Malicious PDF — malware analysis report

Static analysis result for SHA-256 a04a1bc664991941…

MALICIOUS

PDF

83.4 KB Created: 2021-09-09 09:31:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 09ef71647ce037c40c2548b68137b1df SHA-1: 8876cba0f5792a7b182d0545ce8b434a8e1c6ea7 SHA-256: a04a1bc664991941d864a66059cc2fbe784c652994c360e9d7f0921b3f01852d
126 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. It contains numerous external URIs and is identified as a link farm on disposable hosting, suggesting it's designed to redirect users to potentially harmful websites. The presence of embedded URLs further supports this, likely serving as a lure for phishing or malware downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://wastran.ru/uplcv?utm_term=hojas+de+esquemas+de+mayor+para+imprimir+pdf PDF link annotation
    • http://siblom.ru/files/upload/file/gasimavenix.pdfIn PDF document text
    • http://csc0898.com/userfiles/file/20210901231306_wmyn2c.pdfIn PDF document text
    • https://lawina-radom.pl/files/file/movedepalamojuvuj.pdfIn PDF document text
    • http://clinical-pain.com/pds/userfiles/files/jimanepefivawijulolo.pdfIn PDF document text
    • http://chinajessie.com/seadata/data/uploads/img/file/163085065168.pdfIn PDF document text
    • http://stellarp.com/userfiles/file/37336666496.pdfIn PDF document text
    • https://yifff.se/userfiles/file/307736345.pdfIn PDF document text
    • https://jazykovytabor.topenglish.sk/app/webroot/gallery/files/9161908969.pdfIn PDF document text
    • http://yugang360.com/upload_fck/file/2021-9-8/20210908031409452230.pdfIn PDF document text
    • http://teknis.it/userfiles/files/4703986681.pdfIn PDF document text
    • http://talcmanagement.com/uploaded_files/userfiles/files/12593764108.pdfIn PDF document text
    • http://burragebrothers.org/demo/jolie/beta/userfiles/files/47727185508.pdfIn PDF document text
    • http://www.gieskestukadoors.nl/ckfinder/files/files/mumonevokofirexujilanonu.pdfIn PDF document text
    • http://aapltd.net/userfiles/file/masodofurig.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ffc15e8102---92374654880.pdfIn PDF document text
    • http://g-shocktou.com/user_file/file/midosukowoxofojonamurij.pdfIn PDF document text
    • https://candica.pl/ckfinder/userfiles/files/28934333573.pdfIn PDF document text
    • http://jamalcar.com/userfiles/file/72161787113.pdfIn PDF document text
    • http://jawarakreasi.com/file/76315391007.pdfIn PDF document text
    • https://premiumvipbusiness.com/wp-content/plugins/super-forms/uploads/php/files/33ea9ecfe48f34c3f8fc609ef434a5e5/xaxudufaxowosu.pdfIn PDF document text
    • https://rts-wm.com/ckfinder/userfiles/files/fenowuwi.pdfIn PDF document text
    • http://divapharma.com/uploaded/file/61956827202.pdfIn PDF document text
    • http://mcdanielz.eu/files/file/filukas.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_off0000dc63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC63 19524 bytes
SHA-256: 1925fdf18b1ca2c68522c75677c0254da434534423014e8b30e2bf5bf6d546a3
font_01_sfnt_off00010e38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E38 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001264f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1264F 10892 bytes
SHA-256: 64627d4cf5c726b64dd822b32351bc1e59d6055ade37bbb8397c192a8cb5731e

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