Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ae25b9b5b45630e…

MALICIOUS

PDF

47.0 KB Created: 2020-11-08 06:44:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: f91bd182461e1d8da7fc54e2eb55cd04 SHA-1: 1ee60e905e711e3fb10d8858765dac1f8d904901 SHA-256: 5ae25b9b5b45630e97349661c657b97530fb676b625b8ff7a32bd300baa73006
96 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many of which are to WordPress and AWS S3 hosted PDFs, suggesting a link farm or SEO manipulation tactic. One prominent URL, 'https://trafficel.ru/123?keyword=apk+fb+for+pc', is presented in a way that mimics a search result, likely to trick users into downloading software. The ML classifier strongly flagged this PDF as malicious, supporting the suspicious nature of the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • 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://trafficel.ru/123?keyword=apk+fb+for+pc PDF link annotation
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://dimatafol.files.wordpress.com/2020/11/sims_4_neko_mod.pdfIn PDF document text
    • https://bifudavoz.files.wordpress.com/2020/11/xakanuderopuwotip.pdfIn PDF document text
    • https://xelinatuki.files.wordpress.com/2020/11/12873235441.pdfIn PDF document text
    • https://mutozofe.files.wordpress.com/2020/11/65548376527.pdfIn PDF document text
    • https://lodoxepal.files.wordpress.com/2020/11/reremuradivuvevedivogobid.pdfIn PDF document text
    • https://s3.amazonaws.com/wexukufedepim/11575110306.pdfIn PDF document text
    • https://s3.amazonaws.com/nokiva/16742833333.pdfIn PDF document text
    • https://nosixaxuk.files.wordpress.com/2020/11/six_days_of_the_condor.pdfIn PDF document text
    • https://s3.amazonaws.com/tuzakifezara/rokalekabafunadegu.pdfIn PDF document text
    • https://jatanoteje.files.wordpress.com/2020/11/la_culture_du_pauvre.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/713ae217-e2e1-48ee-8f77-41f77f658928/65881665369.pdfIn PDF document text
    • https://xeruluzolu.files.wordpress.com/2020/11/gunanegezitujugalevodero.pdfIn PDF document text
    • https://s3.amazonaws.com/fekaduvopigab/genijajexixuliwasatawub.pdfIn PDF document text
    • https://s3.amazonaws.com/zewimu/days_of_the_week_worksheet_for_kindergarten.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_off0000796e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x796E 4784 bytes
SHA-256: 71d91d7025bbf9c49cf2cd1d0fd74e28ab7688f624fd3c98038a962acc804e74
font_01_sfnt_off000089cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x89CD 10936 bytes
SHA-256: 3d51fe96249a9faa9851c11251ff8683c52e5606e145d90b061410a88c9de00f

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