Malicious PDF — malware analysis report

Static analysis result for SHA-256 f90278137a4ece24…

MALICIOUS

PDF

76.1 KB Created: 2021-02-28 07:38:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-04
MD5: f7bea6a0e6b629e05a010df3aded0d59 SHA-1: 8d72e1a9a05ce4c0142a42b6103ac0d224a57522 SHA-256: f90278137a4ece248e2cce85e4ca2d425acf49f27aaba0dc117619461d19fdd6
126 Risk Score

Malware Insights

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

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external links, many pointing to disposable hosting, suggesting a link farm or SEO manipulation tactic. While no scripts were explicitly extracted, the PDF structure and external links indicate a malicious intent, likely to redirect users to phishing or malware-hosting sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://maypoin.ru/wb?keyword=the%20mortal%20instruments%20tv%20series%20cancelled PDF link annotation
    • http://logoped-samara.ru/pse_tuning_charttjwql.pdfIn PDF document text
    • http://scrlt.xyz/gba_roms_android_pokemon_hackqkos8.pdfIn PDF document text
    • http://sallles.ru/393362209496jbm4.pdfIn PDF document text
    • http://max-lifting.store/bazigar_novel_downloadjqnh5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459188/normal_5fedd4f3b7746.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373239/normal_6029b6673b5e0.pdfIn PDF document text
    • https://vuwakoge.weebly.com/uploads/1/3/4/3/134368269/gudozipi_rumebuzanopane_pomijufid.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4427274/normal_5fdf5fd6a32e8.pdfIn PDF document text
    • http://kunujunekedi.mygamesonline.org/frases_de_paulo_coelho_el_alquimista_el_universo_conspira.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/jodabiladezot/bahubali_2_tamil_full_movie_cinemavilla.pdfIn PDF document text
    • https://s3.amazonaws.com/dutuzanob/free_adobe_indesign_annual_report_template.pdfIn PDF document text
    • https://s3.amazonaws.com/tapelu/farther_along_josh_garrels_sheet_music.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_off0000ee83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE83 5188 bytes
SHA-256: 2e8c503d7c2df007003282d92d87ac7852d7397ae9f86bbd3a6d974ff4df567c
font_01_sfnt_off0000fffa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFFA 10468 bytes
SHA-256: d27def50046cd94c3f028463b89fd9f9c8365a0f83b210c2b33d44fb795de050

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