092 bytes
SHA-256: 8f306e639ef4746b213750c846bddc0155859aa6d3fa229a3cfd759668c0f0e3
font_02_sfnt_off000110f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110F9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1