Malicious PDF — malware analysis report

Static analysis result for SHA-256 e1f191a3ce697c21…

MALICIOUS

PDF

73.5 KB Created: 2021-09-23 06:35:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: f6b45b7f6e8c08ad65459d85c04be26a SHA-1: 6f2df5476aed0dffc6f2e4dd4218b2c0cfb317ea SHA-256: e1f191a3ce697c2118f3918384fe1d3ebf0b3b51329b80f8e8d3413efbbcd246
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URIs and is described as a link farm on disposable hosting, suggesting it's used to redirect users to potentially harmful sites. While no scripts were explicitly extracted, the PDF structure and embedded URIs point towards a phishing or malware distribution vector, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://pixomot.ru/uplcv?utm_term=how+to+make+a+gif+on+android+from+photos PDF link annotation
    • https://fivetc.vn/uploads/files/92234566281.pdfIn PDF document text
    • http://urbanconstructions.org/images/uploadedimages/file/33769513035.pdfIn PDF document text
    • https://kottayammedicalcollege.org/CMS/ckfinder/userfiles/files/9105895917.pdfIn PDF document text
    • http://pokemom2.com/uploads/files/biwafosavavisuxo.pdfIn PDF document text
    • http://lindendirect.com/tempimg/file/waberadetevumisarukuwipuf.pdfIn PDF document text
    • https://merlak.ru/userfiles/file/23113511298.pdfIn PDF document text
    • http://amexeuro.com/an3_Uploads/file/timesa.pdfIn PDF document text
    • http://www.kevimotor-rock.hu/files/files/vugawufuk.pdfIn PDF document text
    • https://www.la-melodie-des-saveurs.fr/ckfinder/userfiles/files/tokatupalalunaba.pdfIn PDF document text
    • http://chinamakina.com/userfiles/file/zuraradagi.pdfIn PDF document text
    • http://www.prctech-th.com/ckfinder/userfiles/files/witesiwotewesenifaz.pdfIn PDF document text
    • http://ibshop.gr/uploads/_uploads/files/nujezalivovotoj.pdfIn PDF document text
    • http://noavarservice.com/ckfinder/userfiles/files/kikuraludugojukis.pdfIn PDF document text
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/16134a91b2d84c---vomepumotalepufupixap.pdfIn PDF document text
    • http://sowa-architekci.pl/userfiles/files/93764981399.pdfIn PDF document text
    • https://sarna-zapiekanki.pl/ckfinder/userfiles/files/kufusup.pdfIn PDF document text
    • https://rtquery.reitoken.org/Coaching123/images/files/75365390859.pdfIn PDF document text
    • http://24horasnoar.com.br/ckfinder/userfiles/files/60605071592.pdfIn PDF document text
    • http://uniradioweb.info/userfiles/file/94288483698.pdfIn PDF document text
    • https://silverlabpupsforsale.com/userfiles/files/fovidaj.pdfIn PDF document text
    • http://kronikarp.pl/ckfinder/userfiles/files/43998266615.pdfIn PDF document text
    • http://dinobajka.pl/Upload/file/99539860177.pdfIn PDF document text
    • http://e68momo.com/shopadmin/upload/files/rapikexaligudapojaj.pdfIn PDF document text
    • http://vinhosnorte.com/images/files/wugenujivuzawarotagolol.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_off0000bce4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBCE4 11068 bytes
SHA-256: ecca5e5f989b5b36114462c1409f5afa4cb1ea1e7928b90f13a71463d8b0faf9
font_01_sfnt_off0000d648.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD648 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ee5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE5A 16332 bytes
SHA-256: e32a464f5ce83bc2a7fec819e838ca4012376fcb7afe617cf75ac78e3ede61b3

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