Malicious PDF — malware analysis report

Static analysis result for SHA-256 63a665989b5c1dfa…

MALICIOUS

PDF

80.8 KB Created: 2021-03-19 16:17:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: ac3bde49735eeae20d10a872873c259c SHA-1: 94d5946a941d9a238dc512e4a845cfb691224ebb SHA-256: 63a665989b5c1dfa19d9faa2c54a295b06852c76b6109f1e3d338b96ce31ea30
156 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 0.9967

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 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.
  • 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://crophysi.ru/award?keyword=classroom+language+for+teachers+pdf PDF link annotation
    • http://xubanapirobula.mypressonline.com/oxford_english_dictionary_free_download_full_version_for_windows_8.pdfIn PDF document text
    • http://vuvulusigi.scienceontheweb.net/cambridge_ielts_9_listening_test_3_questions.pdfIn PDF document text
    • https://cdn.sqhk.co/puxezuxivas/3hbhcYP/gisatibinerulikob.pdfIn PDF document text
    • https://cdn.sqhk.co/solijisivono/ie6jh4g/77209756635.pdfIn PDF document text
    • https://cdn.sqhk.co/gepeduvo/cjfjjjc/finoxodupe.pdfIn PDF document text
    • https://cdn.sqhk.co/wapadofiwe/5GDeqji/et_music_player_pro.pdfIn PDF document text
    • https://cdn.sqhk.co/vunofufi/Yhi2mMm/wuzizezox.pdfIn PDF document text
    • https://cdn.sqhk.co/kuwusemob/Cnjdbf2/international_marketing_notes.pdfIn PDF document text
    • https://cdn.sqhk.co/tawunipufop/APhdogj/game_emulator_ps1_android_terbaik.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/vovuzize/wordscapes_answers_level_124_arch_12.pdfIn PDF document text
    • https://s3.amazonaws.com/bidurudilidujug/isaimini_movies_in_tamil_2019.pdfIn PDF document text
    • https://s3.amazonaws.com/nitizobuv/migabezutubexo.pdfIn PDF document text
    • https://d04c2b29-3777-4fe6-aaa9-ab96f87c3324.filesusr.com/ugd/43eb95_779aac5751c44b1eab13e9dadf06eeda.pdf?index=trueIn PDF document text
    • http://litorow.myartsonline.com/folofogox.pdfIn PDF document text
    • https://s3.amazonaws.com/topipovikapari/zaworujirisejinenama.pdfIn PDF document text
    • https://s3.amazonaws.com/dorobukasawituw/19555594175.pdfIn PDF document text
    • https://b6de9e3f-c562-4e05-b5ee-70895c8060ae.filesusr.com/ugd/3801ff_2e2613921c434fb397efc01c1e1b1be6.pdf?index=trueIn PDF document text
    • https://3c86e5df-9a55-47dd-9d5b-c207b25ec6cd.filesusr.com/ugd/72bf36_289fb2ebe8e84f5db59a2ba5d60ef860.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/lemefofutomapox/52765054103.pdfIn PDF document text
    • https://s3.amazonaws.com/lezopobigeza/new_flight_simulator_2017_pc.pdfIn PDF document text
    • http://valupakukav.myartsonline.com/19221828406.pdfIn PDF document text
    • https://s3.amazonaws.com/xovajukoxin/outputstream_to_bitmap_android.pdfIn PDF document text
    • https://s3.amazonaws.com/bulalowisu/saber_si_imei_esta_reportado.pdfIn PDF document text
    • https://s3.amazonaws.com/gazivemon/zukutesebetiwozinekij.pdfIn PDF document text
    • https://05790d5e-93e9-4545-bcc4-99c37f081c18.filesusr.com/ugd/bff4d5_91680be8c11245f3b73a08882ce5a89a.pdf?index=trueIn PDF document text
    • https://e3e1c2aa-7f41-47b0-8c2f-d823cb48b857.filesusr.com/ugd/7598fa_801215697aea46b38e1162ffd342df03.pdf?index=trueIn 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fd32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD32 5476 bytes
SHA-256: 831a735e6c3ccd8889aef1178cff74be99c57cad9d2a33ba94c86ecd966dc21d
font_01_sfnt_off00010fa0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FA0 10812 bytes
SHA-256: 1f3e4a65567260fb5f9987e57d02aa3565d838ae8eec695cb85a3a61ca9e5e0f

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