Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a8f0156eca447ca…

MALICIOUS

PDF

86.1 KB Created: 2021-09-22 10:53:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: d57b4fe6c81a7bd631e158bd816caf85 SHA-1: 0c7da58238d189ba920eeb77448a244ac1fc285a SHA-256: 7a8f0156eca447ca6b8a71d41255f7bcdf7a543295a71e39e7a93e18efcc4865
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as a malicious PDF by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains embedded JavaScript and numerous external URIs, many of which point to PDF files on potentially disposable hosting, suggesting a link farm or phishing lure. The presence of embedded JavaScript indicates an attempt to execute malicious code within the PDF viewer.

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://zenmobile.in/jaipriyart/uploads/files/xojewifuxinumudeti.pdf In PDF document text
    • http://dalnoboy.org/data/filestorage/upload/files/25807123142.pdfIn PDF document text
    • https://rwd.webseo.tw/upload/files/gusifipotenukujakujegega.pdfIn PDF document text
    • https://domilot.com/uploader/files/pazavagaxalefebunavu.pdfIn PDF document text
    • http://el-master.ru/userfiles/file/22686440757.pdfIn PDF document text
    • http://soleilboo.com/images/uploads/files/33907226391.pdfIn PDF document text
    • http://infinity8talents.com/userfiles/file/tuwaroluvogisemebofubevif.pdfIn PDF document text
    • http://xn----8sbfhu6ab4bqv.xn--p1ai/userfiles/file/purapipubetowivefu.pdfIn PDF document text
    • https://vipbeachhouse.com/uploads/editor/file/faxetimakara.pdfIn PDF document text
    • http://szamosiszerviz.hu/feltoltott/files/56534867294.pdfIn PDF document text
    • http://sieuthibds.net/images/files/dalenimod.pdfIn PDF document text
    • https://venusnvs.com/userfiles/file/gemagijenifokenapelu.pdfIn PDF document text
    • http://konferencii.org/js/ckfinder/userfiles/files/mizedejeto.pdfIn PDF document text
    • http://isystemlab.com/admin/ckfinder/userfiles/files/toxuvazo.pdfIn PDF document text
    • https://jamurgoreng.net/contents/files/45418598468.pdfIn PDF document text
    • http://vegman-kzn.com/ckfinder/userfiles/files/jutagenedepakugiliximo.pdfIn PDF document text
    • https://seeyounow.net/userfiles/file/sepalexebegafa.pdfIn PDF document text
    • http://targhevaticane.it/userfiles/files/3611957551.pdfIn PDF document text
    • https://sanvexe.vn/webroot/img/files/nobelagudevufasorivubabed.pdfIn PDF document text
    • http://meta-min.com/files/riduminijanevig.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/161392220c3d89---pavipopele.pdfIn PDF document text
    • http://logiccpacma.com/ckfinder/userfiles/files/lavezafipemaz.pdfIn PDF document text
    • http://okna-dvere-online.cz/media/upload/upload/file/85683459132.pdfIn PDF document text
    • http://pusheng168.com/uploadfiles/20210922074853.pdfIn PDF document text
    • http://odnoklassniki-files.ru/images/uploads/files/90782315194.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=android+mixer+appPDF 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_off0000eed9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEED9 17180 bytes
SHA-256: 895de0f054c9da43c75036129acee98ef6de4ca3e363406b163969832b961ba2
font_01_sfnt_off00011b38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B38 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001334f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1334F 10324 bytes
SHA-256: 94dc30bad0beccd25455bfaee424bc4942165b1f5368c1f8622d1cf942da8b52