Malicious PDF — malware analysis report

Static analysis result for SHA-256 413a52a7a773ca8a…

MALICIOUS

PDF

83.0 KB Created: 2021-09-12 22:17:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-27
MD5: 477b024c6a9d7a437ceff8e75f9971cf SHA-1: 19798f52d018b608d90eb65d2a40e8bf7697b6d2 SHA-256: 413a52a7a773ca8aa19b39806de385de30c6d0c8ffd140797bbfeb0af6d5bb05
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are hosted on potentially disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were directly extracted, the structure and URL patterns are consistent with malicious PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://careersourcechipola.com/files/public/xolufitagosesonunolig.pdf In PDF document text
    • http://avandcie-energy.com/ckfinder/userfiles/files/11219293711.pdfIn PDF document text
    • http://coyada.com/up_images/up_images/gobukafavozukozobibu.pdfIn PDF document text
    • http://gelateriacool.it/userfiles/files/rowikozubunujapa.pdfIn PDF document text
    • https://pointswestliving.com/ckfinder/userfiles/files/mapatimifogukesekabiwexa.pdfIn PDF document text
    • https://fleuriste79.fr/ckfinder/userfiles/files/rubegoxusozo.pdfIn PDF document text
    • https://marwaservicecenter.com/nbloom/fckuploads/file/kisoderebujipibusakufip.pdfIn PDF document text
    • http://carrasvilla.es/uploads/files/62614596391.pdfIn PDF document text
    • http://gruaszarate.com/ckfinder/userfiles/files/89232221374.pdfIn PDF document text
    • http://harringtonassociateslaw.com/Test/JabzMedicalBillingService/userfiles/file/labapixexara.pdfIn PDF document text
    • https://padservhosting.com/userfiles/file/67378063328.pdfIn PDF document text
    • https://elearning-chemistry.ro/userfiles/file/nazadapajabagazujerisivo.pdfIn PDF document text
    • http://laptopcuhaiphong.vn/upload/files/xidijinaginuzav.pdfIn PDF document text
    • http://americasbestwingspa.iorderfoods.com/uploads/files/71924835536.pdfIn PDF document text
    • http://mehmetrasimmutlu.com/icerik/file/tusij.pdfIn PDF document text
    • http://giaexploring.it/userfiles/files/37091745770.pdfIn PDF document text
    • http://tovicetour.com/FileData/ckfinder/files/20210912_256FF8042B80C654.pdfIn PDF document text
    • https://westhigienia.hu/editor_up/danenasulonilevone.pdfIn PDF document text
    • http://z-him.ru/userfiles/file/61700658052.pdfIn PDF document text
    • http://irvine.songhakbbq.com/uploads/files/50586487615.pdfIn PDF document text
    • http://old.bgk-meshkova.com/ckeditor/ckfinder/userfiles/files/5521660009.pdfIn PDF document text
    • https://paintingwithapassion.com/nbloom/fckuploads/file/moguv.pdfIn PDF document text
    • https://perfecthospital.org/ckfinder/userfiles/files/zobigemulerevav.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=ld+player+for+laptopPDF 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_off0000dc21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC21 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f433.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF433 19604 bytes
SHA-256: 360702f4b40957e7c6a9b665d8fc57e1b2ebfaea60749f7f4da5295d09f63604
font_02_sfnt_off000127d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127D3 10196 bytes
SHA-256: e6b409ad3f5f90d2c3f01d03bbab85d9cceaf8be3cea75eb30bb70ed0df939bf