Malicious PDF — malware analysis report

Static analysis result for SHA-256 e7eb24d0261a1a26…

MALICIOUS

PDF

81.6 KB Created: 2021-02-19 19:20:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 7b1920b94fe2ca72a9e41fd9a6065ecd SHA-1: 4955034ac8f1a191f2841568a78768c376c3863b SHA-256: e7eb24d0261a1a2625790d5a92cb343db859ec9513d9d7a04a00d8aa7dd73da0
126 Risk Score

Malware Insights

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

This PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable hosting or link farms, suggesting an attempt to redirect users to malicious sites. The document body, though heavily obfuscated, appears to be a lure related to academic worksheets, which is a common tactic for phishing or malware distribution.

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://leonvi.ru/wix?keyword=limiting+reactant+and+percent+yield+worksheet+answers PDF link annotation
    • https://cdn.sqhk.co/kobadaxo/haT7idZ/revolut_business_account_bounce_back_loan.pdfIn PDF document text
    • https://ralanuda.weebly.com/uploads/1/3/0/7/130775203/rajurivekujibatojuv.pdfIn PDF document text
    • https://wofefewivesupas.weebly.com/uploads/1/3/5/9/135957376/watijaga-kofejotibakuje-rakijejisek-pelivedi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366395/normal_6003839aab104.pdfIn PDF document text
    • http://cosmicgig.com/korixowixugesiwatiparxvnc.pdfIn PDF document text
    • http://kopumiwabetare.66ghz.com/homebrew_guide_wii_u.pdfIn PDF document text
    • http://visiblawty.com/gizosikuk4nma5.pdfIn PDF document text
    • http://getliterate.online/68493931960k02n5.pdfIn PDF document text
    • https://vozidetuvotivex.weebly.com/uploads/1/3/6/0/136094215/6405687.pdfIn PDF document text
    • http://discount50.pro/211032000250q9t9.pdfIn PDF document text
    • https://norusukesalija.weebly.com/uploads/1/3/4/3/134356509/gugifaduwinivud-gokosusevazena.pdfIn PDF document text
    • http://zaneralisobiwi.22web.org/pisuzuwaxeporo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477386/normal_5fdb89db75871.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495271/normal_5fe607d126c2d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pibanifadedo.epizy.com/short_reading_comprehension_worksheets_5th_grade.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ea1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA1C 5684 bytes
SHA-256: 91a85702deea9c31c7b7cbc1d3cb3cbb5a5316e4e36625b123bd6f05bd975454
font_01_sfnt_off0000fd5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD5C 2456 bytes
SHA-256: 6bf6e25559807c0685103aa2f953a324b17ce84a813238c579e09354dba67056
font_02_sfnt_off000107f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107F4 14988 bytes
SHA-256: 9a35f5ada8db98e66045453e7941e2dbc92642e669de089b8dc524ad76e4c4e1

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