Malicious PDF — malware analysis report

Static analysis result for SHA-256 e309089a723fdcef…

MALICIOUS

PDF

77.2 KB Created: 2021-05-17 03:50:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: 545e5563b713b2747c7f96a0aff45484 SHA-1: 956cb9c0f4b11edd97bbdec91e740b40ffbef72e SHA-256: e309089a723fdcef34dc1c6e9c24925675de2897454305f033fc37a45001e7fe
126 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, with one specifically pointing to 'xajibur.ru/strik' which is presented as a free download for a PHP website project. This suggests a phishing or social engineering attack aimed at tricking users into downloading further malicious content. No scripts were extracted, but the presence of multiple external links and the overall heuristic analysis strongly suggest a malicious document.

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://xajibur.ru/strik?utm_term=php+website+project+free+download PDF link annotation
    • http://jifixadilo.22web.org/vixotal.pdfIn PDF document text
    • https://cdn.sqhk.co/nokotadi/lhaxEPD/19850964299.pdfIn PDF document text
    • http://vobalemujumojak.mywebcommunity.org/the_cambridge_introduction_to_anglo_saxon_literature.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374963/normal_5fc87b8ef3604.pdfIn PDF document text
    • https://cdn.sqhk.co/rivotoxupow/eZhbCFn/battle_heroes_merge_idle_tycoon.pdfIn PDF document text
    • https://cdn.sqhk.co/kujotukil/cNIAzyV/womesim.pdfIn PDF document text
    • http://sevezor.scienceontheweb.net/social_media_marketing_books_2020.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390056/normal_6056b9955225b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375896/normal_602083f0ec20a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://dudulumunir.epizy.com/javifenurifibatibiveg.pdfIn PDF document text
    • https://s3.amazonaws.com/zafijukopa/sumuroritofivulatid.pdfIn PDF document text
    • https://s3.amazonaws.com/waduzirader/wevafafeluzixa.pdfIn PDF document text
    • https://s3.amazonaws.com/lolijexejomak/best_python_data_analysis_book.pdfIn PDF document text
    • http://risepaxazitomep.rf.gd/50743943012.pdfIn PDF document text
    • http://wajodojizofe.epizy.com/kate_bornstein_gender_outlaw.pdfIn PDF document text
    • http://jemejux.epizy.com/fofiteweposenimusewaliz.pdfIn PDF document text
    • http://fegumipidibig.rf.gd/36321715714.pdfIn PDF document text
    • http://zetesapoxus.epizy.com/all_chemistry_formulas_class_12.pdfIn PDF document text
    • http://releboxodaw.rf.gd/75948794844.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_off0000f076.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF076 5552 bytes
SHA-256: 2cb121c95dfd3fa2361598b146191670241ef7bf8450683f293cb2b8deed4d6b
font_01_sfnt_off0001035d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1035D 10704 bytes
SHA-256: e043b2e2f0eb5e2bbe9a20790d4a8b8b0cc2f8c7dcc823d21c354f71a2859a15

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