Malicious PDF — malware analysis report

Static analysis result for SHA-256 cdd5b50965f3cf54…

MALICIOUS

PDF

78.7 KB Created: 2021-09-22 22:49:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: a666263647c1fd557f2b8fe19589da7d SHA-1: 1668e69c4d522ce851011c2d23d67b130bec7831 SHA-256: cdd5b50965f3cf54797b075dc8b2c256068bd7b74e4cd08696c75720b945c86f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The sample was flagged by ML and ClamAV as malicious, with specific heuristics indicating it functions as a link farm on disposable hosting. The embedded URLs and the PDF structure suggest an attempt to redirect users to potentially harmful sites, likely for phishing or malware distribution. No scripts were extracted, but the PDF structure itself is indicative of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://krisoc.ru/uplcv?utm_term=how+can+i+facetime+android+to+iphone PDF link annotation
    • http://zrdb-drogbud.pl/Upload/file/riwojapirenofajumu.pdfIn PDF document text
    • http://ehomeforeclosure.org/images/file/bugorigotisogimawimira.pdfIn PDF document text
    • https://arte-salon.ru/upload_picture/1078063908.pdfIn PDF document text
    • https://architektor.ru/uploads/file/19340439971.pdfIn PDF document text
    • https://4wheelchile.cl/admin/uploads/file/41822437756.pdfIn PDF document text
    • http://gzperson.com/uploadfile/files/64766126847.pdfIn PDF document text
    • https://amgaa.org/temp/files/suvowusuxozokezazobaxijuf.pdfIn PDF document text
    • http://tareeapartment.com/user_img/files/57011766427.pdfIn PDF document text
    • http://cabini.it/userfiles/files/fopigapepigasutudawivek.pdfIn PDF document text
    • https://binarbaidequipment.com/public_html/userfiles/file/bokukulekinijixozigu.pdfIn PDF document text
    • http://bladensburg.abwingsmd.com/uploads/files/lisabemivevogenuxadudazo.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/16148a65e11788---fejukifijuka.pdfIn PDF document text
    • http://yejida.com/userfiles/file/15221321185.pdfIn PDF document text
    • http://wignaccent.com/FCKeditor_2.6.3/userimages/file/20210915085337.pdfIn PDF document text
    • http://vevo.keresztessyoptika.hu/elemek/file/xivav.pdfIn PDF document text
    • https://www.naabelectric.com/userfiles/files/81733640149.pdfIn PDF document text
    • http://pro-customer.de/userfiles/file/89709374917.pdfIn PDF document text
    • http://xn--o39a91gvwm83kbsn.com/FileData/ckfinder/files/20210906_DC36F258BD49C3C4.pdfIn PDF document text
    • http://stacjaregeneracja.pl/userfiles/file/70212097080.pdfIn PDF document text
    • http://www.kyousei-fukushi.or.jp/system/ckfinder/userfiles/files/26853546804.pdfIn PDF document text
    • http://kvbm.org/pds/userfiles/files/wisebisifobenezil.pdfIn PDF document text
    • https://www.carnesvarejo.com.br/assets/ckfinder/core/connector/php/uploads/files/47621725274.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_off0000d054.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD054 10748 bytes
SHA-256: dce8d42b4e08e791b3e10c6517d290bb9ec7deed756306b3592c970d15fc701c
font_01_sfnt_off0000e8d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8D3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000100e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100E5 17272 bytes
SHA-256: 4c378ea32469304badf5045aa13753322d55750768ec799af16c2b1f53adcfbb

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