Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc9002bfa8f9a433…

MALICIOUS

PDF

72.6 KB Created: 2021-09-20 16:26:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 7d58652c3034b6f2a0999c0e57a815f3 SHA-1: 409487c09532fc8a57a769560dc1d80fd7707fd7 SHA-256: fc9002bfa8f9a433a8e9b7941d52356d1636477b16b0cee7806019dc326a98f5
126 Risk Score

Malware Insights

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

The sample is a PDF file flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains numerous embedded URLs, many of which point to disposable domains and appear to be part of a link farm. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a non-clustered link farm on disposable hosting, suggesting a phishing or malware distribution attempt. No scripts were extracted, but the presence of external URIs and the link farm structure strongly suggest a malicious intent to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 5

  • 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.
  • 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://drafthe.ru/uplcv?utm_term=cops+n+robbers+map PDF link annotation
    • http://electric-kernbichler.at/gokudafifo.pdfIn PDF document text
    • http://www.agenbenangbandung.net/file/30043803761.pdfIn PDF document text
    • http://vuonlan.vn/data/upload/files/galafebi.pdfIn PDF document text
    • https://sanipacific.com/attachment/file/zetatuwotererukikobiku.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c9ef754017---16873938411.pdfIn PDF document text
    • http://ettermanenterprises.com/ckfinder/userfiles/files/76001131032.pdfIn PDF document text
    • https://permargi.com/files/galeria/files/51584070982.pdfIn PDF document text
    • http://boothbayharborshipyard.com/userfiles/file/wazigaboj.pdfIn PDF document text
    • http://ipea.kr/userData/board/file/nuluduz.pdfIn PDF document text
    • https://bazk.info/public_htmluploads/file/14545846129.pdfIn PDF document text
    • http://hidropro.hu/upload/67393472063.pdfIn PDF document text
    • http://riverhouse.at/pcms/content/file/momepukidipi.pdfIn PDF document text
    • http://huynhgiabaohotel.com/uploads/FCK/file/19045464705.pdfIn PDF document text
    • http://www.aceitunasdelguadalhorce.es/ckfinder/userfiles/files/sibopogopofonupakafatogi.pdfIn PDF document text
    • http://industra.sk/userfiles/file/13675868552.pdfIn PDF document text
    • https://ginniglobal.com/uploads/file/kuzijixu.pdfIn PDF document text
    • http://tele-fonika.pl/upload/file/83774721660.pdfIn PDF document text
    • http://poultech.net/d/files/guvenigix.pdfIn PDF document text
    • https://noventa.cz/media/files/file/47454392122.pdfIn PDF document text
    • http://tropo-design.com/ckfinder/userfiles/files/78108931850.pdfIn PDF document text
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f097515e3b---43302057023.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/72205010522.pdfIn PDF document text
    • https://hotelpancharatna.com/assets/userfiles/files/71903794116.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_off0000b892.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB892 17472 bytes
SHA-256: b834788c2d529801df784a6e7bf9e61e5276bcd5a87640ae2699a3498cf4c548
font_01_sfnt_off0000e588.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE588 10348 bytes
SHA-256: c73c9e0a71049623e28dbe4a2546e8dc090381c043793e7d48e03cb525d0afbd
font_02_sfnt_off0000fca6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCA6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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