Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a86c2a12c9edbf8…

MALICIOUS

PDF

75.9 KB Created: 2021-03-03 10:09:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 15c75572d956fe08b18cbb3cd78d78da SHA-1: fc455b15b9be99289e1b43310005e52105b03d5c SHA-256: 3a86c2a12c9edbf8be477085cb119f16ffcb3a71e7928bc9ecb097174cdee0f2
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, with one specifically pointing to 'nipisod.ru' and another to a link farm hosted on disposable domains, suggesting a phishing or malware distribution scheme. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this by identifying a pattern of numerous links on disposable hosting, often used to obscure malicious destinations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://nipisod.ru/strik?utm_term=free+smart+goal+template+for+students PDF link annotation
    • http://datumileriz.22web.org/big_nate_book_level.pdfIn PDF document text
    • https://dijamolilum.weebly.com/uploads/1/3/5/3/135347404/joduratut.pdfIn PDF document text
    • http://xexajume.iblogger.org/python_nameerror_name_platform_is_not_defined.pdfIn PDF document text
    • http://rivuxini.66ghz.com/petuvamatofoluponu.pdfIn PDF document text
    • https://kovipokuvukos.weebly.com/uploads/1/3/4/4/134497495/2580094.pdfIn PDF document text
    • http://manovina.mypressonline.com/is_nyu_required_sat_for_2021.pdfIn PDF document text
    • https://gufakapefevem.weebly.com/uploads/1/3/5/9/135994046/pikisosajoxo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409627/normal_602afacaf1ad9.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xuvunemomot.epizy.com/63547367459.pdfIn PDF document text
    • http://segudufarus.epizy.com/email_campaign_strategy_template.pdfIn PDF document text
    • http://jexiduro.rf.gd/monthly_management_report_sample.pdfIn PDF document text
    • http://dumudolaba.epizy.com/65673872934.pdfIn PDF document text
    • http://vimitafukufes.rf.gd/instagram_videos_iphone_online.pdfIn PDF document text
    • http://fezajeb.epizy.com/72979255223.pdfIn PDF document text
    • http://wexejof.epizy.com/16955034719.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_off0000eb8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB8F 5316 bytes
SHA-256: cb9d74ecd5f2561ba20ede0f25fe5968f4584903117c8947d1b5bb57c73775fe
font_01_sfnt_off0000fd8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD8E 10368 bytes
SHA-256: 5d6c4500a5d871290df73d59e01fa5bb32387058043f7ea9472594f03be2d234

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