Malicious PDF — malware analysis report

Static analysis result for SHA-256 f455e90c670e100d…

MALICIOUS

PDF

81.4 KB Created: 2021-04-20 09:02:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e919c52717836e428f34edca09b87b23 SHA-1: a5ba9e3e9d1625bccb7696700b5fac26320676f3 SHA-256: f455e90c670e100d705147dc89351aa9114293ee2d60346218c0ecf124ee7518
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many pointing to disposable domains and link farms, indicating a phishing or scam attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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=is+a+trane+xr14+good
    • http://pomirkapa.site/gipesavive70d.pdf
    • https://cdn.sqhk.co/menodotitit/cF4RhNn/weather_forecast_for_binghamton_new_york_tomorrow.pdf
    • https://pajejasebuwosiw.weebly.com/uploads/1/3/0/8/130813778/vaxudeb.pdf
    • http://nijeratazuw.iblogger.org/89152988575.pdf
    • http://idealicacolumbia.site/ortel_mobile_germany_internet_settingscmzhy.pdf
    • https://lekinowi.weebly.com/uploads/1/3/4/4/134476644/ce9c9.pdf
    • https://cdn.sqhk.co/denirinodo/ed9hbH8/pinball_free_download_for_windows_7.pdf
    • http://ellmax-site.xyz/zumujeregitemobokanz8tiz.pdf
    • http://rimka.xyz/dbt_worksheets_in_spanishkqrd1.pdf
    • http://tokio-2020.fun/wosomop93f81.pdf
    • https://werevofapopaja.weebly.com/uploads/1/3/4/4/134492388/xitewuwajijiviv-gojaraba-zevavuxer-misuxipifipevi.pdf
    • https://pezomivagijo.weebly.com/uploads/1/3/5/3/135392772/a0a82.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://f59c0a4d-c104-43ac-8966-a5978cdf1b8c.filesusr.com/ugd/0c1ebd_d72e8c24629b4bb494b1139a2933c5e8.pdf?index=true
    • http://tukorokibenej.epizy.com/praktijkboek_bouwbesluit.pdf
    • http://punipovudipani.rf.gd/volukovomaluneripa.pdf
    • http://tuwetixa.epizy.com/formatting_code_html_notepad.pdf
    • https://s3.amazonaws.com/lekizopiloref/pandora_s_box_game_windows_10.pdf
    • https://s3.amazonaws.com/tapelu/uppababy_vista_v2_stroller_hazel.pdf
    • https://s3.amazonaws.com/mosezavor/bd_result_hsc_2017_with_marksheet.pdf
    • https://61090d85-22e6-4724-b969-52a17785150c.filesusr.com/ugd/952c2e_44174661497b4522b2b18d000e0a7133.pdf?index=true
    • https://5e9816b5-e261-4a84-a5c7-594b6999e1c8.filesusr.com/ugd/eb2f7d_dc31172b178a46489bc97dc7667db50e.pdf?index=true
    • http://sabulawum.rf.gd/81650381075.pdf
    • https://s3.amazonaws.com/godoremitiwuja/wojuxafozobol.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fefc.bin
b328f213e41a1f1407c93ecf80edb9dc4b5e8666115a77e560bdc54e6d59e4db		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFEFC 5108 bytes
font_01_sfnt_off0001107b.bin
0faa0fe6e8a23b4b9dec58ad566e02ca550d1779f6b1c4c1e5fa9be0be8085c3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1107B 11752 bytes

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