Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa592db30de0a5fa…

MALICIOUS

PDF

67.8 KB Created: 2020-11-20 09:09:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: f2b0006100077d1d9c453815d31e8489 SHA-1: d6ddf5ee222c548585793a21c9a7fa19b61bb524 SHA-256: aa592db30de0a5facbacf4f2f608d4a3f89eb364c468efa6f90a5d4489bf9ca8
156 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://traffine.ru/123?utm_term=me+and+jesus PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4417997/normal_5f99dfe33570b.pdfIn PDF document text
    • https://zunesevofulopu.weebly.com/uploads/1/3/4/3/134385883/3545825.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/davolazupivowi/duran_south_africa.pdfIn PDF document text
    • https://s3.amazonaws.com/tizowodifi/argos_bedding_valance_sheets.pdfIn PDF document text
    • https://s3.amazonaws.com/radubozufiwo/lebelegiwome.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/baf63d1a-269b-4652-8052-0e89a405ca36/54384044710.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3fd1973b-ae29-4123-97a5-5eba06c96feb/moderna_vaccine_nih.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7a43d2e9-1df7-4775-bfc4-23b71f0bfe34/17391147456.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fd84a8fb-ab49-4850-a656-c5d3d6ad2a2f/turogoxikawelalujafiwa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/670741a0-87c5-4d27-9237-5682e513105e/31368200684.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_off0000ce0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE0C 4772 bytes
SHA-256: 886f7909876202a7a7307224b7ef7b4c9dcbfd094f77b97204df42f723e24eae
font_01_sfnt_off0000de68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE68 10836 bytes
SHA-256: c6bd477c3b924467dbd7aea8ab2e1322aeb6f4c9c77d952851b73e061550317e