Malicious PDF — malware analysis report

Static analysis result for SHA-256 0fa4c0bd155709f2…

MALICIOUS

PDF

81.5 KB Created: 2021-09-13 09:37:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: aaf3d3a5531e39504f313a375b013995 SHA-1: 1dec3204ccb0505d0c216f4a5aa87509742f1219 SHA-256: 0fa4c0bd155709f206fdea905d01b08106aaf1c30394ce8a8c4ce26006c434eb
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of embedded JavaScript and numerous external URIs, many pointing to PDF files on potentially disposable hosting, suggests this PDF acts as a lure to download further malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports the idea that this document is part of a campaign to distribute malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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 http://nj-rshb.com/v15/Upload/file/202193849416546.pdf In PDF document text
    • http://miryangpension.com/FileData/ckfinder/files/20210912_953883281473D7AE.pdfIn PDF document text
    • http://sinhorelli.com/userfiles/file/wazepod.pdfIn PDF document text
    • http://mayinmaunhat.com/upload/files/gipave.pdfIn PDF document text
    • http://bronnicy.inhome360.ru/admin/ckfinder/userfiles/files/doxebejubolajelinuvi.pdfIn PDF document text
    • http://tatishev.ru/admin/ckfinder/userfiles/files/meziresazipufimotevelis.pdfIn PDF document text
    • http://sonnenheizung.ch/fckeditor/editor/images/file/terabetamafuwume.pdfIn PDF document text
    • http://gerastar.com/userfiles/file/xafolebigifowa.pdfIn PDF document text
    • http://cpghollywood.com/userfiles/files/92051457248.pdfIn PDF document text
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/ggmc2l6tn55l1u3oqbd8a0a7d7/73091551881.pdfIn PDF document text
    • http://furnitura-syndicat.ru/ckeditor/ckfinder/core/connector/php/uploads/files/lapiwosapidiravidobef.pdfIn PDF document text
    • http://satit.nrru.ac.th/satit/_Adminis/ckfinder/userfiles/files/tojepafefug.pdfIn PDF document text
    • https://ezsprinting.com/userfiles/file/jifedazapepupe.pdfIn PDF document text
    • https://mingyi-lock.com/data/file/userfiles/files/4677545781.pdfIn PDF document text
    • https://astoraccessories.com/uploads/ckfinder/files/13054974140.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d177a6ebf8---miwaxaxoragekipus.pdfIn PDF document text
    • http://carshopm.com/js/upload/files/zosumu.pdfIn PDF document text
    • http://peoplefoster.com/pliki/wonaki.pdfIn PDF document text
    • http://www.gamylai.vn/uploads/files/20392838570.pdfIn PDF document text
    • http://penzion-u-zamku.cz/files/file/42157302692.pdfIn PDF document text
    • http://expertworker.paraleumarian.ro/app/webroot/files/userfiles/files/19840992748.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=urdu+keyboard+for+android+mobilePDF 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_off0000d243.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD243 10700 bytes
SHA-256: 019893706734b5ffa90f53d5deed5f76251ee6b25ebf5b3494747662ee847837
font_01_sfnt_off0000eabd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEABD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000102cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102CF 20424 bytes
SHA-256: 8c3aa1933f38804c1aa074463de7ad78b81a374ccf65e5042e809501c2593f51

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