Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b99edab9ccc2c7c…

MALICIOUS

PDF

63.3 KB Created: 2020-11-14 17:23:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 46585c7d10dcca7e06dabb2a6b2aaeb9 SHA-1: d3310dfcd14918e9220712351c4b06ba401e0ecc SHA-256: 0b99edab9ccc2c7ca7b9812c5d466707edd54b04b6e87984801da64930ff99a0
154 Risk Score

Malware Insights

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

The PDF contains a significant number of embedded links, with at least two identified as potentially malicious or part of a link farm. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' indicates a direct link to known malicious infrastructure, while 'PDF_SEO_LINK_FARM' suggests a large number of outbound links, likely for SEO manipulation or to distribute further malicious content. The ML classifier strongly supports the malicious nature of the PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • 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.
  • 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://traffine.ru/strik?utm_term=socom+clinic+macdill+afb In PDF document text
    • https://boguvetasitob.weebly.com/uploads/1/3/1/3/131380850/towuf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426280/normal_5f9c0253c5ce3.pdfIn PDF document text
    • https://limikasideg.weebly.com/uploads/1/3/4/4/134446439/mugaduturalu-kakefadu-lazixawamul.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411682/normal_5f9380d7b9be3.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/669fbc13-0be8-4424-9182-239dc0d5ba78/miritivep.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/846d0267-b584-4a50-b555-030703250c22/niluredi.pdfIn PDF document text
    • https://s3.amazonaws.com/wopari/tesis_de_administracion_de_empresas_2017.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b99d3256-f00f-4d7a-a677-483b1c2f16a5/41909733303.pdfIn PDF document text
    • https://s3.amazonaws.com/vunizi/ziwumixuwadizixagujukeb.pdfIn PDF document text
    • https://s3.amazonaws.com/nagev/letterhead_sample_text.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8a218186-cc14-4c00-bd69-565a06b31d88/sixabikubopusinavavule.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/17df146a-7260-456b-a711-d9cdd6674729/la_puissance_de_votre_subconscient_gratuit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cf73823f-135b-4bc6-8531-417ccfbf7b85/giwukuduwazemumilibikul.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f90977da-0e30-40fc-b03a-cad88652d78b/39356217875.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b1ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1EF 4724 bytes
SHA-256: f4185f536aa10f0e0307ac5d9aaf1bb9940d31d56b492b96abf269bdcff55e61
font_01_sfnt_off0000c1cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1CC 9652 bytes
SHA-256: f6544067d5892d14028f72fbc71220e17d5a7fcaeda8d8faf93c701b65170de7
font_02_sfnt_off0000e245.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE245 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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