Malicious PDF — malware analysis report

Static analysis result for SHA-256 972287307081639a…

MALICIOUS

PDF

83.8 KB Created: 2021-09-15 15:56:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 0c14761562a4b8d3fd9fdd0c5bb71f8d SHA-1: 13301421af5e187aa2aabf620dc4aff01c5686b8 SHA-256: 972287307081639a0745c06954d14e090b62d44215c0eab6a8feb2aff900d235
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm with numerous external URIs, including one that presents a deceptive download button. While the document body is unreadable, the combination of these factors suggests a phishing attempt designed to trick users into downloading a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://www.waetsukai.jp/system/ckfinder/userfiles/files/26494427075.pdf In PDF document text
    • http://nakamurasangyou.jp/app/webroot/uploads/files/fisufebokopasodupuvisura.pdfIn PDF document text
    • http://andlupa.com/userfiles/file/87604683888.pdfIn PDF document text
    • https://wedding-photos.cz/userfiles/file/10502200967.pdfIn PDF document text
    • http://www.enjoyvaltellina.it/admin/ckfinder/userfiles/files/gotitowemiwoboxovinineb.pdfIn PDF document text
    • https://deesudcoolingtower.com/userfiles/file/luxijagapeduvimuxe.pdfIn PDF document text
    • https://viadagio.be/userfiles/file/kafufezebed.pdfIn PDF document text
    • https://highrise.pl/file/21249835696.pdfIn PDF document text
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613c020598987---54844593101.pdfIn PDF document text
    • http://seghers.kr/data/editor/file/75225252761317357b17cc.pdfIn PDF document text
    • http://angel-conference.org/upload_fck/file/2021-9-7/20210907043156128797.pdfIn PDF document text
    • https://gtijsr.com/userfiles/file/kosisezutuwuwovoponeze.pdfIn PDF document text
    • http://sellmysayarah.com/userfiles/files/nexerawawemefesajud.pdfIn PDF document text
    • https://baruipur.org/ckfinder/userfiles/files/sudev.pdfIn PDF document text
    • https://satellietgroep.nl/userfiles/files/kuberowezapokatipofax.pdfIn PDF document text
    • https://highrise.pl/file/witetusosavezugo.pdfIn PDF document text
    • http://xn--90aoaidn.xn--p1ai/ckfinder/userfiles/files/26337649518.pdfIn PDF document text
    • https://rajaunited.com/contents/files/16746626645.pdfIn PDF document text
    • http://sp3siemianowice.pl/userFiles/files/rukuki.pdfIn PDF document text
    • https://cultureresortpokhara.com/assets/userfiles/files/91147616533.pdfIn PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614106ee44db8---52448528527.pdfIn PDF document text
    • http://chrislahoda.ca/userfiles/file/jajenazifaruj.pdfIn PDF document text
    • http://xn--9w3b270a7kf.kr/data/editor/file/97938039453.pdfIn PDF document text
    • https://cornwallstaffagency.com/userfiles/file/76699789273.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=zynga+poker+unlimited+moneyPDF 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_off0000e1cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1CF 17996 bytes
SHA-256: 392a71bd90ddcb7b12a04ba6a0920feb7238fe3473df9184375e0684b1e42809
font_01_sfnt_off000110b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110B4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000128cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128CB 10836 bytes
SHA-256: fda2f6e686df9c145bd1a9b51bda2621f6cfd1d7281da9b58489f72c80b714be