Malicious PDF — malware analysis report

Static analysis result for SHA-256 ded017f55d99c3f2…

MALICIOUS

PDF

70.0 KB Created: 2021-01-18 06:47:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 53b439217c710bfdf01efd21909d6817 SHA-1: a49a4c27e7aab4726bc6688ef2b44325371bf29d SHA-256: ded017f55d99c3f2b49de13b871ce3b5464f69b4ce62da7dc9fb8966ab8d27ea
244 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

This PDF file was flagged by multiple critical heuristics as malicious, including a link to known malicious redirector infrastructure and a large link farm hosted on disposable domains. The ML classifier also strongly indicated maliciousness. The document's primary function appears to be distributing links to other PDFs, likely as part of an SEO spam campaign or to lead users to further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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.
  • 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://gettraff.ru/wb?keyword=best%20movies%202018-%2020 In PDF document text
    • https://nenizuve.weebly.com/uploads/1/3/4/6/134615173/gowuxed.pdfIn PDF document text
    • https://siregudak.weebly.com/uploads/1/3/0/7/130738759/eef2c8539.pdfIn PDF document text
    • https://site-1178602.mozfiles.com/files/1178602/cardiac_contractility_modulation_esc_guidelines.pdfIn PDF document text
    • https://site-1179443.mozfiles.com/files/1179443/zomusogid.pdfIn PDF document text
    • https://xosofanukofupa.weebly.com/uploads/1/3/4/8/134879033/lezizu-siwekeb.pdfIn PDF document text
    • https://site-1196465.mozfiles.com/files/1196465/manualidades_de_papel_para_nios.pdfIn PDF document text
    • https://rosuxemu.weebly.com/uploads/1/3/0/7/130776582/luxuvuditowi.pdfIn PDF document text
    • https://site-1168098.mozfiles.com/files/1168098/best_light_meter_app_for_iphone_5s.pdfIn PDF document text
    • https://site-1253965.mozfiles.com/files/1253965/39435917925.pdfIn PDF document text
    • https://vumimexuderuwaz.weebly.com/uploads/1/3/1/8/131871863/9660812.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/kabisebax/98112522097.pdfIn PDF document text
    • https://s3.amazonaws.com/resixexi/dopaw.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d534.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD534 5156 bytes
SHA-256: f66c3a568bde492a4c72f8e7d329773f37365e60481bcbdc361143804d38b40d
font_01_sfnt_off0000e6c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6C7 10696 bytes
SHA-256: 98b675ed962f152ca13a804f47cd639f26736eaec103820bf0a5cd6e654612fe

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