Malicious PDF — malware analysis report

Static analysis result for SHA-256 1808e174fa635434…

MALICIOUS

PDF

85.9 KB Created: 2020-11-14 02:02:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 41eceded3de4aae1e44a192afcafe366 SHA-1: efdcc6e4f2ad4fc1942c566f90467077ff060452 SHA-256: 1808e174fa635434b949aa05420a19a2a1bb8007e45881fc3a7bf75f15acd86f
96 Risk Score

Malware Insights

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

The PDF contains a high number of external links, many pointing to Weebly-hosted PDFs, indicating a link farm. The ML classifier strongly flagged this PDF as malicious. While no scripts were explicitly extracted, the PDF_URI and PDF_SEO_LINK_FARM heuristics suggest the document's primary purpose is to redirect users to a network of other documents, potentially for malicious purposes such as phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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/aws?utm_term=count+worksheets+in+a+workbook+vba PDF link annotation
    • https://japewilipo.weebly.com/uploads/1/3/4/4/134471591/965e94f92a40ee.pdfIn PDF document text
    • https://xojerajap.weebly.com/uploads/1/3/1/3/131384359/xekena.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409630/normal_5f976c4310ef3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366668/normal_5f88ca3fe0968.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/9f5b3315-a641-4689-854e-b934038ad924/fps_creator_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/tetazino/97868414815.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0d470627-aec8-48a0-a72b-0b2198a96590/karen_gillan_bald.pdfIn PDF document text
    • https://s3.amazonaws.com/sitok/kusadokijefunitedaxinozur.pdfIn PDF document text
    • https://s3.amazonaws.com/zuxadol/bonijiwajago.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e58796e0-c7bf-4cba-9dff-95f1b90316ae/32106523822.pdfIn PDF document text
    • https://s3.amazonaws.com/ninazarila/62730165609.pdfIn PDF document text
    • https://s3.amazonaws.com/fukepez/demand_worksheet_part_2.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_off0001154b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1154B 5000 bytes
SHA-256: 77bf37eff3c6d138ed972cf1203a988423bd8699a6c77d07454a631c7c799769
font_01_sfnt_off0001265d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1265D 10800 bytes
SHA-256: f101eb1a6ee752cd138174a52b4c933ecd1ea19ef9b01dd7e6bcf81977ff0214