Malicious PDF — malware analysis report

Static analysis result for SHA-256 e5b86255496ad840…

MALICIOUS

PDF

71.0 KB Created: 2021-03-16 03:18:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-29
MD5: f0b5912629b12dfb72c241fb615408e7 SHA-1: eefddb0ce519639892745953ba55fb7c79cd2638 SHA-256: e5b86255496ad840b94caa59558395037e71681e384e9235365eb92c6e7bf54c
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of embedded URLs, many hosted on disposable domains, suggesting a link farm or redirection mechanism for malicious content. The document body, though heavily obfuscated, references "Nike size guide uk mens", likely a lure to attract users to click on the embedded links.

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://seumenha.ru/123?utm_term=nike+size+guide+uk+mens PDF link annotation
    • http://doctora.club/14973745018rus8i.pdfIn PDF document text
    • https://cdn.sqhk.co/tikalijit/U93fErJ/deck_wallet_for_clash_royale_arena_11.pdfIn PDF document text
    • http://asia.kiwi/lectura_y_bibliotecas_escolaresldp1x.pdfIn PDF document text
    • https://cdn.sqhk.co/bubiwalifeda/eahdZ7q/wejuzuwoxo.pdfIn PDF document text
    • http://byseles.xyz/ham_radio_license_canada_study_guideuwqm0.pdfIn PDF document text
    • http://dixajadabaw.66ghz.com/bulumodudowanerukinidibal.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bemeridalazobox.epizy.com/bounce_game_128x160.pdfIn PDF document text
    • https://e7ba4f66-d023-404d-a355-a5b98970f127.filesusr.com/ugd/cac9e4_d9a502a86f814f1dabfc3b5b82edada4.pdf?index=trueIn PDF document text
    • http://firiveperoju.epizy.com/47608561280.pdfIn PDF document text
    • http://zuzipidagazetu.rf.gd/net_framework_4._0_softonic.pdfIn PDF document text
    • http://merijimiz.epizy.com/bifobobejukelowixejuke.pdfIn PDF document text
    • https://2a085669-a8dc-40eb-b1d3-71ea9d660f60.filesusr.com/ugd/cafc24_cac8d411809d4581af07559fdce117a9.pdf?index=trueIn PDF document text
    • https://9c789f27-b70c-4c9d-9e83-211ee8f99b38.filesusr.com/ugd/bdeb4c_d99d121c4b074bfea361789119839c5f.pdf?index=trueIn PDF document text
    • http://midexudotag.epizy.com/jajimejip.pdfIn PDF document text
    • http://netojisabozop.rf.gd/xazog.pdfIn PDF document text
    • http://lizaduguxo.epizy.com/58728228033.pdfIn PDF document text
    • https://53860ffb-5975-4088-b838-5c82367c2827.filesusr.com/ugd/0d2908_cf567accd61d4592baebe51e2d1de139.pdf?index=trueIn PDF document text
    • https://5090c2af-253d-40c3-bfb7-942fc6db26b0.filesusr.com/ugd/0511f5_c92e17cc63e048359a98deea1e99c6a0.pdf?index=trueIn PDF document text
    • http://bepukugi.rf.gd/serial_killer_hollywood_movies.pdfIn PDF document text
    • http://tupibamogowoful.rf.gd/sword_art_online_alicization_light_novel.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000daab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAAB 4892 bytes
SHA-256: e347e40bbdae35daafce77e1d43349e8e92738c7823fb3dd3d0b1d389ee47f45
font_01_sfnt_off0000eb52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB52 11112 bytes
SHA-256: ed635b54334dd3fef413071bb4389ff7e521237a455bec84885ca9f793cbd36e

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