Malicious PDF — malware analysis report

Static analysis result for SHA-256 d32ce7d2d0ad015e…

MALICIOUS

PDF

75.3 KB Created: 2021-03-13 23:25:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 4e4f4d3f674c212228c1f4969f6401a5 SHA-1: fbef6866d936e1bf5a249dbf522e63f546d552e0 SHA-256: d32ce7d2d0ad015e0e3e79d7d4082fe3c0a143132c4fb490ed7febd486a7d4bf
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 0.9997

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://baarspo.ru/award?keyword=basics+of+civil+engineering+book+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4530937/normal_6039714f10258.pdfIn PDF document text
    • http://vumexovuvelafe.medianewsonline.com/2738120985.pdfIn PDF document text
    • https://cdn.sqhk.co/vobevufubito/1WDgdjc/note-_taking_strategies_for_students_with_learning_disabilities.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4391925/normal_5ff5d183728a9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404964/normal_60315e4545f81.pdfIn PDF document text
    • http://jitapikel.22web.org/airasia_group_berhad_annual_report_2016.pdfIn PDF document text
    • https://cdn.sqhk.co/jegetito/Rhfgcje/panujopumemisezos.pdfIn PDF document text
    • http://fukerijinexin.mygamesonline.org/55661517226.pdfIn PDF document text
    • http://bujenaro.scienceontheweb.net/ncert_mathematics_textbook_for_class_11_download.pdfIn PDF document text
    • https://cdn.sqhk.co/terodekijur/Wokgcje/nobide.pdfIn PDF document text
    • http://davupopebuwiser.sportsontheweb.net/no_matter_the_wreckage_free.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4472481/normal_5fca6e5d9ffd7.pdfIn PDF document text
    • http://kogudajinisu.iblogger.org/nespresso_machine_not_working_red_light.pdfIn PDF document text
    • https://cdn.sqhk.co/kisasizaro/rIGjdif/see_little_bright_spots_in_vision.pdfIn PDF document text
    • http://nosilekexiwot.mywebcommunity.org/wu_tang_clan_song_cream_lyrics.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xuvekixofeku.onlinewebshop.net/uscg_aeromedical_manual.pdfIn PDF document text
    • http://folujas.epizy.com/can_calibre_convert_to_kindle_format.pdfIn PDF document text
    • http://fopebuzab.epizy.com/community_medicine_mcq_with_answers.pdfIn PDF document text
    • http://belibivizonojo.myartsonline.com/how_to_clean_a_canon_ink_absorber.pdfIn PDF document text
    • http://gametasixomuk.epizy.com/the_shape_of_things_play_summary.pdfIn PDF document text
    • http://xumusuriwo.rf.gd/airtel_hello_tunes_free_online.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_off0000eb72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB72 5636 bytes
SHA-256: 82c6a87b37805418669012c381d495cf4d494794b09379c7b9377b9d51caa212
font_01_sfnt_off0000feb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEB3 9724 bytes
SHA-256: 07dbaf340fbd43306b4a23c6f6cb7958b3c03ef1ce248195ef7856d47590234d

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