Malicious PDF — malware analysis report

Static analysis result for SHA-256 397e10d535c6e55c…

MALICIOUS

PDF

107.3 KB Created: 2021-03-03 01:43:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: c9fb9111a079f19ff0d7f8b076d812cc SHA-1: a6d2b1b3750cdd2755a419603696bf8262409f97 SHA-256: 397e10d535c6e55c66b044af025781ffe94fa7906f69e63d9fd5c9cf746d77d0
134 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to disposable domains, suggesting a link farm designed to host malicious content or redirect users. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a malicious document designed to trick users into downloading further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=al+quran+only+bangla+mp3+free+download PDF link annotation
    • http://lodixewovufosa.iblogger.org/36050150411.pdfIn PDF document text
    • http://wimazosuwoxugij.66ghz.com/saaho_audio_songs_telugu_mp4.pdfIn PDF document text
    • http://jokidinavefo.22web.org/scale_grid_drawing_worksheets.pdfIn PDF document text
    • http://letilemugemin.66ghz.com/nitrogen_cycle_worksheet_activity.pdfIn PDF document text
    • https://cdn.sqhk.co/surixirulol/IgjgRhd/20995767258.pdfIn PDF document text
    • https://cdn.sqhk.co/ropimipaf/hiiejjm/kigokeberimuguzemipibawe.pdfIn PDF document text
    • http://sufawevugut.mywebcommunity.org/polytechnic_electrical_engineering_books_1st_year.pdfIn PDF document text
    • http://gukiduwonaxinef.getenjoyment.net/tekaxevufozixidezig.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/kofabube/41161043246.pdfIn PDF document text
    • http://lozopavo.rf.gd/l_anatomie_de_la_main.pdfIn PDF document text
    • http://tekunobujolid.epizy.com/how_much_does_lindamood_bell_program_cost.pdfIn PDF document text
    • http://vasedazixi.rf.gd/jeep_tj_frame_repair_near_me.pdfIn PDF document text
    • https://s3.amazonaws.com/tudawufed/dean_martin_sway_piano_sheet_music.pdfIn PDF document text
    • http://buwobazakosujo.rf.gd/dusexemubikizojume.pdfIn PDF document text
    • http://rilasiwawizumo.rf.gd/wuwifodob.pdfIn PDF document text
    • http://lewuxiboru.epizy.com/broderbund_calendar_creator_manual.pdfIn PDF document text
    • http://koxowasone.epizy.com/sabum.pdfIn PDF document text
    • http://bajupigirosinaf.atwebpages.com/tc_helicon_voicelive_2_firmware_update.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://www.geocities.com/mitra_anirban/hobbies.htmGNUIn PDF document text
    • http://www.gnu.org/copyleft/gpl.htmRegularIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_006_off00016b09.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x16B09 27564 bytes
SHA-256: ba6543f1190633db6a04b654d60a7e8cd58ed98c6a6efc390fe147e408617d9b
font_00_sfnt_off000113cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113CF 5796 bytes
SHA-256: e718cef7413abf864068d96c4df817d8d40107bb85e3599b5ad44f8e1a0192a9
font_01_sfnt_off00012787.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12787 10712 bytes
SHA-256: 85e476e7aadc4fa9a7555c0f0783ef747b874e4e665c3edfb2f632c743e09692
font_02_sfnt_off00014845.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14845 10068 bytes
SHA-256: 288d88077027dc428e8170acb0f23bb1c941996c1eb571ef4a3775db4544ba75