Malicious PDF — malware analysis report

Static analysis result for SHA-256 979341a40bae11dc…

MALICIOUS

PDF

70.0 KB Created: 2021-09-27 02:52:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: ab63beecb0b4788219fba6d279778e4f SHA-1: ed4719198339ad92c39d62e07f77eaf532b6dab8 SHA-256: 979341a40bae11dc4ecd46597750e34224aa3016464b5a2c1d7bd9a5ec8b1bf4
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and is flagged by ML classifiers and ClamAV as malicious. It also exhibits characteristics of a link farm, with numerous external URIs pointing to disposable domains, suggesting an attempt to phish or distribute malware. The embedded JavaScript likely facilitates the redirection or download of a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://alburigiott.it/userfiles/files/33042499642.pdf In PDF document text
    • http://driver-jazda.pl/upload/file/dikelafazewoluf.pdfIn PDF document text
    • http://hiredriver.com/uploads/assets/files/bixexupavixafunigoju.pdfIn PDF document text
    • http://varvshistoriska.com/file/kubod.pdfIn PDF document text
    • http://xn--djr00fsyfv0o5qgy9u.net/filespath/files/20210902091246.pdfIn PDF document text
    • http://naim.naparts.com/images/fck/file/21134911139.pdfIn PDF document text
    • http://titadoorbinhduong.com/upload/files/jatebilovegumumepaf.pdfIn PDF document text
    • http://eternoohydro.com/d/files/jalixabanafu.pdfIn PDF document text
    • http://bobmeetin.com/media/galleries/files/notuvozifana.pdfIn PDF document text
    • http://quimis.org/js/ckfinder/userfiles/files/kadanidonilixow.pdfIn PDF document text
    • https://mediaskills.rs/files/47942130280.pdfIn PDF document text
    • http://ecolservizinettuno.com/userfiles/files/48450101917.pdfIn PDF document text
    • http://serramentisiciliano.it/userfiles/files/muriniwozirak.pdfIn PDF document text
    • http://criollo-cocoa.com/userfiles/file/juxilikurone.pdfIn PDF document text
    • http://exclusivelimoservice.com/ckfinder/userfiles/files/xakujosorisukedobe.pdfIn PDF document text
    • https://renault-service.com/userfiles/98830265329.pdfIn PDF document text
    • http://dulichtantai.com/files/uploaded/files/zefulonamuborilivowenite.pdfIn PDF document text
    • http://kadh.kr/bobod/upload/file/nuwizu.pdfIn PDF document text
    • http://modaxch.com/userfiles/files/33319792843.pdfIn PDF document text
    • http://canhtoanland.com/upload/files/zipufesitozeloju.pdfIn PDF document text
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141de7454796---dudutupifigidepezisokuwi.pdfIn PDF document text
    • http://lucchetta.net/userfiles/files/43117577603.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=spooks+series+3+episode+5PDF 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_off0000b10d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB10D 10448 bytes
SHA-256: da51ea3ea049def835ba13ef89c919cb7cab9e1823bd96cdaa1a9b04e0ff9cd5
font_01_sfnt_off0000c8dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8DC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e0ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0EE 16256 bytes
SHA-256: 0104fbaee0cf5479ed578577f680f4be7dce1fcde56406a58998c0a6f28b2908

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