Malicious PDF — malware analysis report

Static analysis result for SHA-256 50dea92e4b40e0be…

MALICIOUS

PDF

74.2 KB Created: 2021-03-19 14:42:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 5bf6a5e865f395cf685e36c83ebb68c5 SHA-1: 6002c5e2992ed23829f5159403d1510b5fb67088 SHA-256: 50dea92e4b40e0be88d7aa01647b7f9832ea0810c8411b5794680ba39045f0e9
186 Risk Score

Malware Insights

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

The sample is a PDF file identified as malicious by ML classifiers and ClamAV. It contains a significant number of external links, many hosted on disposable domains, suggesting a link farm or redirection scheme. The presence of URLs like 'https://ponafet.ru/strik?utm_term=is+rainsoft+a+good+system' indicates a potential phishing or malware distribution attempt. No scripts were extracted, but the overall structure points to a malicious document designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://ponafet.ru/strik?utm_term=is+rainsoft+a+good+system PDF link annotation
    • http://morasuxod.getenjoyment.net/yaesu_ft_847_manual_espaol.pdfIn PDF document text
    • http://zosazufinur.mygamesonline.org/animal_alphabet_letters.pdfIn PDF document text
    • http://neridofufuleteg.scienceontheweb.net/30703196809.pdfIn PDF document text
    • http://lozipazom.sportsontheweb.net/94308083649.pdfIn PDF document text
    • https://pejivepomut.weebly.com/uploads/1/3/5/3/135339444/1bb483d3b950cf.pdfIn PDF document text
    • https://vonepegoparopew.weebly.com/uploads/1/3/4/3/134352316/9442560.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477137/normal_601dc2391374d.pdfIn PDF document text
    • https://subowenove.weebly.com/uploads/1/3/2/3/132303013/moteneb_rusevotobugivu_gerabe_duwebinubukuk.pdfIn PDF document text
    • http://jolixasij.sportsontheweb.net/a_haunted_house_virginia_woolf.pdfIn PDF document text
    • http://peromopativej.mypressonline.com/kabizeri.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426690/normal_6047b35ce7667.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/95ca30e0-b470-438d-88d1-e8c04b4495e2/frases_del_principito_hacia_la_rosa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/06bad474-bedf-455a-9c8c-d8e890524fb6/20120608857.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/52143086-e2ad-4a86-bd41-4de59e20aac2/cant_stop_wont_stop_foundation_nyx.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c09d67df-9478-4f17-9763-4314a7e6f934/27016495650.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4f4f899a-e148-4ee9-9fdc-fd307f7eea6b/kavelo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/283e1f15-3302-4e69-adfc-76cf7e633ebc/jubekasufesi.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_off0000e1d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1D8 5236 bytes
SHA-256: d32e8598fe6a48ffcf09a195cf1762cc3adfbe53bfecf2167d4a0d9ae3f00ebf
font_01_sfnt_off0000f39c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF39C 11496 bytes
SHA-256: c9fc36bd8bf3b74fefec2a1185f4894c8398d4e82252d031dfcc910d89e6e6b5