Malicious PDF — malware analysis report

Static analysis result for SHA-256 a712e9aaf2ef7955…

MALICIOUS

PDF

71.8 KB Created: 2021-04-07 09:41:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 9f3cc9ef6dff79877336f03a96e0a85a SHA-1: dc75f6f46aa88715aca4ab6c3934aa3ce71cce9b SHA-256: a712e9aaf2ef79559c9142eb64db7abb97f7cc1b212799aaaa8261354a1eddc6
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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://kuzutuzo.ru/123?utm_term=man+u+vs+arsenal+tv+guide PDF link annotation
    • https://cdn.sqhk.co/dodamewope/aBhhSXC/35950625218.pdfIn PDF document text
    • https://cdn.sqhk.co/sevijeruba/jBgejcA/helicopter_simulator_3d_game_apk_download.pdfIn PDF document text
    • http://rubyshup.space/40778812924q6j3.pdfIn PDF document text
    • http://ag-management.space/descargar_un_puente_hacia_terabithia_castellano_1080pwdcvp.pdfIn PDF document text
    • http://pixelbarista.com/wedonuzufovuxokamemexn5y.pdfIn PDF document text
    • http://taher-tcac.com/playerunknown_battlegrounds_cd_key_activation02ps4.pdfIn PDF document text
    • http://impergamon.com/surah_al_mulk_translation_englishh50hf.pdfIn PDF document text
    • http://opensoda.pro/62151568866t2qqp.pdfIn PDF document text
    • http://tasonilevibinu.22web.org/black_and_decker_single_serve_coffee_maker_instructions.pdfIn PDF document text
    • http://nakidki-alkantara.xyz/61441679448l43dy.pdfIn PDF document text
    • http://dontbeshy.xyz/bluestacks_mac_downloadv3b2k.pdfIn PDF document text
    • http://wildber.store/what_is_the_role_of_a_pr_managercn7kj.pdfIn PDF document text
    • http://hookup153.online/21607311404lmqyq.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376601/normal_6033f45f75b0a.pdfIn PDF document text
    • http://someduvudirebus.22web.org/linda_goodman_relationship_signs_free_download.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454968/normal_6064fcc5680b1.pdfIn PDF document text
    • https://cdn.sqhk.co/xolanikipiz/AvTXgeX/wordsearch_competition_2020.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sasugokomelu.rf.gd/ideas_for_landscaping_on_side_of_house.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_off0000dcb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCB0 5056 bytes
SHA-256: ae86abcf6ded689af99f3962cf631759c09eb9f6f9edfab15b576863851d100d
font_01_sfnt_off0000edfd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDFD 10988 bytes
SHA-256: b392757c4e9056f5689b219307d5b0c46d364a77ff7070cefc44f1cf16c03469

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