Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9894f5af1ffc2c6…

MALICIOUS

PDF

85.6 KB Created: 2021-09-14 00:03:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: ffa1ee877ce124c0bdc9e2b882b14b7e SHA-1: 18066603100163b0232b0e127387f8dcdf828ca6 SHA-256: b9894f5af1ffc2c6c4181508935cf64abc498e5c34bbcb1629b0e48929de76c5
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, with heuristics indicating it functions as a link farm on disposable hosting. ClamAV and ML classifiers strongly indicate maliciousness, specifically phishing. While no scripts were directly extracted, the PDF structure and embedded links suggest an attempt to redirect users to malicious sites, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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 https://www.creativetalentnetwork.com/ckfinder/userfiles/files/97929814003.pdf In PDF document text
    • http://fructusartis.com/i/File/wapavibizavuzisugonilegix.pdfIn PDF document text
    • http://clinicaveterinariacene.com/userfiles/files/77685263317.pdfIn PDF document text
    • http://garantc.ru/userfiles/file/gibugerivovemexer.pdfIn PDF document text
    • https://prestinireedcorp.com/userfiles/files/50975427225.pdfIn PDF document text
    • http://iamsong.vn/uploads/files/kasakupugiwixugibowara.pdfIn PDF document text
    • http://olynskiconstruction.com/pics/file/70493667302.pdfIn PDF document text
    • http://winfielddeli.com/ckfinder/userfiles/files/pamefofuwilujipan.pdfIn PDF document text
    • http://kameleonhastanc.hu/files/file/60704187296.pdfIn PDF document text
    • http://elencostruzioni.it/userfiles/files/83888605238.pdfIn PDF document text
    • http://bio-scan.com/userfiles/file/87179563948.pdfIn PDF document text
    • http://leeandrewdavison.com/download/nomopit.pdfIn PDF document text
    • http://www.iuoelocal870.com/kaizen/ckfinder/userfiles/files/79291489623.pdfIn PDF document text
    • https://pasifikendustriyel.com/userfiles/file/33885960910.pdfIn PDF document text
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/219ff32d676bf60a24562e7dff26cca1/75535438552.pdfIn PDF document text
    • https://pushtypathshala.com/demo/aims/files/images/files/90000440750.pdfIn PDF document text
    • http://freeski.hu/freeski/file/67944339594.pdfIn PDF document text
    • http://missteenqueenuk.com/userfiles/file/xubero.pdfIn PDF document text
    • http://hiroi-es.info/yamituki-n/uploads/files/21607767369.pdfIn PDF document text
    • http://imhkayseri.com/resimler/files/lolukobazugem.pdfIn PDF document text
    • https://eletroluz-al.com/_IMG/img_internas/file/riviwukadezagenoxo.pdfIn PDF document text
    • https://smsenerji.com/resimler/files/36449951569.pdfIn PDF document text
    • https://fullhousetourism.com/UploadFiles/file/20210909230752155.pdfIn PDF document text
    • http://automotiveenergy.cz/userfiles/file/18643757437.pdfIn PDF document text
    • https://jdsliquorlocker.com/nbloom/fckuploads/file/74001268958.pdfIn PDF document text
    • http://formpart.com/upload/ckfinder/files/51410078936.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=gomovies+fear+the+walking+deadPDF 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_off0000e7e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7E8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fffa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFFA 17968 bytes
SHA-256: cd21ca32bb12ab35012a5713e38f66bf89ca43e18142253011d8e42a2c544a1f
font_02_sfnt_off00012e8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E8C 11084 bytes
SHA-256: f21ae008b81c870e94aa822a1e7ac8c93a0eda8baa488585c745d4b4fdcde242