Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b5fd7321558e19a…

MALICIOUS

PDF

91.0 KB Created: 2021-09-19 01:47:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 9011e5f5f0f3544ffb4af239270d8f7c SHA-1: a0957f7d6b60c48bc92b2b5b442fd830f8b8af09 SHA-256: 9b5fd7321558e19abdb4a131b8a365700cae797fcd0b81b40513c5c2b3fcde5a
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to suspicious domains and are structured as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious documents designed to redirect users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://gestaocipa.com/public_html/Imagens/file/galovekoromufopatem.pdf In PDF document text
    • http://tbeaindia.com/userfiles/file/28908053314.pdfIn PDF document text
    • https://eco-translation.ca/upload/editor/file/43484405361.pdfIn PDF document text
    • http://kingalbertltd.com/uploadedfiles/file/xufevitupaluwexibig.pdfIn PDF document text
    • http://atek-ent.com/upload/file/54254248500.pdfIn PDF document text
    • https://chorland-dining.com/webroot/editor-uploads/files/31663077457.pdfIn PDF document text
    • http://konikanarrowfab.com/ckfinder/userfiles/files/61428721549.pdfIn PDF document text
    • http://fotosvatba.net/userfiles/file/tudesigodigixiz.pdfIn PDF document text
    • https://tl-systems.hu/files/files/dizetirotakus.pdfIn PDF document text
    • https://lynnesnaturaltreats.com.au/wp-content/plugins/super-forms/uploads/php/files/75c19818ebb2869012989e7c33e3f2e7/jojuporure.pdfIn PDF document text
    • http://namlinhchisapa.com/userfiles/image/file/30476652858.pdfIn PDF document text
    • http://yuhao-tech.com/userfiles/file/5519150869.pdfIn PDF document text
    • http://thesecurityguardunion.ca/userfiles/files/89130409291.pdfIn PDF document text
    • http://oticonshop.net/ckfinder/userfiles/files/xopitebezotakutudoxuvol.pdfIn PDF document text
    • http://jd6618.com/jd6618/file/2021-9/file/LwpCms2021_09_19_02_12_47_2936.pdfIn PDF document text
    • http://rrbrentacars.com/files/others/xomilubonuzugav.pdfIn PDF document text
    • https://joepromenshealth.com/wp-content/plugins/super-forms/uploads/php/files/070e2eaced117f1551ae5ffee639eeba/45232636540.pdfIn PDF document text
    • https://webkapper.nl/ckfinder/userfiles/files/34302067978.pdfIn PDF document text
    • https://pjkconstruction.ca/images/file/toweropuxeroz.pdfIn PDF document text
    • http://elitk.ru/_files/22058480219.pdfIn PDF document text
    • http://rideco.hu/upload/file/jawivo.pdfIn PDF document text
    • http://mgocsm.in/userfiles/file/6238025429.pdfIn PDF document text
    • https://fasleh.net/Files/files/zufelamuxetivenesi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=play+theory+in+early+childhoodPDF 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_off0000fe5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE5A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001166c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1166C 17960 bytes
SHA-256: 09865d23137c05b7cfe1b125438c9bf4e94435afe564c00343997ff5b9da46cd
font_02_sfnt_off00014523.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14523 10412 bytes
SHA-256: 0fb745410030480d0491a409098b29dfa2b6d855c16974dd2446bdde869a39ed

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