Malicious PDF — malware analysis report

Static analysis result for SHA-256 b0fde2971256e5a9…

MALICIOUS

PDF

82.1 KB Created: 2021-05-21 19:49:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 2532596149e83bb7fdd6651589f839fa SHA-1: d4856a5942df17a800d5854633ce5654fc6c06fa SHA-256: b0fde2971256e5a906b0ab563e9904dec67037670018f8b189a9703d94940fff
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which point to disposable hosting services, indicating a link farm designed for SEO manipulation or to distribute malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution via these links. Although no scripts were explicitly extracted, the PDF structure and link farm heuristics point towards an attempt to redirect users to harmful 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://gimoguvi.ru/strik?utm_term=como+fazer+uma+pequena+estufa+para+plantas PDF link annotation
    • https://juzowugaf.weebly.com/uploads/1/3/4/7/134773334/jokaz.pdfIn PDF document text
    • https://kivisazof.weebly.com/uploads/1/3/2/6/132696558/xewiruzeral_begokeserer_vabowi_faxevipoji.pdfIn PDF document text
    • https://nuvutujozexavu.weebly.com/uploads/1/3/4/1/134131277/7960059.pdfIn PDF document text
    • https://gunupilerupuva.weebly.com/uploads/1/3/1/8/131871796/c0c2f93fe2a4.pdfIn PDF document text
    • https://senetawipuguzez.weebly.com/uploads/1/3/5/3/135313667/5898661.pdfIn PDF document text
    • https://gopoxigubujazu.weebly.com/uploads/1/3/0/9/130969754/zetum.pdfIn PDF document text
    • https://marejipafikelor.weebly.com/uploads/1/3/1/4/131437604/xesire.pdfIn PDF document text
    • https://fejavuwuvumago.weebly.com/uploads/1/3/0/8/130874007/janotixajunus.pdfIn PDF document text
    • https://jetosiwer.weebly.com/uploads/1/3/4/7/134767378/3374f1c.pdfIn PDF document text
    • https://noxijinijomud.weebly.com/uploads/1/3/4/7/134746703/xuxubafir.pdfIn PDF document text
    • https://gozerezujokosas.weebly.com/uploads/1/3/4/8/134856803/1156303.pdfIn PDF document text
    • https://borirokuve.weebly.com/uploads/1/3/1/4/131437567/bajikonisa_guxego.pdfIn PDF document text
    • https://fikuvigobe.weebly.com/uploads/1/3/4/5/134582673/lokunokelaso.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/a246e1be-6be5-4fcd-ab8b-1ea2f79b68b8/medical_anthropology_a_biocultural_approach_4th_edition_ebook.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4ccea575-ec18-46f5-a5e7-ed2af3e82f77/nebakudiwutelawarubin.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e8462c95-3a4b-4239-96e5-49a4ad53e8cc/60497660355.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8ca0696b-688d-4aec-80ab-ffd6b06762ba/what_country_is_50_shades_of_grey_on_netflix.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/82daabaa-e453-4e21-bbad-9041dad1761a/88941694734.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5d6df749-292b-49c4-9781-a6b364e00958/spirit_of_python_bible_study.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_off0000f6ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6AC 5128 bytes
SHA-256: 249c7a6abad81058f2a2e5fbb8c63e69230078d2514ffa0552d043bf981b7ef5
font_01_sfnt_off00010808.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10808 1800 bytes
SHA-256: 51ebeec29509b87aa858d500e37ac8853184703d07d1f913ce36d8e1dc7764c0
font_02_sfnt_off00011096.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11096 13124 bytes
SHA-256: 7daebf2dd4f1cc4e21078f1df0428c9c00965148afb8a7bc064c640f3240eb59