Malicious PDF — malware analysis report

Static analysis result for SHA-256 980c89e8d6ccf7e2…

MALICIOUS

PDF

87.7 KB Created: 2021-09-13 21:57:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 924f7b12726f9760092bc48dca78a464 SHA-1: d1a7be28d30a94516146f3efaa3ef3908f3b2d21 SHA-256: 980c89e8d6ccf7e22ac715e26dab7408286a59601f4ca3b5ef69576364b86810
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, and exhibits characteristics of a link farm. It contains numerous embedded URLs pointing to potentially malicious domains, suggesting an attempt to redirect users to phishing or malware hosting sites. The PDF structure and embedded content indicate it's designed to exploit user interaction to visit these external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://synerhu.ru/uplcv?utm_term=dual+boot+windows+10+dan+7 PDF link annotation
    • https://hobbyschuurtje-webwinkel.be/images/userfiles/file/68858953872.pdfIn PDF document text
    • http://surestegc.org/documentos/file/suduvagederipugojugiwu.pdfIn PDF document text
    • https://willmarareachamber.com/ckfinder/userfiles/files/vavetupubij.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b0d1856d10---58312973263.pdfIn PDF document text
    • https://sporyolu.com/resimler/files/boxudakegazagusin.pdfIn PDF document text
    • http://creaorganization.com/depo/sayfaresim/file/42411555396.pdfIn PDF document text
    • http://berallebags.com/UploadFiles/FCKeditor/20210905030341.pdfIn PDF document text
    • http://proreferee.ru/uploads/ckfinder/files/16068593237.pdfIn PDF document text
    • https://www.emcp-pmce.ca/_includes/ckfinder/userfiles/files/33549666180.pdfIn PDF document text
    • http://2016.letnifestiwal.pl/ckfinder/userfiles/files/mubobuxubarezewepepelo.pdfIn PDF document text
    • https://quimicasorocolor.com.ve/ckfinder/userfiles/files/87063092225.pdfIn PDF document text
    • http://eskuvotoszkanaban.hu/editor_up/begokufikesexusu.pdfIn PDF document text
    • http://precisao.net/files/files/27592576931.pdfIn PDF document text
    • http://dc-42351dc5a6b3.prshots.es/uploads/userfiles/1630643627/files/67849651783.pdfIn PDF document text
    • https://thietbixaydungcantho.com/canthomobile2/public/images/sanpham/files/zolebozikuraleradoz.pdfIn PDF document text
    • https://yaslibakicisi.net/userfiles/file/muwute.pdfIn PDF document text
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613aa642c3f7e---96147249454.pdfIn PDF document text
    • https://cauthinh.com/luutru/files/28664600177.pdfIn PDF document text
    • https://watosaphotography.com/app/webroot/userfiles/files/20210903_022223.pdfIn PDF document text
    • https://organicfertilizerproduction.com/d/files/fumusozezamon.pdfIn PDF document text
    • http://beta-rc.com/upload/files/meminaxabateje.pdfIn PDF document text
    • http://superfasttv.com/uploads/files/17242628237.pdfIn PDF document text
    • https://www.supremecaravans.com.au/application/third_party/ckfinder/userfiles/files/43979231731.pdfIn PDF document text
    • http://motorlustor.net/userfiles/file/68111070214.pdfIn PDF document text
    • https://maffart-guy.com/userfiles/file/fasiwevazesaxidekikona.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_off0000f105.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF105 18320 bytes
SHA-256: 3b953112a88a49f473e133b176dd36dce6fac6bf82001670a4d5a9724a2e2b8f
font_01_sfnt_off000120b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120B6 10560 bytes
SHA-256: d440421b3446ff5c7898b8ceca2c300daebfee15b46ecd3b575b521c7cca6c13
font_02_sfnt_off00013904.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13904 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1