Malicious PDF — malware analysis report

Static analysis result for SHA-256 5175672a38198238…

MALICIOUS

PDF

81.4 KB Created: 2021-09-14 22:25:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 12a1ec2099164bee600777ceb839bfac SHA-1: 4046a4671849d77c609cc604157e6b5dd22efcb4 SHA-256: 5175672a381982388a2155e162a00eab043e4f5a3a44a30e9f12c17f1f7a8ffb
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which are hosted on disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a common technique for initiating malicious actions within PDF documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://synerhu.ru/uplcv?utm_term=best+ios+tower+defense+game PDF link annotation
    • http://globalbizkorea.com/userData/board/file/papelesuzat.pdfIn PDF document text
    • https://laetitiabernard.fr/images/file/15699082906.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140d98d975f3---jureru.pdfIn PDF document text
    • https://lucky-erotic-massage-bucharest.ro/ckfinder/userfiles/files/12647015820.pdfIn PDF document text
    • http://likuidart.com/files/ckeditor/files/25794335832.pdfIn PDF document text
    • http://studiopol.com/userfiles/files/84507268816.pdfIn PDF document text
    • http://akvatoria.by/UserFiles/files/54684154545.pdfIn PDF document text
    • https://blogsma.com/files/50065241377.pdfIn PDF document text
    • http://szyqjsj.com/UploadFile/file/20210902203900227.pdfIn PDF document text
    • http://teen.plovdivweek.com/js/ckfinder/userfiles/files/finoturotabemusig.pdfIn PDF document text
    • https://peoplesmodelinternational.com/ckfinder/userfiles/files/nafolaxapawilawuxenokog.pdfIn PDF document text
    • http://baheth24aqari.com/ckfinder/userfiles/files/kalamufib.pdfIn PDF document text
    • http://studiotecnicomartani.eu/userfiles/files/bimerinuzafuxanukewufepaf.pdfIn PDF document text
    • https://gemicilojistik.com/userfiles/upload/file/jasaxazepuzebizefikuk.pdfIn PDF document text
    • http://teraval.cz/res/file/bepofuzulisi.pdfIn PDF document text
    • http://rsst77.ru/upload/files/zurerudivumazana.pdfIn PDF document text
    • http://pk.mo/userfiles/file/63519400685.pdfIn PDF document text
    • http://morecoredesign.com/images/imageUps/files/89320910970.pdfIn PDF document text
    • https://dacinsara.ro/fckfiles/file/dimuvojetikofewowetipafa.pdfIn PDF document text
    • http://soupworld.de/upload/file/85428150082.pdfIn PDF document text
    • http://bakineshr.az/ckfinder/userfiles/files/sotawenaviw.pdfIn PDF document text
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/ae070d9aeba1b2e382d2145a51e11a54/sorarivabawatubipizix.pdfIn PDF document text
    • https://ev-owners.jp/userfiles/files/84704823159.pdfIn PDF document text
    • http://uniquehotelsolutions.com/files/others/wadafarixosatukefijewude.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_off0000dc98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC98 10792 bytes
SHA-256: 014b19cb78f1a0d135324b269149606b29d1cf9e97854eb6e6219e7d54e315d7
font_01_sfnt_off0000f554.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF554 16472 bytes
SHA-256: de3dc6f1ef4be9287859e07a00b00eb9fa9c7b29f31c0eaf12101e5d463b960e
font_02_sfnt_off00012013.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12013 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1