Malicious PDF — malware analysis report

Static analysis result for SHA-256 951ae64d3f2f3cd3…

MALICIOUS

PDF

81.3 KB Created: 2021-03-05 12:35:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: 40f89b6aaf42e3cc8d2539f9158d8992 SHA-1: 7a166dca40dd75fd45179553af6e51a26149be01 SHA-256: 951ae64d3f2f3cd30ad8c4500ed8562b5cb8a6dac0c54a2c5f5cf9981b57f635
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous external URLs pointing to various PDF documents hosted on disposable domains. The primary purpose appears to be directing users to potentially malicious content or phishing sites, leveraging the PDF format to obscure the true nature of the links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://maypoin.ru/strik?utm_term=is+ozone+a+good+mountain+bike PDF link annotation
    • https://posijakafit.weebly.com/uploads/1/3/5/3/135320461/802af1dd003b8ec.pdfIn PDF document text
    • https://cdn.sqhk.co/sesumaku/qaK4Vgj/atari_2600_emulator_mac.pdfIn PDF document text
    • https://cdn.sqhk.co/nugopanage/hhjbgcY/50039356180.pdfIn PDF document text
    • http://vazawujuzu.sportsontheweb.net/honda_eu2000i_carburetor_bowl_gasket.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445550/normal_600be2e44f4dd.pdfIn PDF document text
    • https://cdn.sqhk.co/budajawisore/xgiPGVJ/2553071323.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4479213/normal_6006643117869.pdfIn PDF document text
    • http://dotixomovi.sportsontheweb.net/death_note_ryuk_voice_actor_english.pdfIn PDF document text
    • https://wewofubajibopa.weebly.com/uploads/1/3/1/3/131381003/7930893.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://4ac36a2f-1533-488b-b282-cf34cdace458.filesusr.com/ugd/bcfc12_a7ddab3de39d4ba4887eb8dc39d2ff09.pdf?index=trueIn PDF document text
    • https://f7690f66-1871-4559-97e0-239dee5b15da.filesusr.com/ugd/d2cc1f_508adda6d773496ebfa59bfd09d546df.pdf?index=trueIn PDF document text
    • http://pofebevasusin.rf.gd/sinamobuvituw.pdfIn PDF document text
    • http://voferinokubusob.rf.gd/nabekisudavinikifufosog.pdfIn PDF document text
    • http://dopovis.myartsonline.com/44794268945.pdfIn PDF document text
    • http://xupudajiwozov.epizy.com/5379857824.pdfIn PDF document text
    • https://8641c524-1fb5-4292-87ed-dd72f64d6c22.filesusr.com/ugd/9b7d8a_435bb5dc227941c1b29379e4b949b467.pdf?index=trueIn PDF document text
    • https://1c985592-4fe2-425a-b8d2-7dc24782370c.filesusr.com/ugd/a13bc2_57557f9a72024326ac728090b2ca4e04.pdf?index=trueIn PDF document text
    • https://b01cffea-7a05-49e8-9781-04202a21c04b.filesusr.com/ugd/d5d855_8447fa2f4756415eadd30e5b11b6e1c0.pdf?index=trueIn PDF document text
    • http://vomalowo.epizy.com/92809841936.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_off00010255.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10255 5208 bytes
SHA-256: f31aaf487a6a6a2cb7993251d3837b24c5c84677690564d13f7c8ca41fd4499d
font_01_sfnt_off00011405.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11405 10684 bytes
SHA-256: 288553f7c0eb91cce2a3985e1f0b262a28c5e5d6b2689884f75c529adc2f26fa

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