Malicious PDF — malware analysis report

Static analysis result for SHA-256 9caea55393258559…

MALICIOUS

PDF

74.8 KB Created: 2021-03-17 00:02:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: 57447f72d6beec2b938d43b30056bd97 SHA-1: 78c3d0b2585a35ecd5db4eb5922e2e37b730b788 SHA-256: 9caea55393258559e03973b5b5277c5f11721a52df58d9785eb658df3b881382
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with one specifically pointing to 'nipisod.ru', suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body, though heavily obfuscated, appears to be a lure related to a study guide, aligning with the 'link farm' heuristic which indicates a non-clustered link farm on disposable hosting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 5

  • 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 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/wix?keyword=pivot+point+cosmetology+fundamentals+study+guide+pdf PDF link annotation
    • https://zefojakafi.weebly.com/uploads/1/3/0/7/130776787/puburajiro-xowizax-vozazotiv-geximiveto.pdfIn PDF document text
    • https://cdn.sqhk.co/nuwalimo/es6ig8M/dades.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495694/normal_60233e1844283.pdfIn PDF document text
    • http://italystore.pro/78223544473innja.pdfIn PDF document text
    • http://wekeb.space/glory_to_god_mass_of_christ_the_savior_chordsklb2o.pdfIn PDF document text
    • https://cdn.sqhk.co/pisomuma/Jb2mDjh/49179136334.pdfIn PDF document text
    • https://gemitipob.weebly.com/uploads/1/3/4/4/134474898/linabojurebefe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410222/normal_604a3535ce230.pdfIn PDF document text
    • http://rollernefrit.xyz/the_art_of_seeing_aldous_huxley_audiobook4cv1d.pdfIn PDF document text
    • https://bixugukov.weebly.com/uploads/1/3/2/6/132680808/kaxopaliki_mananikiwide.pdfIn PDF document text
    • http://tryraisins.pro/99930470144yimok.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/xabalaru/luxusaxikikazezil.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eb786741-a943-4438-8cbb-1046165b31c4/pepepaf.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/203743ec-8709-4105-afba-fc2130504cd1/probability_and_statistics_for_engineering_and_the_sciences_7th_edition.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/85ec8a57-5551-473a-be56-77f5d1463052/rized.pdfIn PDF document text
    • https://s3.amazonaws.com/ditiruz/animal_phonics_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/fokapikow/appraisal_report_defined.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_off0000e22b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE22B 5540 bytes
SHA-256: d60021b1ed7f0cdf5b3bc7cd2ff2b67574b6115ef07b45e0007ba8310a32cbff
font_01_sfnt_off0000f506.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF506 12432 bytes
SHA-256: afdb2694d40858054e23ced15b89920672650a398ca3ea230b9f751921838c33

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