Malicious PDF — malware analysis report

Static analysis result for SHA-256 e56cd7b603c2a8a5…

MALICIOUS

PDF

74.5 KB Created: 2021-03-03 07:13:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: e3a80f976a781e93b4f0af6bcdcf616e SHA-1: 02fc0e20bffcffec126965888650c41deaa6e21f SHA-256: e56cd7b603c2a8a5bfdf92e7e71fee45924860a3242668d2cf3dca0b8c53684a
184 Risk Score

Malware Insights

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

This PDF file was identified as malicious by multiple heuristics and an ML classifier, indicating it is likely a phishing or redirection attempt. The embedded links, such as 'https://yafferge.ru/wix?keyword=probability+worksheet+3+compound+events', point to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, a tool often used to create malicious PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/wix?keyword=probability+worksheet+3+compound+events In PDF document text
    • https://cdn.sqhk.co/wadelovelo/ICjhhip/39078695365.pdfIn PDF document text
    • https://cdn.sqhk.co/gazamara/iWsuAiG/boomerang_web_series_cast.pdfIn PDF document text
    • https://cdn.sqhk.co/dejojoduzi/mwhdpMw/70802377199.pdfIn PDF document text
    • http://fufulizirexub.22web.org/38191315434.pdfIn PDF document text
    • http://sy0n.icu/53247939063wrfwt.pdfIn PDF document text
    • http://interbank.link/5614650601u5a2e.pdfIn PDF document text
    • https://cdn.sqhk.co/lopijikuvi/UCEjgRM/red_roses_lyrics.pdfIn PDF document text
    • https://cdn.sqhk.co/jisepozidis/i1zgfii/usa_today_sports_nfl_scores.pdfIn PDF document text
    • https://cdn.sqhk.co/dedogupazib/e6928ji/18898450361.pdfIn PDF document text
    • http://kernig.online/zemogotaguzigomonimakexaruc5v0.pdfIn PDF document text
    • https://cdn.sqhk.co/jemitaso/egeKmSf/science_lesson_plan_ideas_for_kindergarten.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fomobiwudaz.rf.gd/nisavutazupelalusidek.pdfIn PDF document text
    • http://toponetivipabar.rf.gd/90452732146.pdfIn PDF document text
    • http://zozadugaweguj.epizy.com/45922547987.pdfIn PDF document text
    • http://refewebol.epizy.com/amigos_para_siempre_nuty.pdfIn PDF document text
    • http://zewogukanonudut.epizy.com/what_not_to_ask_in_a_tarot_reading.pdfIn PDF document text
    • http://kuwubuvorij.rf.gd/xiaomi_amazfit_bip_firmware.pdfIn PDF document text
    • https://s3.amazonaws.com/lomuper/cheap_used_android_phones_for_sale.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_off0000e5bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5BD 5936 bytes
SHA-256: 583e25866db298a001078109d9598f60581e0719e3dbc90b82ecf4261a9c5806
font_01_sfnt_off0000f9db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9DB 10348 bytes
SHA-256: 09fba87d34a25030d87c619e9e0acbcd3e4cb46c5366fd8a688248cd74a8a0f9

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