Malicious PDF — malware analysis report

Static analysis result for SHA-256 d242f540ffe3d9d6…

MALICIOUS

PDF

68.2 KB Created: 2021-09-28 13:56:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: e7c571785b8b49b65ba96d791bce726e SHA-1: 8de72ced8f31fc8566e0d8f897f4326e7e88ec22 SHA-256: d242f540ffe3d9d699e5fa81d300a99f3991015724b1117b567aca604f08e8cb
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many of which are hosted on disposable domains, suggesting a link farm or phishing lure. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM specifically points to this behavior, and the presence of external URIs further supports this. No scripts were extracted, but the overall structure and URL distribution are consistent with phishing campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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://studiomuraca.eu/userfiles/files/98423456181.pdf In PDF document text
    • https://megalightgroup.lv/uploads/files/14496864911.pdfIn PDF document text
    • https://ans5680.preneed91.com/upload/files/talikezikofemedo.pdfIn PDF document text
    • http://constantemails.com/userfiles/file/163199267273967356305.pdfIn PDF document text
    • http://ageofwonders.buka.ru/sadm_files/52106100384.pdfIn PDF document text
    • https://hamzakocakoglu.com/userfiles/file/42550583910.pdfIn PDF document text
    • http://henanshuangxin.com/d/files/47547387463.pdfIn PDF document text
    • http://fioredda.com/userfiles/files/10199178266.pdfIn PDF document text
    • http://caytrong.vn/Images_upload/files/lisaf.pdfIn PDF document text
    • https://viceda.com/userfiles/file/jopodaseburodutuzeva.pdfIn PDF document text
    • https://prestinieurope.com/userfiles/files/lejoxufikopugu.pdfIn PDF document text
    • https://drivetripper.com/userfiles2020/files/20614181399.pdfIn PDF document text
    • http://thenext.pk/userfiles/files/21734713374.pdfIn PDF document text
    • http://fizjoactiv.eu/Upload/file/dogin.pdfIn PDF document text
    • http://turatabor.hu/media/68896025278.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16146fff46698f---45262562116.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/e139bc5c013697805e64c129717b5adf/16224256804.pdfIn PDF document text
    • http://propack-th.com/image/upload/File/wefinipuwoxaxona.pdfIn PDF document text
    • https://abogadosaccidentealicante.centralcms.cloud/galeria/files/92000278490.pdfIn PDF document text
    • http://npi-management.com/ressource/site-image/files/32579522619.pdfIn PDF document text
    • http://ghettaetamionarchitetti.it/userfiles/files/20313838216.pdfIn PDF document text
    • https://clinicaabrahaoosta.com.br/ckfinder/userfiles/files/40484998515.pdfIn PDF document text
    • https://pagodatalk.com/_UploadFile/Images/file/latinejezapotepela.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=games+for+android+icecream+sandwichPDF 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_off0000ad52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAD52 10724 bytes
SHA-256: 3d499293546da50b6c74ec9cc9defc47fd00b36a922636578ec6a849ceaa1b1f
font_01_sfnt_off0000c5d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5D0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000dde2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDE2 14788 bytes
SHA-256: e6d4c2ca3680f950e1664b79bec1619b3f9783e5e3d571788e1091a4603e821d

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