Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab64a3c53a46b856…

MALICIOUS

PDF

86.0 KB Created: 2021-09-13 16:32:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 8432c6740252dfc0367feb07d6896cde SHA-1: b55181060990128d8dca6734da9a479c2d09a2ec SHA-256: ab64a3c53a46b856cc78843351001db39eb135636413bc82d92e8b5b34a5b098
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, with one heuristic specifically identifying it as a link farm on disposable hosting. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to lure users to malicious sites, aligning with spearphishing attachment tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://furniture83.com/upload/files/51208925029.pdf In PDF document text
    • https://ykitraders.com/UserFiles/file/19664185139.pdfIn PDF document text
    • https://dom4m.com/userfiles/files/sipor.pdfIn PDF document text
    • https://beldapin.com/calisma2/files/uploads/jogegezelo.pdfIn PDF document text
    • http://kondicionery-shodnya.ru/upload_picture/file/xitugobikoziba.pdfIn PDF document text
    • http://air-ned.com/uploads/files/1988786509.pdfIn PDF document text
    • https://bcm.es/files/galeria/files/govedaxososi.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/aoi8vm679vpp77viedh59mmch5/39262749240.pdfIn PDF document text
    • https://pgprojekt.pl/Upload/file/zotagupera.pdfIn PDF document text
    • https://fiscalonline.eu/app/webroot/files/userfiles/files/xesadujimogiwaxufemu.pdfIn PDF document text
    • http://spellenindex.nl/images/uploads/vupinewekavefulab.pdfIn PDF document text
    • https://motodubai.com/uploaded_images/files/15335612557.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613a906ec17a9---reluvojijebaporifujam.pdfIn PDF document text
    • https://learnrkb.jugalbandiresearch.com/ckfinder/userfiles/files/zekosusewe.pdfIn PDF document text
    • http://safires.cz/ckfinder/userfiles/files/xetemipaxujug.pdfIn PDF document text
    • http://scro.ru/pic/file/59581949535.pdfIn PDF document text
    • http://angel-conference.org/upload_fck/file/2021-9-11/20210911104805281018.pdfIn PDF document text
    • http://rts-3.ru/upload/files/97336270519.pdfIn PDF document text
    • http://kibbkw.com/uploads/files/93311852429.pdfIn PDF document text
    • http://www.catedralirodahaz.hu/data/editorfile/nufuzosarusozuxarukajowad.pdfIn PDF document text
    • https://saleskerala.com/ckfinder/userfiles/files/57608100683.pdfIn PDF document text
    • http://cmtsport.com/pliki/wuxirewumividenujateto.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=assassin%27s+creed+underworld+pdfPDF 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_off0000ebb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBB0 10716 bytes
SHA-256: 3799f8957f9d6300cbb37efc8a0c62fb6f5c1a233109e079dd0f734214b6f7f4
font_01_sfnt_off00010481.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10481 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011c93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C93 17544 bytes
SHA-256: 9b2aadd8e4aa05f670365c04aefc6aac1e396cb2d89c5e891f54ab0c97c4f3ac

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