Malicious PDF — malware analysis report

Static analysis result for SHA-256 dac5e2f073830279…

MALICIOUS

PDF

72.9 KB Created: 2021-09-08 14:13:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 5edf799ba19abd416c58b094d09993c0 SHA-1: 1567e846662649f7f1bd65ffa83fcbb555cd5dbb SHA-256: dac5e2f0738302799aabf18b4a43e316cfed6dff69b077120e14a5ff3701dfff
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous external URIs and is flagged as a link farm on disposable hosting, suggesting it's part of a phishing or malware distribution scheme. While no scripts were explicitly extracted, the PDF structure and embedded URIs are consistent with techniques used to deliver second-stage payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 https://smidgel.ru/uplcv?utm_term=yoga+for+beginners+pdf+download PDF link annotation
    • https://adikkedua.com/contents/files/29597658291.pdfIn PDF document text
    • http://i-physiology.ru/upload/vudafudifukotufunisobosi.pdfIn PDF document text
    • http://donauwell.at/userfiles/file/5266249999.pdfIn PDF document text
    • http://mobilahomedesign.com/userfiles/files/lojetamedojuvo.pdfIn PDF document text
    • http://apsencollege.org/test/fckeditor/file/panizedumuwezavu.pdfIn PDF document text
    • http://twfbs.com/ckfinder/userfiles/files/42710038842.pdfIn PDF document text
    • http://vegman-kzn.com/ckfinder/userfiles/files/76518635444.pdfIn PDF document text
    • https://flcevent.fcu.edu.tw/plugin/ce1/ckfinder/userfiles/files/20210907145230.pdfIn PDF document text
    • http://thermogroup.ru/uploads/files/lunimupetenuxipelev.pdfIn PDF document text
    • http://gewoongroen.eu/app/webroot/files/userfiles/files/lakiwubekekuxopaxa.pdfIn PDF document text
    • http://vibestedu.com/_UploadFile/Images/file/5561179200.pdfIn PDF document text
    • http://imobilestore.de/userfiles/file/napuzipejinusokepodomaruj.pdfIn PDF document text
    • https://soenen-pneus.com/upload/file/torud.pdfIn PDF document text
    • http://konberdbio.com/upload/files/28591221490.pdfIn PDF document text
    • http://leaguengn.com/userfiles/file///seduvironujagik.pdfIn PDF document text
    • https://soechi.com/userfiles/file/fowizibakutozuxateruxadov.pdfIn PDF document text
    • https://mttrasportisrl.it/dati/upload/file/25300795003.pdfIn PDF document text
    • https://oriental-kitchens.com/userfiles/files/xutidaka.pdfIn PDF document text
    • http://detaycopymatbaa.com/userfiles/file/87443763891.pdfIn PDF document text
    • http://kondicionery-noginsk.ru/upload_picture/file/bikigelulemebe.pdfIn PDF document text
    • http://jysfh.com/upload_fck/file/2021-9-8/20210908105313200908.pdfIn PDF document text
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1612fa877637a6---14574115587.pdfIn PDF document text
    • http://buren-kompanie.de/userfiles/files/liporavusiparevimodiret.pdfIn PDF document text
    • 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_off0000bbbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBBBE 10784 bytes
SHA-256: 626faf620faa64b95215c04ab7a26cabc24a9691bdecf3233006879eaebbb50f
font_01_sfnt_off0000d447.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD447 16400 bytes
SHA-256: 6397376e5993aad6a908eae65302c6b8171814bac929ded811da077477dac436
font_02_sfnt_off0000fe31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE31 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1