Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d1eaf7637eeac56…

MALICIOUS

PDF

111.1 KB Created: 2021-05-17 06:04:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: cee04c01e3de25e75eb7e7c546092ea2 SHA-1: 04c222b5f32aca83137bebfe1a16842b25f5bce9 SHA-256: 8d1eaf7637eeac56ae7b3eaab807c3d10d60ff5be4e5c94b88380c340d85ecce
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains, and is flagged by ML classifiers and ClamAV as malicious phishing content. The document body, though heavily obfuscated, contains a reference to 'Novela eva luna capitulo 100 youtube', suggesting a lure to attract users to click on the embedded links. The presence of multiple external URIs and the link farm heuristic indicate a strong intent to redirect users to potentially harmful 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://vilenefex.ru/strik?utm_term=novela+eva+luna+capitulo+100+youtube PDF link annotation
    • http://wivaserana.mywebcommunity.org/capacity_building_in_disaster_management.pdfIn PDF document text
    • http://popuririrow.iblogger.org/how_do_i_reset_my_samsung_galaxy_tab_4_to_factory_settings.pdfIn PDF document text
    • http://ritual-venki.online/missing_number_worksheets_free23ect.pdfIn PDF document text
    • http://biweekamnf.com/punadakiwiojnbx.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474752/normal_606e8332b0700.pdfIn PDF document text
    • http://xufededubumavif.scienceontheweb.net/parts_of_speech_sort_worksheet_answer_key.pdfIn PDF document text
    • http://magowowir.iblogger.org/chal_chaiyya_chaiyya_remix_song.pdfIn PDF document text
    • https://cdn.sqhk.co/kivipemo/hhjdhid/43068504625.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481424/normal_602aa72c15d5c.pdfIn PDF document text
    • https://cdn.sqhk.co/tirabipati/jqFiXle/mini_mini_mo_puzzle_adventure_games.pdfIn PDF document text
    • https://cdn.sqhk.co/ledusefugize/Ihe46jj/surveymonkey_allow_multiple_answers_to_multiple_choice.pdfIn PDF document text
    • http://ostanni.fun/25607760764ro7bt.pdfIn PDF document text
    • http://ro-shop.space/15770664316wwww3.pdfIn PDF document text
    • https://cdn.sqhk.co/motuwezelu/hjnhjhj/zexakoridemakawidaje.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/labitajaxatufib/90797357791.pdfIn PDF document text
    • http://tudixuzaw.onlinewebshop.net/tetete.pdfIn PDF document text
    • https://s3.amazonaws.com/tonemakopinibem/what_is_the_punishment_for_cyber_crime.pdfIn PDF document text
    • http://nekelaxowe.atwebpages.com/vagufigokitixopumoluwa.pdfIn PDF document text
    • http://misopipe.rf.gd/fovirolufokasobuxek.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_off00017055.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17055 5116 bytes
SHA-256: 3e967379346281d29070fcf6f2c6ed2a4ef9910c5878aa96bca7d7e5d4127dd5
font_01_sfnt_off000181e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x181E7 13576 bytes
SHA-256: 551a0ae4199ea5bac4d584dc1fac9b30b277d27dbd9698b640c51eb90b9ff251

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