Malicious PDF — malware analysis report

Static analysis result for SHA-256 cead40bfe189cf11…

MALICIOUS

PDF

80.2 KB Created: 2021-02-11 06:05:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: d6338ddfbcda1d025737c9f1f9234d3c SHA-1: 773a5f3cec462842f732ed4e4cc685cc5c0eda42 SHA-256: cead40bfe189cf1198eb73df5602ef0913b9a780ed000815e27a003cc7c73df1
126 Risk Score

Malware Insights

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

The PDF contains numerous external URLs, with many pointing to disposable hosting and employing UTM parameters, indicative of a link farm or phishing campaign. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://jacksth.ru/123?utm_term=north+korea+climate+facts PDF link annotation
    • https://cdn.sqhk.co/kisesawaropo/ugeNkDL/big_head_basketball_games_online_free.pdfIn PDF document text
    • http://temilops.xyz/avengers_theme_piano_notes_lettershqv2v.pdfIn PDF document text
    • https://cdn.sqhk.co/mukibusu/i34ijBO/bbq_restaurants_near_me_that_deliver.pdfIn PDF document text
    • http://rabevazilogu.iblogger.org/tiganivenuzibupivevewil.pdfIn PDF document text
    • http://omerkatanalp.com/enterprise_bargaining_agreement_template1d6ac.pdfIn PDF document text
    • http://reduslim-italiaofficial.site/aafco_pet_food_labeling_guideq4xfd.pdfIn PDF document text
    • http://rerubin.space/a_beginners_guide_to_day_trading_oni8c4a.pdfIn PDF document text
    • https://cdn.sqhk.co/xovikojux/igc0Nig/dynamons_world_2_mod_apk_hack.pdfIn PDF document text
    • http://pedalini.club/video_converter_for_android_phones_freeyfojx.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://giduzorim.epizy.com/tedikuluwujode.pdfIn PDF document text
    • http://wedalavunobuwe.rf.gd/90731261586.pdfIn PDF document text
    • http://rexawisoza.epizy.com/4571473106.pdfIn PDF document text
    • http://vetuvadoxawiton.epizy.com/wuwokomilitijevu.pdfIn PDF document text
    • https://s3.amazonaws.com/jowutoneranemuk/93289833475.pdfIn PDF document text
    • https://s3.amazonaws.com/xazarujokemus/dedadogovugudilovebopasef.pdfIn PDF document text
    • https://s3.amazonaws.com/pululusodogi/maintenance_work_order_template.pdfIn PDF document text
    • http://banugigo.epizy.com/jquery_ajax_form_validation_example_in_php.pdfIn PDF document text
    • http://bifajone.rf.gd/fategapagasinolatuf.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_off0000fd28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD28 5152 bytes
SHA-256: 722f8b937781712fbbc540f1edad5e5821496d980aaf37f5a9a85935b9ab3ec4
font_01_sfnt_off00010e8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E8E 10896 bytes
SHA-256: 05474fc3937f2bcf8896b528cdf722d898696a4088a397f3c9663ef64ffcb7c9

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