Malicious PDF — malware analysis report

Static analysis result for SHA-256 5bf30328eb125064…

MALICIOUS

PDF

68.6 KB Created: 2021-04-11 06:41:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: d516bb8ca5d4230b54b998d57be5039e SHA-1: 2907c668666135f36b44a65384cdf008713823b7 SHA-256: 5bf30328eb125064c76fdeaa8bea5ae22ff232893d49dba45617ce2cef2e05d3
126 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with one prominent URL identified as a potential phishing or malware distribution point. The ML classifier and ClamAV detection strongly indicate malicious intent. The document's content, though heavily obfuscated, appears to be a lure disguised as a study plan, aiming to trick users into visiting the malicious URL.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://jacksth.ru/strik?utm_term=plan+de+estudios+2011+secundaria+tecnolog%25C3%25ADa+administraci%25C3%25B3n+contable PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4528780/normal_6033f3c7a4ac5.pdfIn PDF document text
    • https://vinadesafabav.weebly.com/uploads/1/3/5/3/135305522/pasazapiwirubajajo.pdfIn PDF document text
    • http://wedudixunuluwef.iblogger.org/feladudipitatov.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459322/normal_5fdea638beac1.pdfIn PDF document text
    • http://lunagogafoxoj.sportsontheweb.net/bejusoxuvosi.pdfIn PDF document text
    • https://wepesinojaru.weebly.com/uploads/1/3/2/3/132303052/6a47a1.pdfIn PDF document text
    • http://bimojulumefa.iblogger.org/peugeot_103_spx_fiche_technique.pdfIn PDF document text
    • https://jagewimaw.weebly.com/uploads/1/3/4/0/134012974/wukife_bokuvobi_tidalivexopejak_dudakelut.pdfIn PDF document text
    • https://lupawepenotude.weebly.com/uploads/1/3/1/6/131606523/9944667.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376601/normal_605368743c024.pdfIn PDF document text
    • http://dilawiputonu.mypressonline.com/94062494918.pdfIn PDF document text
    • http://viwimewi.22web.org/55417205733.pdfIn PDF document text
    • http://sesumuruvo.22web.org/7240116340.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/veledabejufi/17272809866.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1b4e659c-d7cf-46c4-9fcb-00e2c9b3cb7b/22318674398.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4617f23c-65e3-42ac-ab8f-6f7bc46801f7/9461270397.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c6eec43c-bf2f-4e77-8e7e-29b3296c6787/the_100_book_and_tv_show_differences.pdfIn PDF document text
    • http://fobiwuna.epizy.com/pefixefojofukomibutifijez.pdfIn PDF document text
    • https://s3.amazonaws.com/loneminovu/tuwefaxusofox.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c324e8e3-63d1-41f5-8f37-97395a264b53/64243376042.pdfIn PDF document text
    • http://fotizojorirepel.onlinewebshop.net/35915969121.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/06ceb77a-9c7d-48f8-b928-e4d9b7c5a8cb/6171671739.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_off0000cb46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB46 5916 bytes
SHA-256: da2232251f5d6339523111d8fb92d725ab96e74c32b4c9881ee2017890d4be45
font_01_sfnt_off0000df0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF0E 10328 bytes
SHA-256: 7ef3f5148cd3710c81770c07891ab096858b7861ee7db4fd3d0b12824f14f69e