Malicious PDF — malware analysis report

Static analysis result for SHA-256 a73334589c373012…

MALICIOUS

PDF

93.3 KB Created: 2021-09-09 03:25:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: ea967570eeb2783ff77accff0158c3ab SHA-1: 1d027d3674e7a3485d2f7fd047c73c6b7ceb5d3c SHA-256: a73334589c373012862aa24ba2cf60e9e4632910104e84a2d7e917a3d2d6c1ee
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to link farms on disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to trick users into downloading further malware or visiting phishing sites. The presence of embedded JavaScript suggests an attempt to execute malicious code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9897

Heuristics 6

  • 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.
  • 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 http://geoplan.su/userfiles/file/8870870012.pdf In PDF document text
    • https://sma-dfgg.org/site/admin/file/23981390202.pdfIn PDF document text
    • https://melnikhouse.com/userfiles/file/86849267710.pdfIn PDF document text
    • http://sladkiy-ostrov.ru/userfiles/files/66642203846.pdfIn PDF document text
    • https://hgb.se/filer/file/pewapemuzijixelorimel.pdfIn PDF document text
    • http://jeykrishnaclub.com/images/file/44284172783.pdfIn PDF document text
    • http://ucinnovation.ru/admin/ckfinder/userfiles/files/55964068900.pdfIn PDF document text
    • http://tunapvietnam.thietbiotoviet.com/Images_upload/files/vugegeparezo.pdfIn PDF document text
    • http://nsfeed.com/_UploadFile/Images/file/80302913814.pdfIn PDF document text
    • https://turbooto.vn/upload/files/386205218.pdfIn PDF document text
    • https://aslplastic.com/ckfinder/userfiles/files/99738690506.pdfIn PDF document text
    • http://www.lasallelille.com/admin/ckfinder/userfiles/files/tejikulunakiziteza.pdfIn PDF document text
    • http://psystems.gr/Administrator/uploads/userpics/OutPostImages/files/motefus.pdfIn PDF document text
    • http://www.smartlandgroup.com/ckfinder/userfiles/files/siviwizame.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161392930a4ad4---99974494153.pdfIn PDF document text
    • http://e3edu.vn/public/ckfinder/core/connector/php/connector.phppublic/uploadsfiles/67437319977.pdfIn PDF document text
    • http://noavarservice.com/ckfinder/userfiles/files/35672475960.pdfIn PDF document text
    • https://rewaqousha.net/userfiles/files/83654078018.pdfIn PDF document text
    • http://wxbeimei.cn/upload/ckimg/files/202109021824599469.pdfIn PDF document text
    • https://coebmsf.com/userfiles/file/zejopuruxop.pdfIn PDF document text
    • http://wirtrauenuns.ch/images/file/xevirupadan.pdfIn PDF document text
    • http://canadianartistic.com/userfiles/file/rozoparavefolisigasimapir.pdfIn PDF document text
    • http://www.cda.org.hk/ckfinder/userfiles/files/nakoxafigupuzisudo.pdfIn PDF document text
    • http://jilienjrubin.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/65501202340.pdfIn PDF document text
    • http://nbc.ua/design/pic/file/50041519133.pdfIn PDF document text
    • https://bookmyexcellence.com/bookmyexcellence/js/ckfinder/userfiles/files/nofodofiwuruv.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=minecraft+apk+free+download+latest+version+1.16PDF 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_off0001067b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1067B 17684 bytes
SHA-256: 0b0a9e49c9214a14f022f983e5131b014e52ad16d90023c73dd87ba840acbe24
font_01_sfnt_off000134b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134B1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014cc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14CC8 11136 bytes
SHA-256: 70d8d7e3f26f147ab76173c2f99f7f80d77136ed3083712becf91613f06f2a1f