Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9b83bea7d197673…

MALICIOUS

PDF

74.2 KB Created: 2020-11-23 08:03:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 0f224f41a662a1647b920d681ccf42f1 SHA-1: 9e6a869af7bd1beb2a069d0b193877e973d72ef7 SHA-256: c9b83bea7d197673860393276de073b8b28601014d3d66c95177c3279be3118d
254 Risk Score

Malware Insights

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

The PDF contains multiple heuristics indicating malicious redirector links and a link farm, specifically pointing to 'ggtraff.ru' and 'weebly.com' domains. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded links are designed to redirect users to potentially harmful content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://ggtraff.ru/123?utm_term=latin+for+home+is+where+the+heart+is In PDF document text
    • https://xifobosakup.weebly.com/uploads/1/3/2/8/132815359/427e8.pdfIn PDF document text
    • https://kosemarenile.weebly.com/uploads/1/3/4/3/134315061/viseranuvef.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389582/normal_5f8eee834b1bb.pdfIn PDF document text
    • https://dojifidixiwaji.weebly.com/uploads/1/3/4/3/134372722/gulamuke-feninidosiwevu-bipizov.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/fikuvine/pdf_editor_free_download_blogspot.pdfIn PDF document text
    • https://s3.amazonaws.com/datarofapakil/zorogipudewunajapitol.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0841a38b-a987-4686-95ca-645aa495d3c7/27826725928.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/81258964-0e9f-4ce4-b215-c3a725f4c776/xojumuvupafijapateriniduv.pdfIn PDF document text
    • https://s3.amazonaws.com/banula/cde_music_standards.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/918e96e5-4096-4abc-8eff-5b5d0da01758/como_descargar_la_pelicula_de_coco.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/81925abb-bad8-4fad-8667-f4eb91e002b4/aqui_estoy_hillsong_acordes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7f2dcc94-ef1c-42c5-812b-4ff33c1a46d4/autocad_2020_crack_x-force.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/37b74996-f0f4-476f-a0a0-aba3c5093637/musiguwusapibotafupe.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://scripts.sil.org/OFLIn 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_off0000cc43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC43 5008 bytes
SHA-256: db2a1928dd35d1bbf646f5e19d6db165cec631a29049f2f8b7ba46ac2d0e8981
font_01_sfnt_off0000dd38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD38 10408 bytes
SHA-256: ce496208213b6b0e2517ad53ae6d88288ce833e7ff69e89c3a7d8b6332223cd4
font_02_sfnt_off00010058.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10058 17888 bytes
SHA-256: 5a44f5be8cc3fa674ca268fc4a87755c94ab90aca8cdc3b49b0c7336e374cac4