Malicious PDF — malware analysis report

Static analysis result for SHA-256 f0369a7461fd5457…

MALICIOUS

PDF

85.6 KB Created: 2021-09-15 23:29:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 51e053bf4389416f0c3643550bfbb494 SHA-1: 844429eae2b7a1054e70b518c63ba5bd1d6ab884 SHA-256: f0369a7461fd54573c50f01930510eebbb8453d60fb62f753b47c57351c387fe
126 Risk Score

Malware Insights

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

The PDF document was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic and the large number of embedded URLs suggest a link farm designed to redirect users to potentially malicious sites. While no scripts were directly extracted, the nature of the embedded links and the overall detection strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://barcelonacentremedic.cat/files/galeria/files/80478593610.pdf In PDF document text
    • https://gogift-it.com/userfiles/files/93521884065.pdfIn PDF document text
    • https://tepihtrava.rs/files/gokanedubufekuju.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161368ef9cff5e---37673511617.pdfIn PDF document text
    • http://fotosvatba.net/userfiles/file/mugixozajegitarixi.pdfIn PDF document text
    • http://chipgene.com/image/files/20210906_064829.pdfIn PDF document text
    • http://cssh.es/img/file/77446226667.pdfIn PDF document text
    • https://repetitorebi.ge/userfiles/files/xafaziviwipozexoterum.pdfIn PDF document text
    • http://cukorbetegshop.hu/files/xirojiburazamara.pdfIn PDF document text
    • http://studiocommercialedelpiano.it/userfiles/files/74723945227.pdfIn PDF document text
    • http://usarsenal.it/userfiles/files/46217011361.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138fdec8449d---88162085767.pdfIn PDF document text
    • http://thaiboxes.com/piceditor/file/97093745654.pdfIn PDF document text
    • https://dehaventransportation.com/home/de/public_html/ckfinder/userfiles/files/jelagowewuxonaferofof.pdfIn PDF document text
    • http://benetworkingpro.com/ckfinder/userfiles/files/fatelowalisinepa.pdfIn PDF document text
    • http://phuvuongcorp.com/luutru/files/74285057359.pdfIn PDF document text
    • https://arnetbilgisayar.com/upload/ckfinder/files/10370076036.pdfIn PDF document text
    • https://ciar.vn/uploads/image/files/sunekafefixusare.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=android+wekker+als+telefoon+uit+staatPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d4c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4C7 10604 bytes
SHA-256: 89ec38417016dbc9aa5b6706a3965641eaf12344f364cc060c942a1407726400
font_01_sfnt_off0000ed35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED35 17692 bytes
SHA-256: 205dda5d91c144004c4efa06714b8bc6b7f1b3df1900799713a1754c4e321af7
font_02_sfnt_off00011a9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A9D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off000132ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132AE 16312 bytes
SHA-256: 7d15b2d6d265aaca51dda18faee70a1b8fa9d95ed54cb111fb0895789092f9ae

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