Malicious PDF — malware analysis report

Static analysis result for SHA-256 93af5bbf73aeb95c…

MALICIOUS

PDF

88.6 KB Created: 2021-09-09 08:03:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: ad499f673b9dacceecb76e13f96041cc SHA-1: a215ab1253d16209a373aab5d530208e6a48e73b SHA-256: 93af5bbf73aeb95ce3ceeee6e51a7a0b2ab8fb53c6f6c86d3417d645420280b7
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to download and execute a second-stage payload. The presence of numerous external URIs, many pointing to PDF files on disposable domains, suggests a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9795

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://nileagriculturalindustries.com/file/rovojutepo.pdf In PDF document text
    • http://physio-praxismitte.de/userfiles/gemeturubesarebodivar.pdfIn PDF document text
    • http://aven.su/userfiles/file/7170539091.pdfIn PDF document text
    • https://www.lire-les-notes.com/ckfinder/userfiles/files/gegozamujerukugej.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/taxafenitigixomumigabukef.pdfIn PDF document text
    • http://inventory-acepipe.com/images/uploads/files/wawomizeniraratukedef.pdfIn PDF document text
    • http://mtecommerce.it/public/news/file/fuzijebafajit.pdfIn PDF document text
    • http://perechen-jurnalov.ru/js/ckfinder/userfiles/files/ridupasotimuwugafidisadi.pdfIn PDF document text
    • https://gogift-it.com/userfiles/files/fifukag.pdfIn PDF document text
    • http://dejede.com/userfiles/file/fimin.pdfIn PDF document text
    • http://n3ss.ro/ckfinder/userfiles/files/mefodek.pdfIn PDF document text
    • http://polipadel.com/userfiles/file/96811696298.pdfIn PDF document text
    • http://nkmate.com/FileData/ckfinder/files/20210903_7CCF2C37700FB3D1.pdfIn PDF document text
    • https://diedacorporation.net/freesiafiles/file/69528828755.pdfIn PDF document text
    • https://myvideoclasses.com/ci/userfiles/files/13113198506.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/4028653743.pdfIn PDF document text
    • http://navigator-nsk.ru/userfiles/file/50940284312.pdfIn PDF document text
    • http://gespk.com/userfiles/file/miwixuteze.pdfIn PDF document text
    • http://travellightnepal.com/userfiles/file/54567275007.pdfIn PDF document text
    • http://haai.org/upload/file/jetapopidedaxogedobap.pdfIn PDF document text
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/1b8305eda19e67cd56e86fdbf067477a/kaxaxasidezag.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613157563699d---75088651138.pdfIn PDF document text
    • http://patroha.hu/file/tawivedenumumesiluxulada.pdfIn PDF document text
    • http://kingalbertltd.com/uploadedfiles/file/64590871559.pdfIn PDF document text
    • http://tcyy88.com/userfiles/file/2021090304573273499.pdfIn PDF document text
    • https://dancleland.com/img/upload/file/10646834954.pdfIn PDF document text
    • http://huanghels.com/filespath/files/20210907003531.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=bts+universe+story+game+apkPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d658.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD658 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ee69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE69 18540 bytes
SHA-256: 5f25d1512d71e824503099cd63a15ab76347b997cb421a7ed2923f49733987b1
font_02_sfnt_off00010bb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BB2 10976 bytes
SHA-256: 8be9197e5198c44602df09418248aa5b469af0ec8ef989641843b66df3a6eaa2
font_03_sfnt_off0001254d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1254D 18184 bytes
SHA-256: 16e9b43836b38a718eb14293f70dcec3106ced04bcc3fd54bb7dcd4957772088