Malicious PDF — malware analysis report

Static analysis result for SHA-256 cfd25b17d331cec0…

MALICIOUS

PDF

78.3 KB Created: 2021-09-19 18:56:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 5008e806f6cead10ffea622e62b61fe2 SHA-1: e44e27e6374ec1bda2ef38a3cdc2d0894d18069e SHA-256: cfd25b17d331cec03d8533ac01737e52e76aa08ddb02d0f2dd7a4112ee84b2d9
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, flagged by ML classifiers and ClamAV as malicious. It also contains numerous external URIs pointing to PDF files, indicating a link farm designed to redirect users. The embedded JavaScript likely facilitates the redirection or exploits vulnerabilities to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://cancunday.com/travela/img/files/kodorozamigerubemefilof.pdf In PDF document text
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/16140a10006aca---60992995378.pdfIn PDF document text
    • https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/ffb9b533072a0099c4003073c8b2239b/15256078208.pdfIn PDF document text
    • http://gearonlaw.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/sejugi.pdfIn PDF document text
    • https://autoandtruckrepair.net/nbloom/fckuploads/file/lasewega.pdfIn PDF document text
    • https://wonkingchina.com/d/files/wifiriworulamoku.pdfIn PDF document text
    • http://deleersnijder-bocaege.be/images/file/tinenavubapafoluxoten.pdfIn PDF document text
    • http://xn----1-6cdapb2bdyqawnpcindqfc.xn--p1ai/media/file/dezuna.pdfIn PDF document text
    • https://smsenerji.com/resimler/files/nujaxomigupokeka.pdfIn PDF document text
    • http://veitali.com/upload/files/somonufomow.pdfIn PDF document text
    • http://www.benyowsky.com/resources/files/tolujewokud.pdfIn PDF document text
    • http://kortennis.co.kr/B/ck/ckfinder/userfiles/files/jexolajusuvilaxenezes.pdfIn PDF document text
    • http://thegioichuyendong.info/app/webroot/upload/files/ledafuligolizenomoja.pdfIn PDF document text
    • http://eis-pieschel.de/UserFiles/File/baxelagemuzobimasejirare.pdfIn PDF document text
    • https://juniorclublivorno.com/sitonews/images_upload/files/golijigowotasamividu.pdfIn PDF document text
    • http://susasoft.com/upload/userfiles/files/75313156190.pdfIn PDF document text
    • https://atvatextile.com/upload/ckfinder/files/4695673952.pdfIn PDF document text
    • https://karatenarrewarren.com.au/ckfinder/userfiles/files/sowamenadupetagamimudoziz.pdfIn PDF document text
    • http://crystal-lamp.ru/uploads/files/40964112672.pdfIn PDF document text
    • http://vouchertiket.com/airplane/ckeditor/uploads/files/13569056002.pdfIn PDF document text
    • https://www.l-games.jp/js/ckfinder/userfiles/files/79671945044.pdfIn PDF document text
    • http://haohanlegend.com/Uploadfiles/files/55106934018.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=android+notification+shadePDF 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_off0000cf49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF49 10508 bytes
SHA-256: 8a7e8cfa802e129d3f2d96edc971dd280903b08fbfca72fadde6f0a9876fa51c
font_01_sfnt_off0000e729.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE729 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ff3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF3B 17264 bytes
SHA-256: c041ac3f3c97d0a448bfb69029f7528c76255b7a5d38b0b0ebf2f784a937f494

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