Malicious PDF — malware analysis report

Static analysis result for SHA-256 a34bb0d064357a79…

MALICIOUS

PDF

73.6 KB Created: 2021-02-24 07:44:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: c3d5398af55d649047645c731663fe49 SHA-1: c23d5bdc634fdb8b4057a804bfd0cd2e9e58dcd9 SHA-256: a34bb0d064357a7929895d5b552bf2ca89ca8336431aa2165fd02fad2d479912
186 Risk Score

Malware Insights

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

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 0.9999

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://maypoin.ru/wix?keyword=eso+monster+trophy+list PDF link annotation
    • https://vixevugipun.weebly.com/uploads/1/3/5/3/135327752/bomavaw-kitugilodoj-tezuxobuz-jobafopugugap.pdfIn PDF document text
    • https://cdn.sqhk.co/ruzemesafe/hjbmbjh/ghetto_wallpaper_apk_2020.pdfIn PDF document text
    • http://lapuxuzogu.22web.org/fetiwumijona.pdfIn PDF document text
    • https://torevoxun.weebly.com/uploads/1/3/2/7/132712334/sijid_vijozujenexezar_witume.pdfIn PDF document text
    • http://xasusofeg.iblogger.org/data_handling_bar_graph_worksheets_grade_5.pdfIn PDF document text
    • http://supernefritroller.xyz/ean_13_barcode_maker3s5m2.pdfIn PDF document text
    • https://wetogukonitama.weebly.com/uploads/1/3/3/9/133997956/eb9b29f5.pdfIn PDF document text
    • https://vunivejo.weebly.com/uploads/1/3/4/2/134266425/8828399.pdfIn PDF document text
    • https://mimifutugeteze.weebly.com/uploads/1/3/0/8/130874087/db70bd4.pdfIn PDF document text
    • http://romigeguwapefi.22web.org/76884118080.pdfIn PDF document text
    • http://accueilcmb.com/sih_problem_statement_formatxyw0m.pdfIn PDF document text
    • https://cdn.sqhk.co/xejudawadoni/22igUhb/best_jio_recharge_plan_for_calling_only.pdfIn PDF document text
    • https://cdn.sqhk.co/sejiragidu/gApii93/flat_battery_live_wallpaper_promo_code.pdfIn PDF document text
    • http://smeshnoykir.space/anatomia_para_el_movimiento_tomo_2thssr.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://mewizokefa.rf.gd/koputopip.pdfIn PDF document text
    • http://sudiwoke.epizy.com/60779608166.pdfIn PDF document text
    • http://woloruvikato.rf.gd/eclipse_java_for_mac_os_x.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_off0000d756.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD756 4908 bytes
SHA-256: c6bf20d005ae43a1f39a600a36a54ef4e25f2cb64fdcf74d99ce5012485e8a29
font_01_sfnt_off0000e7e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7E8 15976 bytes
SHA-256: 7912cb81ddd365e4b6412e3d7c04fab3368c1864ca9a19eee77d63febcd9c7b6

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