Malicious PDF — malware analysis report

Static analysis result for SHA-256 0d15cb8293a4bfe5…

MALICIOUS

PDF

74.3 KB Created: 2021-09-14 21:23:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 51ee37c60ab0718f3a58a1b666ddfd4b SHA-1: f7cbbfb2b018ed6e4b21d7d4f62fb6e1d6dae44c SHA-256: 0d15cb8293a4bfe59a82ffa0b48596f1752351f0a9dc12b4fc0c6cd22468cbad
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to disposable hosting and are part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The embedded JavaScript is a common technique for initiating malicious actions within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://irlanc.ru/uplcv?utm_term=windows+7+ultimate+64+bit+download+torent PDF link annotation
    • https://thietbixanh.net/uploads/files/46675504672.pdfIn PDF document text
    • http://maezawa-jidousha.com/js/upload/files/68868192866.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613753ee7eb04---kagemagu.pdfIn PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16140462a0a363---71048831866.pdfIn PDF document text
    • http://naphotelbangkok.com/userfiles/files/28657338546.pdfIn PDF document text
    • https://maturana.cl/upload/file/pawepiketigetokewiwusijur.pdfIn PDF document text
    • http://downtowncincyhotels.com/core_degree/admin/images/cms_imagesfiles/pawopezozik.pdfIn PDF document text
    • http://busangh.com/attfile/fckimg/file///2021091321749_852597287.pdfIn PDF document text
    • https://onhimalayas.com/ckfinder/userfiles/files/19495207662.pdfIn PDF document text
    • http://bimbrlata.cz/UserFiles/File/batef.pdfIn PDF document text
    • http://canoto.us/Images_upload/files/88981981309.pdfIn PDF document text
    • http://templeton.sk/userfiles/file/woxoragesafofedok.pdfIn PDF document text
    • http://airzo.net/userData/board/file/fepurivunubo.pdfIn PDF document text
    • https://posetili.ru/userfiles/file/misasupijajijizitutiju.pdfIn PDF document text
    • http://tuvanthanhlapcongty.biz/upload/ck/files/78444301831.pdfIn PDF document text
    • https://altonika.pro/files/fck/file/49454168709.pdfIn PDF document text
    • http://kapsalonindex.nl/images/uploads/70069313657.pdfIn PDF document text
    • https://inarsindbari.org/uploads/37007592709.pdfIn PDF document text
    • https://ukmalayalamnews.com/userfiles/file/xutebovuligat.pdfIn PDF document text
    • http://albertopizzetti.it/userfiles/files/26575388581.pdfIn PDF document text
    • https://marblo.com/app/webroot/img/files/midezumariwawoxumakamaka.pdfIn PDF document text
    • http://7sate.com/filespath/files/20210901230651.pdfIn PDF document text
    • http://dentalclinicbangalore.com/uploads/70330102974.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_off0000beec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBEEC 16552 bytes
SHA-256: e8929101750afde8a256f8f8c1c165b38f221d2b0506ef812a5d529aa289ddaf
font_01_sfnt_off0000e95f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE95F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010176.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10176 11024 bytes
SHA-256: bdea6d36728795bc816223a15673bf47ddccb1aa34eff94a9e2a52ff9e597073

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