Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b9934520a74c83d…

MALICIOUS

PDF

85.3 KB Created: 2021-09-17 22:00:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 6d5b119859adc6dac9ffbe0efda8276a SHA-1: 0917779b8216232911909775c6387e8b40159a36 SHA-256: 9b9934520a74c83d73f56952b8e98008e0c3d2dd31240c9ec0547e1d19e65442
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous external links, some of which are part of a link farm, and one URL points to a potential download. The presence of a 'download button' heuristic further supports the phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://oniceh.ru/uplcv?utm_term=joox+premium+apk+download PDF link annotation
    • http://fszhenjia.com/upfolder/e/files/20210917195007.pdfIn PDF document text
    • http://abc-tel.ru/data/File/junupejilej.pdfIn PDF document text
    • http://dgelc.com/userfiles/file/20210911141055.pdfIn PDF document text
    • http://thailaundry.com/imgUpload/files/xenofosujuxizuvetulazoko.pdfIn PDF document text
    • http://lorichphoto.com/pictures/file/58432690057.pdfIn PDF document text
    • http://timnhanhonline.com/upload/files/48555735911.pdfIn PDF document text
    • https://anninhsieuthi.online/upload/files/jipixevazekekipe.pdfIn PDF document text
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/6206fe540c57d6d30cbb300cbf559380/42523507664.pdfIn PDF document text
    • https://marblobaths.com/app/webroot/img/files/pejonegiriniwapukipol.pdfIn PDF document text
    • http://malovanesklomh.cz/images/file/ridefaxufajanejomap.pdfIn PDF document text
    • http://blbr365.com/userfiles/file/1630498986.pdfIn PDF document text
    • https://dodatkireklamowe.pl/web/uploads/files/99844664410.pdfIn PDF document text
    • https://gotoko.com/cmsv2/upload/files/2210724217.pdfIn PDF document text
    • https://highlander-inn.com/assets/userfiles/files/73449881103.pdfIn PDF document text
    • http://veiligheidssloten.nl/ckfinder/userfiles/files/fusasoziwe.pdfIn PDF document text
    • http://mnarch.it/userfiles/files/tedifo.pdfIn PDF document text
    • http://corporatiegids.nl/uploads/files/40431678974.pdfIn PDF document text
    • http://thietbikhachsanvinhhung1.com/upload/files/19007760022.pdfIn PDF document text
    • https://jamuiboe.com/webroot/upload_media/37195636255.pdfIn PDF document text
    • http://encino.ilovepokebar.com/uploads/files/18889940099.pdfIn PDF document text
    • https://norservis.cz/files/files/vofoz.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fdcf3668ee---wuwojetaxulaj.pdfIn PDF document text
    • https://vanrun-it.nl/userfiles/files/zaginubuvofowameledasapiz.pdfIn PDF document text
    • https://dampinggame.com/calisma2/files/uploads/67294385950.pdfIn PDF document text
    • http://ozt.zielonetarasy-cieplice.pl/uploads/userfiles/files/bitolanutatalaja.pdfIn PDF document text
    • http://alicekhenrylawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/60117525119.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_off0000e600.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE600 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fe17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE17 10656 bytes
SHA-256: bdd4eff2ebad999b17b53ea8de919de0b832e30af1124637c8f6a2d4646ae46d
font_02_sfnt_off0001167a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1167A 19152 bytes
SHA-256: c91b020c077445977307cfe53eb12b894b84104a2430066c2244e5493788643d