Malicious PDF — malware analysis report

Static analysis result for SHA-256 90b53932c9791e3b…

MALICIOUS

PDF

94.8 KB Created: 2021-03-23 19:42:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: c3eb74f1f27262ca1e83d27c1f38757d SHA-1: a845516dcf927b7249906dd10303234f67e70d40 SHA-256: 90b53932c9791e3be7ecd897e75eabe9ea335c33b6cb5fd7e0a61aa4472920ee
126 Risk Score

Malware Insights

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

The sample is a PDF file flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, with at least two pointing to suspicious domains that appear to be part of a link farm designed to redirect users. The document body, though heavily obfuscated, suggests a lure related to performance appraisal reports, aligning with phishing tactics.

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://pelibifir.ru/award?keyword=effectiveness+of+performance+appraisal+project+report+pdf PDF link annotation
    • http://ninomut.sportsontheweb.net/jujumujigagevapin.pdfIn PDF document text
    • http://nakekizedexu.getenjoyment.net/dezuwapijuzena.pdfIn PDF document text
    • https://cdn.sqhk.co/wuwexosul/fjhgfhj/prison_break_the_final_break_movie_free.pdfIn PDF document text
    • http://hh666o.site/vigifituzikazugewuxumuxemd6dij.pdfIn PDF document text
    • http://sodaapp.club/concrete_slab_on_grade_design_spreadsheet9zz6h.pdfIn PDF document text
    • https://cdn.sqhk.co/ninafoso/jRtnMif/bunojutigugoteviz.pdfIn PDF document text
    • https://cdn.sqhk.co/goronikel/Jzce0hj/jerezisotofedoroj.pdfIn PDF document text
    • https://cdn.sqhk.co/gejupajo/mgfiegd/xelujopaxulegenaxibala.pdfIn PDF document text
    • https://cdn.sqhk.co/fedelubu/nhj3hgu/r34_gtr_z_tune_nurburgring_time.pdfIn PDF document text
    • http://vukosodo.iblogger.org/arpa_liguria_previsioni_meteo.pdfIn PDF document text
    • http://luwinilulurop.mywebcommunity.org/changing_my_name_after_marriage_checklist.pdfIn PDF document text
    • https://cdn.sqhk.co/gobuwovuv/bdkhgih/88863190971.pdfIn PDF document text
    • http://ecoterritory.store/repair_authorization_form_templatefkg7p.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://motuvogipe.onlinewebshop.net/judalame.pdfIn PDF document text
    • http://zabidogadifosis.rf.gd/99382805176.pdfIn PDF document text
    • https://s3.amazonaws.com/sifawekujiki/microsoft_excel_shortcuts_on_mac.pdfIn PDF document text
    • http://savefativiluz.epizy.com/choose_the_answer_from_the_box.pdfIn PDF document text
    • https://s3.amazonaws.com/vipinib/49439971714.pdfIn PDF document text
    • https://s3.amazonaws.com/vovopafubipu/96215289831.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011317.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11317 5180 bytes
SHA-256: a97f08afeadabe63c9b47df455ec97561c0e6d0101ec5d1aa7a10a28514a8de0
font_01_sfnt_off000124a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124A0 10848 bytes
SHA-256: 884af3c6980141078ab0c627e7ad846c243d6083054441b61c34508f65a39e94
font_02_sfnt_off000149fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x149FE 16204 bytes
SHA-256: e93acd332f5893643511f4cefd38969ad5c744ad1b08842a788b6be7d277dd15
font_03_sfnt_off00015f2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15F2C 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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