Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb28a665aed8b1cf…

MALICIOUS

PDF

78.3 KB Created: 2021-05-10 20:53:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: a3668a2bccbdbe1897f48ae8841107cc SHA-1: de3c55f9f518606dc2a1a19afba2444a6da788b2 SHA-256: fb28a665aed8b1cf9330ea5c56226a6b1b83a4c9270e62181516fdf33f048b97
126 Risk Score

Malware Insights

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

The PDF document contains embedded URLs and heuristics indicate it is a link farm designed to redirect users to potentially malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of an attempt to exploit users through deceptive content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://jumiwimov.ru/strik?utm_term=music+for+sight+singing+9th+edition PDF link annotation
    • http://winfreeiphone.xyz/gopesosowfqhp.pdfIn PDF document text
    • https://cdn.sqhk.co/vipujitebiki/ThfFShf/bloons_td_6_unlimited_monkey_money_apk.pdfIn PDF document text
    • http://affilateapp.online/dibujogetuparafeocz1g.pdfIn PDF document text
    • http://tevfikyuce.xyz/south_african_national_antiretroviral_treatment_guidelinesws1fk.pdfIn PDF document text
    • https://cdn.sqhk.co/zixapegof/fRDigFa/51224360215.pdfIn PDF document text
    • http://serovakarara.mygamesonline.org/acselerator_quickset_manual.pdfIn PDF document text
    • http://nosinoski.shop/how_to_learn_python_for_beginners_free7zjqz.pdfIn PDF document text
    • http://sadinexiwa.mygamesonline.org/arifureta_novela_ligera_espaol.pdfIn PDF document text
    • http://bomaduworofa.medianewsonline.com/how_do_you_become_a_certified_veterinary_technician.pdfIn PDF document text
    • http://devedilazabu.medianewsonline.com/asian_history_textbook.pdfIn PDF document text
    • https://cdn.sqhk.co/tovisegag/aihcjaH/wajunikabolebenebexibetem.pdfIn PDF document text
    • http://select-get.top/how_to_stop_my_tv_speakers_from_buzzinggoo57.pdfIn PDF document text
    • http://f13x.xyz/skywalker_trampoline_15_round_replacement_frame_parts_top_tubeoho0t.pdfIn PDF document text
    • https://cdn.sqhk.co/pawapoma/cH7jjjc/tomazapa.pdfIn PDF document text
    • https://cdn.sqhk.co/tedalome/nrigijT/zombie_army_dead_war_4_wiki.pdfIn PDF document text
    • http://dunotap.iblogger.org/80692880209.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://nokivegodixisi.rf.gd/what_is_working_class_family.pdfIn PDF document text
    • http://bitenozof.atwebpages.com/article_about_fashion_trends.pdfIn PDF document text
    • http://bozivexaterem.epizy.com/loyalty_program_terms_and_conditions_template.pdfIn PDF document text
    • http://wafuzujutine.rf.gd/rakutokojovufikupiratis.pdfIn PDF document text
    • http://nowivopikuzud.epizy.com/format_css_file_in_vs_code.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_off0000e967.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE967 5084 bytes
SHA-256: e07e6ac6a101fa1611f06d3e592ade3c56493106d78fca92711d3181d3bdac70
font_01_sfnt_off0000faaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAAF 10360 bytes
SHA-256: f126446b1423420be10840093f2ad9bf56fec762772815065826fb0823e94f6d
font_02_sfnt_off00011db1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DB1 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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