Malicious PDF — malware analysis report

Static analysis result for SHA-256 83669eaa62e6d814…

MALICIOUS

PDF

83.2 KB Created: 2021-03-23 20:05:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: e8ab38f7a84cd88e745eb14d9faf2574 SHA-1: 2f6a3d9997c8a8ed5696aef2afc851229841e8e4 SHA-256: 83669eaa62e6d814dfcabfa28bd665e9943342bded0d40df1b9b503a3cb6b286
126 Risk Score

Malware Insights

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

The file is a PDF containing numerous embedded URLs, many of which point to disposable hosting and are likely part of a link farm designed to obscure malicious destinations. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically phishing or malware distribution. While no scripts were directly extracted, the PDF structure and embedded URIs suggest an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • 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/award?keyword=ace+academy+test+series+pdf+free+download PDF link annotation
    • http://xonibiz.22web.org/punjabi_vocal_samples_free.pdfIn PDF document text
    • http://pedaxofanor.mywebcommunity.org/nortel_networks_m3904_headset.pdfIn PDF document text
    • http://famekeletiti.iblogger.org/soriwikazuwesadapirutip.pdfIn PDF document text
    • http://tulomodev.getenjoyment.net/38303814550.pdfIn PDF document text
    • http://masuxolujetub.22web.org/unseen_comprehension_worksheets_for_grade_6.pdfIn PDF document text
    • https://cdn.sqhk.co/mujekesire/oggLfja/guess_the_wwe_superstar_name.pdfIn PDF document text
    • http://mikovil.mywebcommunity.org/surazep.pdfIn PDF document text
    • http://zugapuvu.mywebcommunity.org/neurofibromatosis_tipo_1_2020.pdfIn PDF document text
    • http://laludinemolat.sportsontheweb.net/safety_data_sheet_free_download.pdfIn PDF document text
    • https://cdn.sqhk.co/pozigafo/a7ghibW/lego_city_jungle_explorers_jungle_starter_set_60157.pdfIn PDF document text
    • http://tidirakozodawon.getenjoyment.net/causes_of_agricultural_pollution.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lofadekiwi.rf.gd/76070963039.pdfIn PDF document text
    • http://leronusofawu.epizy.com/how_to_use_a_rug_doctor_uk.pdfIn PDF document text
    • http://tarepos.onlinewebshop.net/bar_brothers_workout_program.pdfIn PDF document text
    • http://zejagal.rf.gd/bardale_fmt.pdfIn PDF document text
    • http://givoraxanusupe.rf.gd/la_vie_en_rose_uke.pdfIn PDF document text
    • http://luselobek.epizy.com/sharp_air_conditioner_portable_parts.pdfIn PDF document text
    • http://jumawivowibeb.onlinewebshop.net/dewiguzomefota.pdfIn PDF document text
    • http://tamafomuna.epizy.com/vokatulikinerepebalo.pdfIn PDF document text
    • http://jupilabezisetif.epizy.com/netflix_shows_onto_laptop.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_off0001085f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1085F 5484 bytes
SHA-256: 7ca5fda10f710d048855e61e43180c515081baddba11af314aa85e3e66d6ab2d
font_01_sfnt_off00011b0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B0B 10076 bytes
SHA-256: 598e5c88f65f7fdcd8705b03ff4a7070d5f3b429c2aec1338b7bf923c4f19413

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