Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d3a3c993e8b23e5…

MALICIOUS

PDF

85.7 KB Created: 2021-09-13 11:24:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 8f2c1940a0cf5c16a69c7d2680743725 SHA-1: 988a6048324e1ffa1a3888072cd5fc9720eb8bf6 SHA-256: 6d3a3c993e8b23e5796aa2f92aba51a9a6cb46a7fced7e8ea76528f89caf5ca6
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, with heuristics indicating embedded JavaScript and external URIs. The presence of embedded JavaScript suggests an attempt to execute malicious code within the PDF, likely to download or redirect to further malicious content. The numerous external URIs, many pointing to disposable hosting, reinforce the phishing or malware distribution intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://philabc.ru/uplcv?utm_term=android+phone+format+software+free+download PDF link annotation
    • http://ducthanggroup.com/webroot/img/files/jininibekenidojudazesunen.pdfIn PDF document text
    • http://arabstina.com/ckfinder/userfiles/files/33326673505.pdfIn PDF document text
    • http://mega.kz/media/upload/files/44268768962.pdfIn PDF document text
    • http://muzeumostrowiec.pl/obrazy/file/walotoxugobejanedi.pdfIn PDF document text
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bafcee4c1e---40516263377.pdfIn PDF document text
    • http://johnlillylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/neronob.pdfIn PDF document text
    • http://portalcom-b2b.es/img/user//file/_0553560001631278899.pdfIn PDF document text
    • https://chinatupai.com/web/js/ckfinder/userfiles/files/83037726967.pdfIn PDF document text
    • http://edituj.cz/res/file/48306277892.pdfIn PDF document text
    • http://xn--42cfa4ewb0a0b3fwh.com/imageupload/files/35100507800.pdfIn PDF document text
    • https://bursac.net/userfiles/file/kibidejuvolezesap.pdfIn PDF document text
    • http://fotografiafrancescosomma.com/userfiles/files/25815358762.pdfIn PDF document text
    • https://highlander-inn.com/assets/userfiles/files/76755796034.pdfIn PDF document text
    • https://regenerateacademy.com/file/bemifogimezire.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613eaf042a552---4005926955.pdfIn PDF document text
    • http://merrygoldholidays.com/ckfinder/userfiles/files/6698938622.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/16136f50cb049b---nezudulekolimokasefa.pdfIn PDF document text
    • https://ismart99.net/upload/files/75744457587.pdfIn PDF document text
    • https://grdr.org/paidel/ckfinder/userfiles/files/xukigogamevavetonuzoxo.pdfIn PDF document text
    • http://cainghienbinhduong.com/uploads/userfiles/file/50049357292.pdfIn PDF document text
    • http://canyonmeadows.org/userimages/zobozizatifanos.pdfIn PDF document text
    • http://abpjse.news-read.com/upload/files/70936254198.pdfIn PDF document text
    • http://alarmy-kamery24.pl/userfiles/file/ropuzirebilalele.pdfIn PDF document text
    • https://littleitalypizzany.com/nbloom/fckuploads/file/lobijebilosowuvutujimure.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_off0000e8e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8E5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000100f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100F7 17948 bytes
SHA-256: e0c0ea23073bd20dfec0c1f7f33b502986fd269f164e9cc64922db522371d2b2
font_02_sfnt_off00012fda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FDA 10832 bytes
SHA-256: 96414ba705212e0c6a9e2ad989c74cc9f7e3375d28814e11fdb6bd676fa45969