Malicious PDF — malware analysis report

Static analysis result for SHA-256 cfe7a92cea01ac9a…

MALICIOUS

PDF

72.6 KB Created: 2020-12-30 04:13:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 8d2f81c8520bbe9a8fffd7b2db09aca1 SHA-1: fe40f1c2b04beb2ca192c3a782fd696d0c2be0a3 SHA-256: cfe7a92cea01ac9a96721a3f7ca5d70f39d36dbeb7d3d479cc2ad7ef5f0fe5bf
96 Risk Score

Malware Insights

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

The PDF file contains a significant number of external links, identified by the PDF_SEO_LINK_FARM heuristic, pointing to various websites. The ML classifier also strongly indicated maliciousness. While no scripts were directly extracted, the presence of numerous external links suggests an attempt to redirect users to potentially malicious sites, possibly for SEO spam or to host further stages of an attack. The document body is heavily obfuscated and unreadable.

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://traffine.ru/wb?keyword=ordinal%20statistics%20data PDF link annotation
    • https://fikepeti.weebly.com/uploads/1/3/4/4/134489659/bikasubanivu_godogo_vapevokej.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374699/normal_5fc494711cf92.pdfIn PDF document text
    • https://faturigazed.weebly.com/uploads/1/3/4/8/134859690/6849748.pdfIn PDF document text
    • https://menerixejujup.weebly.com/uploads/1/3/4/6/134605313/9030463.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375702/normal_5f8c10f52ca3f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470409/normal_5fdad0904235c.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/ad8846ab-68df-47e1-9479-dbe3ede42631/kuxamejukadelotonigizero.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/774151d2-06bb-42d1-9d69-4e6e7b267dea/dilugifuxadopofubegexi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0a8c5534-dc40-4532-a5e0-335fc3bcea42/5420405316.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3bfd95bc-f728-4152-8d1d-f3bd6eeeaba0/somopusixaweb.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c25a43ed-b354-4e15-b941-d0021696be1b/hacked_bank_account_and_routing_numb.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_off0000ddf7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDF7 4960 bytes
SHA-256: 6e74edc6e283fa1b0b439ebb49c09c542abc8af99e99ea54f83b780ece684779
font_01_sfnt_off0000eedd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEDD 11396 bytes
SHA-256: 71a8f8ac737525721b87e494f434953a840295ef4ccb62e7cebab17c9734247e