Malicious PDF — malware analysis report

Static analysis result for SHA-256 84411f917f5ef9a1…

MALICIOUS

PDF

77.2 KB Created: 2021-03-22 15:11:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: a6e4f0dce533ea19f4ad42876643d234 SHA-1: 164488fb5c8f17425997867cecfd4183ae7e6c45 SHA-256: 84411f917f5ef9a1e4876b583fbefc6b5b3f0b2ec73d63a12840f4bc560bf48b
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 0.9996

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://jottigo.ru/strik?utm_term=english+grammar+test+quiz+with+answers PDF link annotation
    • https://cdn.sqhk.co/nexuliwadi/Fojbcsx/download_al_quran_malaysia.pdfIn PDF document text
    • http://limaxinsto.xyz/canon_powershot_a560_advanced_user_guide32w8k.pdfIn PDF document text
    • http://wspring.space/90_s_dance_music_ukhrxpt.pdfIn PDF document text
    • https://cdn.sqhk.co/dokukavifig/ghjjijA/37177513481.pdfIn PDF document text
    • https://cdn.sqhk.co/miloxuso/xRUgfNM/romanian_atomic_bomberman.pdfIn PDF document text
    • http://copyrightnotices-form.com/cunto_gana_un_ayudante_de_albail_en_mxicoip9yn.pdfIn PDF document text
    • https://cdn.sqhk.co/rizitewav/gfhajh3/oxygen_atomic_structure.pdfIn PDF document text
    • https://cdn.sqhk.co/nenuguvan/dijIXgd/44160335469.pdfIn PDF document text
    • http://3bki.ru/16762043114fztfp.pdfIn PDF document text
    • https://cdn.sqhk.co/potasuregoz/V3dzhhH/buvagege.pdfIn PDF document text
    • http://construt.site/bd_passport_application_formnekqf.pdfIn PDF document text
    • http://eglo.club/western_digital_my_cloud_software_for_macoy32i.pdfIn PDF document text
    • http://devlp.club/scansnap_s1300i_mac_mojavehamri.pdfIn PDF document text
    • http://hookup154.fun/spandana._ap._gov._in_application_form5ovo8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4474719/normal_5fee67916b99f.pdfIn PDF document text
    • http://useplafond.xyz/libros_de_economia_politica_para_secundariafctci.pdfIn PDF document text
    • https://cdn.sqhk.co/jigavozef/jicjBgc/cannon_shoot_game.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4472182/normal_603a779c5e780.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484641/normal_602c4e2fe4ed8.pdfIn PDF document text
    • http://thesimplycompleteseries.com/album_song_ringtone_newm5drp.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/pajeriramal/29700841073.pdfIn PDF document text
    • https://s3.amazonaws.com/vonuxagupeduze/vezijasanetotomimejivizu.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_off0000ee29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE29 5324 bytes
SHA-256: e5e7fc2621b76b0ea3c38dca8ae6934fe1529bdbcf148417a5e26ef563133d86
font_01_sfnt_off00010033.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10033 11484 bytes
SHA-256: 41c3c66c1a21d366293faef35c219b63092c8ecf0fd73b4a24175dca3547b46c

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