Malicious PDF — malware analysis report

Static analysis result for SHA-256 c04eb924b674126d…

MALICIOUS

PDF

80.6 KB Created: 2021-09-16 00:17:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: c7ebe2f73ec6bf4977ce64c79a6fa7fd SHA-1: 5919119994ed54005c6f34385ca7cabd45c4ed08 SHA-256: c04eb924b674126d52bf164595cd56cf1b2cb81758aedc72698df9966cbe4b19
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many pointing to disposable domains, and a heuristic identified it as a link farm. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to redirect users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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 http://100gastro.cz/soubory/files/narafopavememi.pdf In PDF document text
    • https://condominiovillage.com/userfiles/file/jesotizevenoxukebasu.pdfIn PDF document text
    • http://www.moyekolodin.com/files/tavepubojuxo.pdfIn PDF document text
    • http://chickenwild.com/upload/contents/images/images/mujunaterulawovegaxig.pdfIn PDF document text
    • http://slsnn.ru/content/files/71809389163.pdfIn PDF document text
    • http://bluelakehomestay.com/uploads/image/files/77947135580.pdfIn PDF document text
    • http://chalappuram.com/userfiles/file/radososunikirilolu.pdfIn PDF document text
    • http://exmar.it/foto_fck/file/jenovamadofofesi.pdfIn PDF document text
    • https://macauroommate.com/ckfinder/userfiles/files/8544136490.pdfIn PDF document text
    • http://designbeginnings.com/upload/file/duzarezuguwuda.pdfIn PDF document text
    • https://pacie.vn/web/uploads/files/jozakif.pdfIn PDF document text
    • http://vuoncotichdep.com/upload/files/bavibepiwobuxefaje.pdfIn PDF document text
    • http://chingyi.tw/userfiles/files/dagaboveroxidomu.pdfIn PDF document text
    • http://tamphuhiep.com/Images_upload/files/pisinanawogozuwopeb.pdfIn PDF document text
    • http://pointerboards.com/uploads/admin/files/naxenuze.pdfIn PDF document text
    • http://komodovo.ru/upload_picture/bipidokilurebufivila.pdfIn PDF document text
    • http://melvin.cz/data/91767948216.pdfIn PDF document text
    • https://rts-wm.com/ckfinder/userfiles/files/65863351037.pdfIn PDF document text
    • http://17njl.com/userfiles/files/midevavavovosowuvafet.pdfIn PDF document text
    • http://kramor.bg/userfiles/file/nobume.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/1612fff551e1b9---36729635554.pdfIn PDF document text
    • http://metallpress.info/files/xofojam.pdfIn PDF document text
    • http://marymo.ru/uploads/files/dakabajale.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=ppsspp+god+of+war+2+isoPDF 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_off0000d80e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD80E 10500 bytes
SHA-256: c9ba60da96aaa84781e63e27e656084a29946d2d31437eafa182020f5d40ef67
font_01_sfnt_off0000eff3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFF3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010805.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10805 17292 bytes
SHA-256: f67d85af4a3308ea63cfd544f0a51e0707c8e272edbcd6e946b5cc22f8f1d869

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