Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3aac9bf050a0bcd…

MALICIOUS

PDF

74.8 KB Created: 2021-09-21 18:26:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: e0d74b8af7ef6d6f9c7a0ce18007c652 SHA-1: ba904ef140e5592cf01d00f0be7eb1a346099fb4 SHA-256: f3aac9bf050a0bcdcd7e2556943ba24d9cdfb4aa732392b1929886f53674849c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, with heuristics indicating it functions as a link farm on disposable hosting. Numerous embedded URLs point to external sites, suggesting a phishing or malware distribution attempt. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of malicious intent, likely related to spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9827

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://catamma.ru/uplcv?utm_term=tere+naal+love+ho+gaya+full+movie+watch+online+free PDF link annotation
    • http://lachambredechos.com/userfiles/file/17923914913.pdfIn PDF document text
    • https://isitekmuhendislik.com/userfiles/file/14760346029.pdfIn PDF document text
    • http://aodaibooking.com/FileData/ckfinder/files/20210903_2F38B410F56CB6E7.pdfIn PDF document text
    • http://photo-preiss.com/upload_files/files/82944534408.pdfIn PDF document text
    • http://koyomisushi.com/uploads/files/dajeketetuvu.pdfIn PDF document text
    • https://ihappywash.com/uploads/files/202109200648394896.pdfIn PDF document text
    • http://chothuethietbi.info/img/files/jutokavagaxan.pdfIn PDF document text
    • http://harringtonassociateslaw.com/Test/JabzMedicalBillingService/userfiles/file/39750981753.pdfIn PDF document text
    • https://phuquiland.com/upload/files/21067258202.pdfIn PDF document text
    • https://monographie.com/ckfinder/userfiles/files/resexawi.pdfIn PDF document text
    • http://tupnate.com/ckfinder/userfiles/files/pisiwu.pdfIn PDF document text
    • https://blv.by/upload/editor/files/21458102914.pdfIn PDF document text
    • http://beta-rc.com/upload/files/tuwenawesuli.pdfIn PDF document text
    • http://zeshengtecphar.com/UploadFiles/FCKeditor/20210902060627.pdfIn PDF document text
    • https://ikincielinmak.com/upload/ckfinder/files/bolewobi.pdfIn PDF document text
    • http://master-br.ru/img/file/40945359605.pdfIn PDF document text
    • http://dangkydoanhnghiep.org/hinhanh_fckeditor/file/12417026467.pdfIn PDF document text
    • https://bacninhonline.com/webroot/img/files/49554778775.pdfIn PDF document text
    • http://chipublichouse.com/ckfinder/userfiles/files/pesujaxufojiba.pdfIn PDF document text
    • http://nhakhoasaigonkimcuong.com/uploads/images/files/67282180020.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/16145d4f3a6d13---29538207370.pdfIn PDF document text
    • http://rocincorporated.com/domain.com/images/dynamic_pages/file/derubugimisekega.pdfIn PDF document text
    • https://horizontire.com/userfiles/file/60806784319.pdfIn PDF document text
    • https://heart-calligraphy.com/uploads/files/202109020027417333.pdfIn PDF document text
    • https://mysmartedu.com/uploadimages/files/94417553029.pdfIn PDF document text
    • http://qamsar.org/userfiles/files/nagoniladubakoxi.pdfIn PDF document text
    • https://zhongzing.com/uploads/files/202109111645028384.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_off0000bea1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBEA1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d6b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6B3 17468 bytes
SHA-256: 7849565246f3dca89f4613fc11f4fb20b7086e100070bd34e352ade8a11317e4
font_02_sfnt_off000103d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103D0 10944 bytes
SHA-256: b59f176499a87c35f401e47bc01adfa7f57678e1c4ff5cfe9ce3da16eacecec1