Malicious PDF — malware analysis report

Static analysis result for SHA-256 bae5b088b6832642…

MALICIOUS

PDF

69.4 KB Created: 2020-11-29 12:23:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 8c85cad481695a7c91532c66f84493b0 SHA-1: 92d8958f145ddb18eb2854f2e636b6d2a7d8555c SHA-256: bae5b088b6832642c23456ef8007c92aa060067d9215a951d1d726fa71438935
96 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by 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 0.9997

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://traffking.ru/strik?utm_term=tokyo+facts+for+kids PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4369173/normal_5f9b7b72f2a81.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459916/normal_5fc2ce2f1f9ca.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464313/normal_5fa665da8e642.pdfIn PDF document text
    • https://gujodoludota.weebly.com/uploads/1/3/2/6/132681740/ea9943d63476.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/0edd3e1f-5a6c-4b2a-a04e-195375ca0025/parajozaxodiwomiw.pdfIn PDF document text
    • https://s3.amazonaws.com/minegikukovel/accident_investigation_report_writing.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e342d403-2536-44d5-8faf-b958cd378e19/55120120582.pdfIn PDF document text
    • https://s3.amazonaws.com/jemazejodep/gujevizi.pdfIn PDF document text
    • https://s3.amazonaws.com/lixuduwonifa/19731531301.pdfIn PDF document text
    • https://s3.amazonaws.com/vojapu/21574008246.pdfIn PDF document text
    • https://s3.amazonaws.com/tonemakopinibem/korelujesebikopego.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_off0000c568.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC568 3528 bytes
SHA-256: 3a3b7dc37f47b5adc99d7aab3abe8b57173d39add40e3298c9051f52452e18a9
font_01_sfnt_off0000d1e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1E7 5100 bytes
SHA-256: 9a7147b4058aaec853d0c63d6be31c099628575c174e10df4c400f8bdaa3f187
font_02_sfnt_off0000e35f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE35F 10824 bytes
SHA-256: 84bd79668e7a8e8f7161b784357f6cc4648e48b4f1f242e07b31a7cd3be21c49