Malicious PDF — malware analysis report

Static analysis result for SHA-256 980af3fb9207d1b9…

MALICIOUS

PDF

75.1 KB Created: 2021-09-10 09:28:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: a866936dc1a536d71708001083caa24b SHA-1: cf2f22cd4a34867181a330140fb41682181be063 SHA-256: 980af3fb9207d1b9921b3262419b635797399e475cbf7eacc74d55bb002c2f10
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The ML classifier and ClamAV detection strongly indicate malicious intent. The PDF contains numerous embedded URLs, many of which point to suspicious domains, suggesting a phishing or link-farming scheme. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating the PDF is part of a link farm designed to distribute malicious content or phish users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://stattus.com/assets/file/zotasamakomagiwom.pdf In PDF document text
    • http://locke-3c.tw/uploads/files/202109051000316540.pdfIn PDF document text
    • http://neuchina.org/userfiles/file/sifixixo.pdfIn PDF document text
    • http://aokunoil.com/ckfinder/userfiles/files/51483646657.pdfIn PDF document text
    • http://le-nora.com/userfiles/file/35275002136.pdfIn PDF document text
    • https://holcom-wd.holcom.vn/webroot/img/files/mipimuwoxovom.pdfIn PDF document text
    • http://headrepublic.pl/images/files/69044422338.pdfIn PDF document text
    • https://optimuselearningschool.aels.edu/learning/site/images/uploadfiles/rugigisafoniwojevanadim.pdfIn PDF document text
    • http://cascinamana.it/userfiles/file/66494761660.pdfIn PDF document text
    • http://sgadsahodayatarntaran.org/sahodyatarntarannew/userfiles/file/42517236470.pdfIn PDF document text
    • http://world-housing.jp/ckfinder/userfiles/files/67194869498.pdfIn PDF document text
    • https://staging-info.sharkovinkom.com/sharkovinkom.com/ckfinder/userfiles/files/mepenadufupovezureb.pdfIn PDF document text
    • https://wsbe17hongkong.hk/_bin/ckfinder/userfiles/files/61078086540.pdfIn PDF document text
    • https://tspinstruments.com/cache/fck_files/file/2665615499.pdfIn PDF document text
    • http://calisnt.com/uploads/files/xetemujazibinokifokavo.pdfIn PDF document text
    • http://gr-chem.com/upload/files/11360600130.pdfIn PDF document text
    • http://komputerzagrosze.pl/userfiles/file/logupimapi.pdfIn PDF document text
    • http://kayapalinakliyat.com/file/11360481606.pdfIn PDF document text
    • http://ledseoul.com/userData/board/file/98223945313.pdfIn PDF document text
    • http://duocthientam.com/uploads/ckfinder/files/joferelujodisutafadupux.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16132f19534ae5---44644535142.pdfIn PDF document text
    • http://seattleteriyaki3.com/uploads/files/vizowesidafaxaja.pdfIn PDF document text
    • http://sksound.com/userfiles/file/kulofuvagogadixibexufubon.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=connect+phone+to+tv+usb+cablePDF 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_off0000c2a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2A7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dab9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAB9 17400 bytes
SHA-256: 84d4d86c2be32e54405995f37a853c4ceb1848e40ad785fa515deb701d05a649
font_02_sfnt_off00010749.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10749 10616 bytes
SHA-256: 2c6d2f095a781cfd70590c5c933ee5f537b5cb311ced073e7773aac16361f11b

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