Malicious PDF — malware analysis report

Static analysis result for SHA-256 e6b41b6a1ef996a8…

MALICIOUS

PDF

72.1 KB Created: 2021-02-19 04:43:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: e33f33fb186defc65c3c85c5a6ca6e32 SHA-1: 3bfcd626c3a6c476613073675571f8b75e884d3b SHA-256: e6b41b6a1ef996a899627c4bfd7a8bc4c737b1fac4ea407e5e43928735c3135c
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable hosting and link farms, indicating a malicious intent to redirect users. The ML classifier and ClamAV detection strongly suggest this is a malicious PDF, likely used for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a malicious document.

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://crophysi.ru/123?utm_term=compound+interest+gcse+questions+pdf PDF link annotation
    • https://bakijowo.weebly.com/uploads/1/3/4/7/134726649/xorifijotekinew.pdfIn PDF document text
    • https://cdn.sqhk.co/lekusovu/Dodgfig/97210236658.pdfIn PDF document text
    • http://timurberg.ru/adobe_captivate_8_free5qv3h.pdfIn PDF document text
    • https://cdn.sqhk.co/xexanodu/ijgg3he/64264864266.pdfIn PDF document text
    • https://vekaforu.weebly.com/uploads/1/3/4/7/134747957/datagef-luvutifizevo-raviwaxedomin-sivovuvaxuxaz.pdfIn PDF document text
    • https://cdn.sqhk.co/jixuvepabu/rrThcdM/69108625493.pdfIn PDF document text
    • https://babinekisifuve.weebly.com/uploads/1/3/2/6/132696104/8829032.pdfIn PDF document text
    • https://mulodetudujidof.weebly.com/uploads/1/3/5/3/135325190/mebarapoximeke.pdfIn PDF document text
    • http://hotelhouze.ru/alarmy_android_apphotjr.pdfIn PDF document text
    • https://cdn.sqhk.co/jupozaregu/gejdzjx/xufuwikura.pdfIn PDF document text
    • http://zoxifowivo.iblogger.org/free_chronological_bible_study_guide.pdfIn PDF document text
    • https://fejamelaluboj.weebly.com/uploads/1/3/4/3/134311679/xefaburulufurol.pdfIn PDF document text
    • http://espacecmb.xyz/109686416397ca9h.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://widuxetikos.epizy.com/jira_task_assignee_reporter.pdfIn PDF document text
    • https://s3.amazonaws.com/lokijuronig/92285050187.pdfIn PDF document text
    • http://felawikemuda.epizy.com/logo_quiz_level_3_answers_by_bubble.pdfIn PDF document text
    • https://s3.amazonaws.com/minabiwa/nukefaxo.pdfIn PDF document text
    • http://furexuzajob.epizy.com/tezoludixaj.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_off0000dab1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAB1 5264 bytes
SHA-256: 37eba44cc3a15b93d566023020070848c2286d817c6875793a5f969f0e7bba02
font_01_sfnt_off0000ec80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC80 11392 bytes
SHA-256: 257741e1804ab1d27f8204e4e80b15b557323caab2b0e4c56dfeccbeb4b2cde6

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