Malicious PDF — malware analysis report

Static analysis result for SHA-256 85b9a53094c008a0…

MALICIOUS

PDF

70.6 KB Created: 2021-04-28 10:23:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: c8d03c23959a1cc6c334b81ffc47a0d6 SHA-1: 4ed6b425f0aef935828611d5be25dd699b4d42a9 SHA-256: 85b9a53094c008a0986811a78444d04167ca13c1a8bb341b50a3d0b603098299
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many hosted on disposable domains, suggesting a link farm or phishing operation. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the PDF structure and embedded URIs point towards a social engineering attack designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://soxebez.ru/strik?utm_term=how+to+connect+ipod+nano+6th+generation+to+itunes PDF link annotation
    • http://jetodubiropev.iblogger.org/vukoxivenubuwoxiresupak.pdfIn PDF document text
    • https://sajoviginuxux.weebly.com/uploads/1/3/2/7/132712139/7323141.pdfIn PDF document text
    • https://surugatolezijef.weebly.com/uploads/1/3/4/6/134631687/11707377cfc54f0.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://dopapaxejoj.epizy.com/magazine_layout_sample.pdfIn PDF document text
    • https://434dcbc4-7bd9-40fe-99bf-e102daebf961.filesusr.com/ugd/07ef24_6bb9fdf8cb8645358a2018a714fe4351.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xulepiwa/android_development_tools_adalah.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dfe38129-6265-4a6a-8422-4dbec245cab4/lugezoletemosa.pdfIn PDF document text
    • https://05f6fcc2-a4c7-4d5b-b58c-97b640a93f4d.filesusr.com/ugd/74147a_265cf25cfc0347fd911b727378f6e10d.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/kefefetafij/78675618779.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a08a5238-7554-421b-b7a2-813d132f6d9a/hansel_vs_gretel_2015_cast.pdfIn PDF document text
    • http://vogonopodoje.epizy.com/kilel.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f836f9a0-8536-477a-9ca9-796943298fca/wulokijodozegovizepiwa.pdfIn PDF document text
    • https://d5fd0048-bb8d-45a1-ba21-28d1cb0b7162.filesusr.com/ugd/5e8de6_9514d345dd2f49cc80e186bc2d5ca599.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/7312a878-c56d-4fa2-979a-01af63ff04f6/supply_chain_management_undergraduate_salary.pdfIn PDF document text
    • https://s3.amazonaws.com/xeponodij/how_did_the_internal_combustion_engine_impact_society.pdfIn PDF document text
    • http://zopuraxikesu.epizy.com/54133229409.pdfIn PDF document text
    • https://04a80c79-134c-446e-801b-0c1635678e59.filesusr.com/ugd/5cebf8_ea3e7cab4c4f40eca74e87b4b2e661ae.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/40c78641-94f0-4e63-8a2f-3592246a4632/simevidafemobugivototenis.pdfIn PDF document text
    • https://6a9ecc2b-05c3-4056-8705-773ae6be8cdd.filesusr.com/ugd/7a359d_ece2775afb1a4d318c3e295c755cb2e1.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_off0000d6c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6C5 5512 bytes
SHA-256: 9eb2ba90ed9370375cca95e3e438ab9eaa651217379c0f4171df02f46adb3037
font_01_sfnt_off0000e98b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE98B 10404 bytes
SHA-256: 1452f2f475d07f17130afa37fb15425aba0cf0b0286e09362b8eb52715dbb32c