Malicious PDF — malware analysis report

Static analysis result for SHA-256 be319ead679e4e0b…

MALICIOUS

PDF

79.9 KB Created: 2021-09-21 05:48:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 88a30e6e0b87fae6c20cd7185cc19b80 SHA-1: 90ef840d7b9acd76dc2dbff3cc8107ab25be41f4 SHA-256: be319ead679e4e0b7b2c23b669efc7bb943d789f9ee4bdb72cc35a6bdc5022e8
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The sample was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains embedded JavaScript and numerous external URIs, suggesting it is designed to redirect users to potentially malicious websites. The PDF structure and embedded content point towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://synerhu.ru/uplcv?utm_term=offline+video+chat PDF link annotation
    • http://stroytehcentr.ru/images/file/13820154136.pdfIn PDF document text
    • http://safiorida.nl/operatori/userfiles/file/64136496758.pdfIn PDF document text
    • http://my-hustle.net/FCKeditor/editor/filemanager/connectors/php/connector.php?Command=FileUpload&Type=File&CurrentFolder=%2Ffile/tipug.pdfIn PDF document text
    • https://hunghiephuylog.com/upload/files/41727638313.pdfIn PDF document text
    • https://intrastorg.com/userfiles/file/definoje.pdfIn PDF document text
    • http://spalovnachemolak.sk/userfiles/file/tamiramudinuk.pdfIn PDF document text
    • http://xn--brneneskontor-landsforening-b0c.dk/userfiles/file/60786620473.pdfIn PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130671e61d2c---84986872990.pdfIn PDF document text
    • https://medbioplast.com/klucharnet/images/file/13936792283.pdfIn PDF document text
    • http://maduraicaterers.com/app/webroot/js/ckfinder/userfiles/files/4689443296.pdfIn PDF document text
    • https://emilline.dk/ckfinder/userfiles/files/69101581012.pdfIn PDF document text
    • http://wenxuezj.com/images/File/65152542147.pdfIn PDF document text
    • https://themalc.org/files/file/wekuli.pdfIn PDF document text
    • http://bushurov.ru/images/files/25060265613.pdfIn PDF document text
    • https://rockyhotelsgroup.com/uploaded/files/96241443673.pdfIn PDF document text
    • https://tivirtual.com/userfiles/file/85614008699.pdfIn PDF document text
    • http://www.kevimotor-rock.hu/files/files/povuloxevefaxizukuga.pdfIn PDF document text
    • https://dailyiat.com/html_upload/file/fitizamaduvaxasefivesur.pdfIn PDF document text
    • http://astprom.ru/sites/default/files/file/figumasavuboz.pdfIn PDF document text
    • https://network-italia.it/file/28518604692.pdfIn PDF document text
    • http://hb1004.com/userData/board/file/tilexobunanegafosegam.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_off0000d41d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD41D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ec34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC34 10396 bytes
SHA-256: 8e6ef04fedb8d9070408c972530271c0ee4bb36871aac39dd091110f9ef7878a
font_02_sfnt_off000103a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103A6 17916 bytes
SHA-256: eac3d2cd8482ec847657a374f1d88efdbaa7ac1e339485fbb9c430cfb7c0a9d4

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