Malicious PDF — malware analysis report

Static analysis result for SHA-256 7655fbfbf409bc8a…

MALICIOUS

PDF

83.1 KB Created: 2021-09-11 06:25:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: e914b78544990826c6112fe395cff9b3 SHA-1: ada900015be4d13c19ecba85c60d04ee2fd92b6a SHA-256: 7655fbfbf409bc8a07f36a1dcde41a9364f06d557c5c71816a404ef2cd7383ae
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file with embedded JavaScript, flagged by ML classifiers and ClamAV as malicious. It also functions as a link farm, directing users to numerous external URLs, likely for phishing or malware distribution. 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-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 https://cructi.ru/uplcv?utm_term=camscanner+pdf+apk PDF link annotation
    • http://dabaizhongxue.com/upload_fck/file/2021-9-9/20210909210836150997.pdfIn PDF document text
    • https://banerjeetourspecial.in/ckfinder/userfiles/files/10959888589.pdfIn PDF document text
    • http://www.phsdcenter.com/temp/js/ckfinder/userfiles/files/xadop.pdfIn PDF document text
    • http://www.prakashirrigation.com/uploads/fck/files/3866032549.pdfIn PDF document text
    • http://nedvizhimost-v-sharm-el-sheikhe.ru/uploads/files/77707910345.pdfIn PDF document text
    • https://b2b-intelligence.it/uploads/file/vewuvubodizidawowexaxep.pdfIn PDF document text
    • http://audyt.rowerowaszkola.pl/imgturysta/files/10210381710.pdfIn PDF document text
    • http://charontrade.hu/data/file/65793490735.pdfIn PDF document text
    • https://kanat.com/upload/ckfinder/files/76488353781.pdfIn PDF document text
    • https://solelane.com/ckfinder/userfiles/files/kusosif.pdfIn PDF document text
    • http://arcdesantmarti.com/biocop/Images/images-editor/file/12933017045.pdfIn PDF document text
    • http://panel2conso.com/userfiles/file/fozivetuxijevamos.pdfIn PDF document text
    • https://clubkdo.fr/img/pics/files/40505479445.pdfIn PDF document text
    • https://prestinireedcorp.com/userfiles/files/gobuvuxiwowonadujewi.pdfIn PDF document text
    • http://holzbau-napetschnig.at/belizugatufawanupuko.pdfIn PDF document text
    • http://trlgpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/37741792079.pdfIn PDF document text
    • http://richmore.kr/uploadfile/fckeditor/file/98775282547.pdfIn PDF document text
    • https://www.corpeverest.com/ckfinder/userfiles/files/62012802889.pdfIn PDF document text
    • http://a2hgghk.handylover.com/upload/files/damaxekuxo.pdfIn PDF document text
    • http://unibox.lv/files/text/39733925130.pdfIn PDF document text
    • http://timeyear-v.com/userfiles/file/97658918547.pdfIn PDF document text
    • https://hgb.se/filer/file/15213738239.pdfIn PDF document text
    • http://vinhthuan.vn/upload/files/dakekidemesebepazizenuza.pdfIn PDF document text
    • https://phu-komplex.pl/pliki/file/85609259816.pdfIn PDF document text
    • http://timandlor.com/userfiles/file/suredi.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_off0000dfb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFB9 18168 bytes
SHA-256: 236230db19afa6792890b883c053782fba377542ec3812a2f80203fe11137478
font_01_sfnt_off00010ebb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EBB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000126d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126D2 10548 bytes
SHA-256: 12541b102631bf2fd23ed98422acd964ab9ca5919f6f11d68c0caa2c293f3f60

Open this report in the interactive analyzer, or submit your own file for analysis.