Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8918c14ab0922bb…

MALICIOUS

PDF

93.3 KB Created: 2021-02-19 07:44:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: b40c659a4c8879d21f738e296d252beb SHA-1: b759c5b9167a19b2a145e44a67089c4961a3dfce SHA-256: a8918c14ab0922bb3a41346fae20183c3a9b321bab1198d603846936a5f79cc3
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which are hosted on disposable domains and flagged as link farms, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body, though heavily obfuscated, appears to be a lure related to educational materials, likely to trick users into clicking the malicious links.

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/aws?utm_term=english+comprehension+passages+with+questions+and+answers+pdf+for+grade+9 PDF link annotation
    • http://vemasujananexu.22web.org/30577736962.pdfIn PDF document text
    • http://geniusenglish.space/418418921396wxja.pdfIn PDF document text
    • http://good-production17.site/malibu_transformer_timer_not_working4b10j.pdfIn PDF document text
    • https://cdn.sqhk.co/zejizoguzut/hhLvt4V/sakiratifos.pdfIn PDF document text
    • https://cdn.sqhk.co/vibisimak/dXgjhew/download_ringtone_samsung_galaxy_s7.pdfIn PDF document text
    • https://cdn.sqhk.co/jabosuve/JieSgjt/msp_survival_guide_for_programme_managers.pdfIn PDF document text
    • http://bisikar.22web.org/14977106552.pdfIn PDF document text
    • http://olivamebel.com/57579410477sxqi1.pdfIn PDF document text
    • https://cdn.sqhk.co/zarepowake/lojgohc/sojusenojez.pdfIn PDF document text
    • https://cdn.sqhk.co/tememagitapo/ihjgcgf/98106420284.pdfIn PDF document text
    • http://fopijuzege.22web.org/86551460253.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://rimaxuj.rf.gd/caller_tune_song_wapking.pdfIn PDF document text
    • http://vedulojut.epizy.com/cleaning_employment_contract_template.pdfIn PDF document text
    • https://s3.amazonaws.com/lixisariwulo/kernel32._dll_windows_xp_free.pdfIn PDF document text
    • http://xumomevafuvozup.rf.gd/duxekolelezo.pdfIn PDF document text
    • https://s3.amazonaws.com/jinabisura/fatitewutime.pdfIn PDF document text
    • http://zanobunu.epizy.com/ebook_reader_android.pdfIn PDF document text
    • http://mirepili.epizy.com/application_loader_wizard_blackberry_8520_free.pdfIn PDF document text
    • http://gagonunanu.epizy.com/babemalujetowaf.pdfIn PDF document text
    • https://s3.amazonaws.com/minabiwa/arlington_ohio_weather_report.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_off00012f40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F40 5900 bytes
SHA-256: dc74dceeaee0dd93136198a67288d226e92ea492c15f6a169bc06d6f4dfe648f
font_01_sfnt_off00014343.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14343 10432 bytes
SHA-256: 65259d0b79603d6c862ebe247bb3a07e27da8190aebe69a3895418250b372501

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