Malicious PDF — malware analysis report

Static analysis result for SHA-256 52857e74989cdbd6…

MALICIOUS

PDF

78.7 KB Created: 2021-04-10 22:42:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: dd2609e01e9247633c48c07b162ba18d SHA-1: 9e7056fc01072946e238c73d6e3f56bba2eef4c2 SHA-256: 52857e74989cdbd60c27e1ed140fe74aa2be8a4e9f0f396ae9a21864dc4a032e
186 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 0.9996

Heuristics 6

  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://dugedepap.ru/strik?utm_term=michelle+beatles+piano+sheet+music+free PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4375896/normal_5feb0744977a3.pdfIn PDF document text
    • http://getakabawi.22web.org/59892524884.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485570/normal_605ae81b60c88.pdfIn PDF document text
    • http://ravitidi.22web.org/13723584354.pdfIn PDF document text
    • http://zejufixapoferu.iblogger.org/12916_shadow_run_blvd_riverview_fl.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367268/normal_5ff283b688402.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://a1c9bafd-2917-4c1b-b79c-a4b44a941470.filesusr.com/ugd/f0f215_6b03b33bcc1b4a07b57f27999e54a3a7.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/7665db50-a879-4a70-b706-d897c979f69d/mebenudejanivukitaloduw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d72d2d7c-9d99-4422-a04b-ad3f7d9bce5b/wabekerelut.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5e00ad21-3782-457d-8f93-1f5430536e45/kisinofejunu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a9e47534-e2da-4790-b47f-03153de17f3b/behringer_xenyx_x2222_manual.pdfIn PDF document text
    • https://b2691e05-be35-46d2-a26d-08c503de0475.filesusr.com/ugd/b15c0b_fcc6f63fdecd49e4b5fcd8719eb12f0e.pdf?index=trueIn PDF document text
    • http://zegolerugowo.rf.gd/zubakizeg.pdfIn PDF document text
    • http://rabilovobixito.epizy.com/five_sense_organs_worksheet.pdfIn PDF document text
    • https://6d4cd3b7-91e9-43ac-92b9-205473f1e50d.filesusr.com/ugd/28146e_0e2ee0b3ecd94c81bd1a5eeb05248c98.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/710029a9-1e4d-45ab-9388-1b5e06e72d1e/honeywell_6160_wiring_diagram.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/803ee11a-e268-40cd-a3cf-4fd1200ba2cd/31571699450.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6209e25d-2935-42b4-9be8-2a58468d3f8d/59767392363.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/baac1946-9042-4931-a83d-c200f9983cba/kekobosok.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7902bb96-4909-407e-a887-30b2d41b2585/giwofobogugimo.pdfIn PDF document text
    • https://71e5fc8e-cc9a-4633-96c3-2c70acd464d0.filesusr.com/ugd/f08e01_abc837ce64da401aa9486d3531101fbb.pdf?index=trueIn 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_off0000f637.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF637 5400 bytes
SHA-256: a3643bb7b1f8377731536b77ea11bdb04450c707b17988e3495bf549471ece1a
font_01_sfnt_off00010876.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10876 10816 bytes
SHA-256: 2fade607f917a2ed75fa85d350f7fe52fa46f5417d52ceee355f5571c61ec1ce