Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9743e2d6e5627d0…

MALICIOUS

PDF

87.5 KB Created: 2021-03-10 12:02:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 86051006294732402e5d026f6726bc0c SHA-1: 01a402fe1c4ffcda740108c2da4fb0c450f9116d SHA-256: f9743e2d6e5627d0ee21b6c91c82659c4f7c022f4b599f0b1c99609e75bccafe
126 Risk Score

Malware Insights

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

The PDF file contains embedded URLs and is flagged by ClamAV as 'Pdf.Phishing.Trojan'. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the PDF is part of a link farm designed to attract traffic, and one of the extracted URLs, 'https://pelibifir.ru/aws?utm_term=game+of+thrones+summary+season+2+episode+1', is likely the malicious payload delivery point. The document body, though heavily obfuscated, contains text related to 'Game of Thrones' and the authoring application 'wkhtmltopdf', suggesting a lure to a phishing or malware distribution site.

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://pelibifir.ru/aws?utm_term=game+of+thrones+summary+season+2+episode+1 PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4418590/normal_5feef19b2d2b7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4490273/normal_5fe317cb0ec4a.pdfIn PDF document text
    • https://fufuwotasivixi.weebly.com/uploads/1/3/5/9/135966690/werupaso-gabulevofaral-moxikutu.pdfIn PDF document text
    • http://rozogididibusar.sportsontheweb.net/the_elements_of_statistical_learning.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482847/normal_600e54dbe4dd3.pdfIn PDF document text
    • https://wolaserirefuf.weebly.com/uploads/1/3/1/6/131637046/8869065.pdfIn PDF document text
    • http://peuer.xyz/barito_pacific_annual_report3dxgp.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481509/normal_6011820feb9ce.pdfIn PDF document text
    • http://zoompol.xyz/dnd_taldorei_campaign_settingijhx5.pdfIn PDF document text
    • http://psyhologrzn.ru/pusobesulfhv.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4377115/normal_5fe1599d962a7.pdfIn PDF document text
    • http://digitalmicroteter.xyz/ways_to_watch_shows_with_friends_onlineiw2by.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://zagafelegaxo.epizy.com/english_learning_course_online_quora.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c8303b8b-e5bd-4e6e-8fcc-230ddba4e9c7/powerwise_36_volt_battery_charger_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/543223e1-ba4c-4c79-b695-b684d98dca85/jebax.pdfIn PDF document text
    • http://sasukagisodubex.onlinewebshop.net/stihl_fs_85_pro_carburetor_adjustment.pdfIn PDF document text
    • http://boripodadup.epizy.com/9154672107.pdfIn PDF document text
    • http://keregimuw.onlinewebshop.net/machine_learning_prediction_models_python.pdfIn PDF document text
    • http://webubekesivamuf.epizy.com/basomif.pdfIn PDF document text
    • http://titugol.atwebpages.com/defipatukuliwe.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_off00010a8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A8D 5448 bytes
SHA-256: 824f34e485779f00c6c16082fc5b8c8c6ef3d27cfb134e781f9740bd888c8892
font_01_sfnt_off00011d05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D05 10388 bytes
SHA-256: 22d49828795333f633e6665d358701aa58ff7e8c02f046ee513431f2c765cd87
font_02_sfnt_off00014065.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14065 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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