Malicious PDF — malware analysis report

Static analysis result for SHA-256 505b6c6e570a4c9b…

MALICIOUS

PDF

186.9 KB Created: 2021-04-25 19:23:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 56331c8e84e521949df796afe03f2f8a SHA-1: 28d23e409daef79ae6ca96ba97b6002ab43655b2 SHA-256: 505b6c6e570a4c9b38991443ae76d9a13ba41d90623515dc7e627a4d3129217c
126 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to disposable domains, suggesting a link farm or phishing attempt. The ML classifier and ClamAV both flagged this PDF as malicious, specifically as a phishing trojan. The presence of embedded URLs and the heuristic identifying it as a link farm on disposable hosting indicate a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://bologen.ru/strik?utm_term=book+of+enoch+dead+sea+scrolls+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4482402/normal_60522c96655cc.pdfIn PDF document text
    • https://tevirilozarenov.weebly.com/uploads/1/3/2/6/132695732/1843156.pdfIn PDF document text
    • http://wumomotetidofe.getenjoyment.net/epson_v370_specifications.pdfIn PDF document text
    • http://zolepop.mypressonline.com/kamaxezazipedusobijuru.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368218/normal_602ad622ae9d5.pdfIn PDF document text
    • http://zuwazekanusur.mypressonline.com/discrete_probability_distribution_examples.pdfIn PDF document text
    • http://kapovulup.mywebcommunity.org/kujudiwoluxit.pdfIn PDF document text
    • https://duxegolukazokun.weebly.com/uploads/1/3/1/3/131398215/cd40f25f7f44df.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475397/normal_606939d517a49.pdfIn PDF document text
    • http://xevedudox.sportsontheweb.net/how_do_you_play_speech_breaker.pdfIn PDF document text
    • http://movawizaxaxato.mywebcommunity.org/43263117246.pdfIn PDF document text
    • https://kolijegidixut.weebly.com/uploads/1/3/1/3/131379325/wawusudidunabuxineg.pdfIn PDF document text
    • http://pufivuziviv.mypressonline.com/diablo_3_barbarian_build_leveling.pdfIn PDF document text
    • http://sutobep.getenjoyment.net/accounting_all_in_one_for_dummies_download.pdfIn PDF document text
    • http://zobabikox.medianewsonline.com/ernest_hemingway_cats.pdfIn PDF document text
    • http://mugukix.mygamesonline.org/77274709193.pdfIn PDF document text
    • http://rafupofamurawaf.mygamesonline.org/fisoroletora.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
    • https://s3.amazonaws.com/sowewazulejewi/91551661560.pdfIn PDF document text
    • https://s3.amazonaws.com/vanatul/ipod_shuffle_user_guide_1st_generation.pdfIn PDF document text
    • https://s3.amazonaws.com/befafuni/are_old_toy_cars_worth_money.pdfIn PDF document text
    • https://s3.amazonaws.com/vapite/esi_phone_system_not_working.pdfIn PDF document text
    • http://rijonitapadon.myartsonline.com/a_thousand_years_piano_sheet_music_free_easy.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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00024cf9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x24CF9 21696 bytes
SHA-256: 5ee1eab5cab4b3f0240ee3b4df5cae8a55017dd1700410f65c18fa8e493498e5
font_01_sfnt_off000287ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x287AC 5016 bytes
SHA-256: 4313074d391fe20a327bd8c6e53ba547e99122adc9573db31410010890e7bb34
font_02_sfnt_off000298a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x298A9 18236 bytes
SHA-256: 46be184330716d1b0586ea51b07a6e888442b2ce76405b761be4a6068b5a0d93
font_03_sfnt_off0002ceb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2CEB8 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34